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As filed with the Securities and Exchange Commission on August 11, 2008

Registration No. 333-152875

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

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POST EFFECTIVE AMENDMENT NO. 1
to
FORM S-3
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

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OCCIDENTAL PETROLEUM CORPORATION
(Exact name of registrant as specified in its charter)

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10889 Wilshire Boulevard
Los Angeles, California 90024
(310) 208-8800
(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

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Donald P. de Brier, Esq.
Executive Vice President, General Counsel and Corporate Secretary
Occidental Petroleum Corporation
10889 Wilshire Boulevard
Los Angeles, California 90024
(310) 208-8800
(Name, address, including zip code, and telephone number, including area code, of agent for service)

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Approximate date of commencement of proposed sale to the public: From time to time after this registration statement becomes effective.

         If the only securities being registered on this form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. o

         If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ý

         If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

         If this form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

         If this form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ý

         If this form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. o

         Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "larger accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

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CALCULATION OF REGISTRATION FEE

(1)

Not applicable pursuant to Form S-3 General Instruction II(E).

(2)

An indeterminate aggregate initial offering price of the senior debt securities is being registered as may from time to time be offered at indeterminate prices.

(3)

In accordance with Rule 456(b) and Rule 457(r), the registrant is deferring payment of the entire registration fee, except for $176,550 which was previously paid with respect to the $1,500,000,000 aggregate initial offering price of securities that were registered pursuant to Registration Statement No. 333-123324 that have not yet been issued and sold. Pursuant to Rule 457(p) under the Securities Act, such unutilized filing fee may be applied to the filing fee payable pursuant to this registration statement.

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Prospectus

OCCIDENTAL PETROLEUM CORPORATION

Senior Debt Securities

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        We may offer, issue and sell senior debt securities from time to time.

        We may offer and sell these senior debt securities to or through one or more underwriters, dealers and agents, or directly to purchasers, on a continuous or delayed basis.

        This prospectus describes some of the general terms that may apply to these senior debt securities. The specific terms of any senior debt securities to be offered will be described in a supplement to this prospectus. The prospectus supplement may also add, update or change information contained in this prospectus. You should read this prospectus and the applicable prospectus supplement carefully before you make your investment decision.

        Investing in our senior debt securities involves risks. See "Risk Factors" in our most recent annual report on Form 10-K, which is incorporated herein by reference, as well as in any of our subsequently filed quarterly or current reports that are incorporated herein by reference and any applicable prospectus supplement.

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        This prospectus may not be used to sell senior debt securities unless accompanied by a prospectus supplement.

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        Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus or the accompanying prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

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The date of this prospectus is August 11, 2008.

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TABLE OF CONTENTS

ABOUT THIS PROSPECTUS

        Unless otherwise stated or the context otherwise requires, the terms "Occidental," "we," "us," "our," and "the Company" refer to Occidental Petroleum Corporation and not any of our subsidiaries.

        This prospectus is part of a registration statement we filed with the Securities and Exchange Commission (the "SEC") using a "shelf" registration process. Under this shelf registration process, we may from time to time sell the senior debt securities described in this prospectus in one or more offerings.

        This prospectus describes some of the general terms that may apply to these senior debt securities. The specific terms of any senior debt securities to be offered will be described in a supplement to this prospectus. The prospectus supplement may also add, update or change information contained in this prospectus. You should read carefully this prospectus and the applicable prospectus supplement together with any additional information described under the heading "Where You Can Find More Information" before you make your investment decision.

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FORWARD-LOOKING STATEMENTS

        This prospectus, any accompanying prospectus supplement and the documents incorporated by reference herein and therein contain forward-looking statements and involve risks and uncertainties that could materially affect expected results of operations, liquidity, cash flows and business prospects. Factors that could cause results to differ materially include, but are not limited to:

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exploration risks such as drilling unsuccessful wells;



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global commodity pricing fluctuations;



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higher-than-expected costs;



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potential liability for remedial actions under existing or future environmental regulations and litigation;



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potential liability resulting from pending or future litigation;



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general domestic and international political conditions;



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potential disruption or interruption of our production or manufacturing facilities due to accidents, political events or insurgent activity;



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potential failure to achieve expected production from existing and future oil and gas development projects;



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the supply/demand considerations for our products;



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any general economic recession or slowdown domestically or internationally;



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changes in law or regulations;



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changes in tax law or regulations; and



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not successfully completing, or any material delay of, any development of new fields, expansion, capital expenditure, efficiency-improvement project, acquisition or disposition.

        Words such as "estimate," "project," "predict," "will," "would," "could," "may," "might," "anticipate," "plan," "intend," "believe," "expect" or similar expressions that convey the uncertainty of future events or outcomes generally indicate forward-looking statements. You should not place undue reliance on these forward-looking statements, which speak only as of the date of this prospectus or, in the case of documents incorporated by reference, as of the date of those documents. Unless legally required, we do not undertake any obligation to update any forward-looking statements, as a result of new information, future events or otherwise. Certain risks that may affect our results of operations and financial position appear under the heading "Risk Factors" and elsewhere in our most recent annual report on Form 10-K, which is incorporated herein by reference, as well as in any of our subsequently filed quarterly or current reports that are incorporated herein by reference and any applicable prospectus supplement.

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WHERE YOU CAN FIND MORE INFORMATION

        We file annual, quarterly and current reports, proxy statements and other information with the SEC. You may read and copy any document we file at the SEC's Public Reference Room at 100 F Street, N.E., Room 1580, Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the Public Reference Room. The SEC also maintains a website at www.sec.gov that contains reports, proxy statements and other information regarding issuers that file electronically with the SEC, including us. These reports, proxy statements and other information can also be read through the Investor Relations section of our website at www.oxy.com. Information on our website does not constitute part of this prospectus and should not be relied upon in connection with making any investment decision with respect to our securities.

        The SEC allows us to "incorporate by reference" the information that we file with the SEC. This permits us to disclose important information to you by referencing these filed documents. Any information referenced this way is considered part of this prospectus, and any information filed with the SEC subsequent to the date of this prospectus will automatically be deemed to update and supersede this information. We incorporate by reference the following documents which have been filed with the SEC:

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Annual Report on Form 10-K for the year ended December 31, 2007;



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Quarterly Reports on Form 10-Q for the quarters ended March 31, 2008 and June 30, 2008; and



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Current Reports on Form 8-K filed on January 29, 2008 (except for information appearing under Item 2.02 and related exhibits), April 17, 2008, April 24, 2008 (except for information appearing under Item 2.02 and related exhibits), May 23, 2008, July 22, 2008 and July 24, 2008 (except for information appearing under Item 2.02 and related exhibits).

        We also incorporate by reference all documents we may subsequently file with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 after the initial filing date of the registration statement of which this prospectus is a part and prior to the termination of the offering.

        Information furnished under Items 2.02 or 7.01 (or corresponding information furnished under Item 9.01 or included as an exhibit) in any past or future current report on Form 8-K that we file with the SEC, unless otherwise specified in such report, is not incorporated by reference in this prospectus.

        We will provide without charge upon written or oral request, a copy of any or all of the documents which are incorporated by reference to this prospectus. Requests should be directed to:

Occidental Petroleum Corporation
10889 Wilshire Boulevard
Los Angeles, California 90024
Attn: James R. Havert
Telephone: (310) 208-8800

        You should rely only on the information contained or incorporated by reference in this prospectus and any accompanying prospectus supplements and any applicable free writing prospectuses. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. The information contained or incorporated by reference in this prospectus is accurate only as of the date on the front cover of this prospectus, the information contained in any accompanying prospectus supplement or related free writing prospectus will be accurate only as of the date of that document, and the information contained in any document incorporated by reference in this prospectus is accurate only as the date of such document. Our business, financial condition, results of operations and prospects may have changed since that date.

        Except as provided above, no other information, including information on our internet site, is incorporated by reference in this prospectus.

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OCCIDENTAL

        We conduct our operations through three operating segments: (1) oil and gas, (2) chemical and (3) midstream, marketing and other activities. The oil and gas segment explores for, develops and produces crude oil, natural gas and natural gas liquids. The chemical segment manufactures and markets basic chemicals, vinyls and performance chemicals. The midstream, marketing and other activities segment gathers, processes, transports, stores and markets crude oil, natural gas, natural gas liquids and carbon dioxide production, and generates electricity at various facilities. Our principal executive offices are located at 10889 Wilshire Boulevard, Los Angeles, California 90024; telephone (310) 208-8800.

USE OF PROCEEDS

        The net proceeds we receive from the sale of senior debt securities, if any, offered under this prospectus may be used for general corporate purposes, including working capital, acquisitions, retirement of debt, stock repurchases and other business opportunities.

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RATIOS OF EARNINGS TO FIXED CHARGES

        The following table sets forth our total enterprise ratios of earnings to fixed charges based on our and our subsidiaries' historical results. For the purpose of calculating this ratio, earnings consist of income from continuing operations before income taxes (other than foreign oil and gas taxes) and fixed charges. Fixed charges include interest and debt expense, including the proportionate share of interest and debt expense of equity investments, and the portion of lease rentals representative of the interest factor. We did not have any preferred stock outstanding for the periods presented and, therefore, the ratios of earnings to combined fixed charges and preferred stock dividends would be same as the ratios of earnings to fixed charges presented below.

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DESCRIPTION OF SENIOR DEBT SECURITIES

General

        We may issue one or more series of senior debt securities pursuant to this prospectus. We may issue the senior debt securities under the senior indenture, dated as of April 1, 1998 (the "Senior Indenture"), between us and The Bank of New York Mellon Trust Company, N.A., as successor to The Bank of New York, as trustee ("Senior Indenture Trustee"). The Senior Indenture is incorporated by reference as an exhibit to the registration statement of which this prospectus is a part.

        Below is a description of certain general terms of the senior debt securities. The description is not complete and is subject to and qualified in its entirety by reference to the Senior Indenture. The particular terms of a series of senior debt securities will be described in a prospectus supplement and, if applicable, a pricing supplement. Capitalized terms used but not defined in this summary have the meanings specified in the Senior Indenture.

        The senior debt securities will rank equally with all of our senior and unsubordinated debt. The Senior Indenture is subject to the Trust Indenture Act of 1939, as amended (the "Trust Indenture Act"). The Senior Indenture does not limit the amount of senior debt securities which we may issue, nor does it limit us or our subsidiaries from issuing any other debt.

        Each prospectus supplement, together with a pricing supplement, if applicable, will describe the terms relating to a series of senior debt securities, which may include:

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the title;



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any limit on the amount that may be issued;



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whether or not that series of senior debt securities will be issued as registered securities, bearer securities or both;



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the price at which that series of senior debt securities will be issued, which may be at a discount;



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whether or not that series of senior debt securities will be issued in global form, the terms and who the depositary will be;



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the maturity date(s) or the method of determining the maturity date(s);



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the person to whom any interest will be payable on any registered security, if other than the person in whose name that security is registered at the close of business on the regular record date;



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the interest rate(s), if any, (which may be fixed or variable) or the method for determining the rate(s) and the date(s) interest will begin to accrue, the date(s) interest will be payable and the regular record date(s) for interest payment date(s);



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the place(s) where payments shall be payable, registered securities may be surrendered for registration of transfer, securities may be surrendered for exchange, and notices and demands to or upon us may be served;



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the period(s) within which, and the price(s) at which, that series of senior debt securities may, pursuant to any optional or mandatory redemption provisions, be redeemed, in whole or in part, and other related terms and conditions;



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any mandatory or optional sinking fund provisions or any provisions for remarketing that series of senior debt securities and other related terms and provisions;

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the denominations in which that series of senior debt securities will be issued, if other than denominations of $1,000 in the case of registered securities and any integral multiple thereof, and in the case of bearer securities, if other than denominations of $5,000 and $100,000;



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the currency or currencies, including composite currencies or currency units, in which that series of senior debt securities may be denominated or in which payment of the principal of and interest on, if any, that series of senior debt securities shall be payable, if other than the currency of the United States of America, and, if so, whether that series of senior debt securities may be satisfied and discharged other than as provided in Article Four of the Senior Indenture;



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if the amounts of payments of principal of and interest on, if any, that series of senior debt securities are to be determined by reference to an index, formula or other method, or based on a coin or currency other than that in which that series of senior debt securities are stated to be payable, the manner in which such amounts shall be determined and the calculation agent, if any, with respect thereto;



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if other than the principal amount thereof, the portion of the principal amount of that series of senior debt securities that will be payable upon declaration of acceleration of the maturity thereof pursuant to an event of default;



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whether we will pay additional amounts on any of the senior debt securities and coupons, if any, of the series to any non-United States holder in respect of any tax, assessment or governmental charge withheld or deducted, and under what circumstances and with what procedures we will pay such additional amounts;



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if other than as defined in the Senior Indenture, the meaning of "Business Day" when used with respect to that series of senior debt securities;



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if that series of senior debt securities may be issued or delivered (whether upon original issuance or upon exchange of a temporary security of such series or otherwise), or any installment of principal or interest is payable, only upon receipt of certain certificates or other documents or satisfaction of other conditions in addition to those specified in the Senior Indenture, the forms and terms of those certificates, documents or conditions;



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any addition to, or modification or deletion of, any event of default, covenant or other term or provision specified in the Senior Indenture with respect to that series of senior debt securities; and



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any other terms (which terms may be inconsistent with the Senior Indenture).

        Each prospectus supplement or pricing supplement, as applicable, may describe certain United States federal income tax considerations applicable to the purchase, holding and disposition of the senior debt securities that the prospectus supplement or pricing supplement covers, as applicable.

Limitation on Liens

        We will not, nor will we permit any Consolidated Subsidiary (as defined below), to incur, create, assume, guarantee or otherwise become liable with respect to any Secured Debt (as defined below), unless the senior debt securities are secured equally and ratably with (or prior to) such Secured Debt. This covenant will not apply to:

        (1)   Liens (as defined below) existing on the date of the Senior Indenture;

        (2)   Liens existing on property of, or on any shares of stock or Indebtedness (as defined below) of, any corporation at the time such corporation becomes a Consolidated Subsidiary;

        (3)   Liens in favor of us or a Consolidated Subsidiary;

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        (4)   Liens in favor of governmental bodies to secure progress, advance or other payments pursuant to any contract or provision of any statute;

        (5)   Liens existing on property, shares of stock or Indebtedness at the time of acquisition thereof (including acquisition through merger or consolidation) or Liens to secure the payment of all or any part of the purchase price thereof or the cost of construction, installation, renovation, improvement or development thereon or thereof or to secure any Indebtedness incurred prior to, at the time of, or within 360 days after the later of the acquisition, completion of such construction, installation, renovation, improvement or development or the commencement of full operation of such property or within 360 days after the acquisition of such shares or Indebtedness for the purpose of financing all or any part of the purchase price or cost thereof; and

        (6)   certain extensions, renewals or refundings of any Liens referred to in the foregoing clauses (1) through (5).

        Notwithstanding the foregoing, we and one or more Consolidated Subsidiaries may incur, create, assume, guarantee or otherwise become liable with respect to Secured Debt that would otherwise be subject to the foregoing restrictions if, after giving effect thereto, the aggregate amount of all Secured Debt, together with the Discounted Rental Value (as defined below) in respect of sale and leaseback transactions subject to the restrictions discussed in the following paragraph (excluding sale and leaseback transactions exempted from such restrictions pursuant to clause (1) or (2) of the last sentence of such paragraph), would not exceed 10% of consolidated Net Tangible Assets (as defined below) of us and our Consolidated Subsidiaries.

Limitations on Sale and Leaseback Transactions

        We will not, nor will we permit any Consolidated Subsidiary to, sell and lease back any Principal Domestic Property (as defined below) unless:

        (1)   the sale has occurred within 360 days after the later of the acquisition, completion of construction or commencement of full operations of the Principal Domestic Property;

        (2)   we or such Consolidated Subsidiary could subject such Principal Domestic Property to a Lien pursuant to the provisions described above under "—Limitation on Liens" in an amount equal to the Discounted Rental Value with respect to the sale and leaseback transaction without equally and ratably securing the senior debt securities; or

        (3)   we or such Consolidated Subsidiary, within 120 days after such sale, applies or causes to be applied to the retirement of our or its Funded Debt (as defined below) an amount (subject to credits for certain voluntary retirements of Funded Debt) not less than the greater of (a) the net proceeds of the sale of the Principal Domestic Property leased pursuant to such arrangement or (b) the fair value (as determined in any manner approved by our Board of Directors) of the Principal Domestic Property so leased.

        This restriction will not apply to any sale and leaseback transaction (1) between us and a Consolidated Subsidiary or between Consolidated Subsidiaries or (2) involving the sale or transfer of any Principal Domestic Property with a lease for a period, including renewals, of not more than three years.

Certain Definitions

        "Consolidated Subsidiary" means any Subsidiary included in our and our Subsidiaries' financial statements prepared on a consolidated basis in accordance with generally accepted accounting principles.

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        "Current Liabilities" means all Indebtedness that may properly be classified as current liabilities in accordance with generally accepted accounting principles.

        "Discounted Rental Value" means, as to any particular lease under which any Person is at the time liable and at any date as of which the amount thereof is to be determined, the total net amount of rent (after deducting the amount of rent to be received by such Person under noncancelable subleases) required to be paid by such Person under such lease during the remaining noncancelable term thereof (including any such period for which such lease has been extended or may, at the option of the lessor, be extended), discounted from the respective due dates thereof to such date at a rate per annum of 11³/4%. The net amount of rent required to be paid under any such lease for any such period shall be the aggregate amount of the rent payable by the lessee with respect to such period, after excluding amounts required to be paid on account of maintenance and repairs, insurance, taxes, water rates and similar charges. In the case of any lease which is terminable by the lessee upon the payment of a penalty, such net amount shall also include the amount of such penalty, but no rent shall be considered as required to be paid under such lease subsequent to the first date upon which it may be so terminated. If and to the extent the amount of any rent during any future period is not definitely determinable under the lease in question, the amount of such rent shall be estimated in such reasonable manner as our Board of Directors may in good faith determine.

        "Funded Debt" means all Indebtedness maturing one year or more from the date of the creation thereof, all Indebtedness directly or indirectly renewable or extendible, at the option of the debtor, by its terms or by the terms of any instrument or agreement relating thereto, to a date one year or more from the date of the creation thereof, and all Indebtedness under a revolving credit or similar agreement obligating the lender or lenders to extend credit over a period of one year or more, even though such Indebtedness may also conform to the definition of Short-Term Borrowing.

        "Indebtedness" as applied to a Person, means, as of the date on which Indebtedness is to be determined (a) all items (except items of capital stock or of surplus or of deferred credits or minority interest in Subsidiaries) which, in accordance with generally accepted accounting principles in effect from time to time, would be included in determining total liabilities, as shown on the liability side of a balance sheet of such Person; (b) all indebtedness secured by any mortgage on any property or asset owned or held by such Person subject thereto, whether or not the indebtedness secured thereby has been assumed; and (c) all indebtedness of others which such Person has directly or indirectly guaranteed, endorsed (otherwise than for collection or deposit in the ordinary course of business), discounted with recourse, agreed (contingently or otherwise) to purchase or repurchase or otherwise acquire, or in respect of which such Person has otherwise become directly or indirectly liable. For purposes of computing Indebtedness of any Person, there shall be excluded any particular Indebtedness which meets one or more of the following categories:

        (i)    Indebtedness with respect to which sufficient cash or cash equivalents or securities have been deposited in trust to provide for the full payment, redemption or satisfaction of the principal of, premium, if any, and interest to accrue on, such Indebtedness to the stated maturity thereof or to the date of prepayment thereof, as the case may be, and, as a result of such deposit, such particular Indebtedness, in accordance with generally accepted accounting principles, is no longer required to be reported on a balance sheet of such Person as a liability, and such cash or cash equivalents or securities are not required to be reported as an asset;

        (ii)   Indebtedness which is not classified as Indebtedness under clause (a) of this definition and which arises from any commitment of such Person relating to pipeline operations to pay for property or services substantially without regard to the non-delivery of such property or the non-furnishing of such services; or

        (iii)  Indebtedness which is not classified as Indebtedness under clause (a) of this definition and which is payable solely out of certain property or assets of such Person, or is secured by a

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mortgage on certain property or assets owned or held by such Person, in either case without any further recourse to or liability of such Person, to the extent such Indebtedness exceeds (x) if such Person records such property or assets on its books, the value for such property or assets recorded on such books or (y) if such Person does not record such property or assets on its books, (1) if such Indebtedness is a general obligation of the entity which does record such property or assets on its books, the net investment in or advances to such entity as recorded on the books of such Person or (2) if such Indebtedness is payable solely out of certain property or assets of such entity, the lesser of the value for such property or assets recorded on the books of such entity or the net investment in or advances to such entity as recorded on the books of such Person, in each case determined in accordance with generally accepted accounting principles.

        "Lien" means and includes any mortgage, pledge, lien, security interest, conditional sale or other title retention agreement or other similar encumbrance to secure Indebtedness for borrowed money but excluding any security interest which a lessor may be deemed to have under a lease and any lien which may be deemed to exist under a Production Payment or under any subordination arrangement.

        "Net Tangible Assets" of any specified Person means the total of all assets properly appearing on a balance sheet of such Person prepared in accordance with generally accepted accounting principles, after deducting from such total, without duplication of deductions, (1) all Current Liabilities of such Person; (2) that portion of the book amount of all such assets which would be treated as intangibles under generally accepted accounting principles, including, without limitation, all such items as goodwill, trademarks, trade names, brands, copyrights, patents, licenses and rights with respect to the foregoing and unamortized debt discount and expense; and (3) the amount, if any, at which any stock of such Person appears on the asset side of such balance sheet.

        "Person" means any individual, corporation, partnership, limited liability company, joint venture, association, joint-stock company, trust, unincorporated organization or government or any agency or political subdivision thereof.

        "Principal Domestic Property" means any (1) developed oil or gas producing property or (2) processing or manufacturing plant, in each case which we or any Consolidated Subsidiary own or lease as of the date of the Senior Indenture or thereafter and which is located in the continental United States (provided, however, that any such property or plant declared by our Board of Directors by board resolution not to be of material importance to our or our Consolidated Subsidiaries' business, taken as a whole, will be excluded from the foregoing definition).

        "Production Payment" means any economic interest in oil, gas or mineral reserves which (1) entitles the holder thereof to a specified share of future production from such reserves, free of the costs and expenses of such production, and (2) terminates when a specified quantity of such share of future production from such reserves has been delivered or a specified sum has been realized from the sale of such share of future production from such reserves.

        "Secured Debt" means any Indebtedness of us or any Consolidated Subsidiary, secured by a Lien on any Principal Domestic Property or on any shares of stock or on any Indebtedness of any Consolidated Subsidiary which owns any Principal Domestic Property.

        "Short-Term Borrowing" means all Indebtedness in respect of borrowed money maturing on demand or within one year from the date of the creation thereof and not directly or indirectly renewable or extendible, at the option of the debtor, by its terms or by the terms of any instrument or agreement relating thereto, to a date one year or more from the date of the creation thereof; provided that Indebtedness in respect of borrowed money arising under a revolving credit or similar agreement which obligates the lender or lenders to extend credit over a period of one year or more will constitute Funded Debt and not Short-Term Borrowing, even though it matures on demand or within one year from the date as of which such Short-Term Borrowing is to be determined.

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        "Subsidiary" means a corporation, association, partnership or other business entity more than 50% of the outstanding voting stock of which is owned, directly or indirectly, by us or by one or more of our other Subsidiaries, or by us and one or more of our other Subsidiaries. For the purposes of this definition, "voting stock" means stock which ordinarily has voting power for the election of directors or persons performing similar functions, whether at all times or only so long as no senior class of stock has such voting power by reason of any contingency.

Consolidation, Merger or Sale

        The Senior Indenture generally permits us to consolidate with, merge into or convey, transfer or lease our properties and assets substantially as an entirety, to any Person, so long as, immediately after giving effect to such transaction, no event of default under the Senior Indenture or event which, after notice or lapse of time or both, would become an event of default shall have occurred and be continuing. However, any successor or acquiror of such assets must assume all of our obligations under the Senior Indenture and the senior debt securities and be organized and existing under U.S. laws.

Events of Default Under the Senior Indenture

        The following are events of default under the Senior Indenture with respect to each series of senior debt securities issued:

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failure to pay any installment of interest upon any senior debt security of such series when it becomes due and payable, and continuance of such failure to pay for a period of 30 days; or



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failure to pay the principal of any senior debt security of such series when due;



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failure to perform or breach of any other covenant or warranty contained in the senior debt securities or the Senior Indenture (other than a covenant specifically benefiting only another series of senior debt securities), and the continuance of such failure for a period of 60 days after we receive notice from the Senior Indenture Trustee or holders of at least 25% in principal amount of the outstanding senior debt securities of that series;



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acceleration of more than $50,000,000 of our debt for borrowed money, without such debt having been discharged or such acceleration having been rescinded or annulled within a period of 20 days after we receive notice from the Senior Indenture Trustee or holders of at least 25% in principal amount of the outstanding senior debt securities of that series;



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certain events of bankruptcy, insolvency or reorganization relating to us; and



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any other event of default specified in the prospectus supplement or pricing supplement, if any, relating to that series of senior debt securities.

        If an event of default with respect to senior debt securities of any series occurs and is continuing, the Senior Indenture Trustee or the holders of at least 25% in principal amount of the outstanding senior debt securities of that series, by notice in writing to us (and to the Senior Indenture Trustee if notice is given by such holders), may declare the principal of (or if such senior debt securities are discount securities, the portion of the principal amount specified in the applicable prospectus supplement or pricing supplement, if any), and accrued interest, if any, due and payable immediately.

        The holders of a majority in principal amount of the outstanding senior debt securities of an affected series may waive any past default with respect to that series and its consequences, except defaults regarding:

•

payment of principal or interest; or

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•

covenants that cannot be modified or amended without the consent of the holder of each outstanding senior debt security of such series affected (as described under "—Modification of Senior Indenture; Waiver" below).

        Any waiver shall cure such default and the corresponding event of default.

        Subject to the terms of the Senior Indenture, the Senior Indenture Trustee will be under no obligation to exercise any of its rights or powers under the Senior Indenture at the request or direction of any of the holders of the applicable series of senior debt securities, unless the holders have offered the Senior Indenture Trustee reasonable security or indemnity. The holders of a majority in principal amount of the outstanding senior debt securities of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Senior Indenture Trustee, or exercising any trust or power conferred on the Senior Indenture Trustee, with respect to the senior debt securities of that series, provided that:

•

the direction given to the Senior Indenture Trustee is not in conflict with any law or the Senior Indenture;



•

the Senior Indenture Trustee may take any other action deemed proper by it which is not inconsistent with that direction; and



•

the Senior Indenture Trustee has not determined that the action would be unjustly prejudicial to the holders not involved in the proceeding.

        A holder of the senior debt securities of any series will have the right to institute a proceeding under the Senior Indenture or to appoint a receiver or trustee, or to seek other remedies only if:

•

the holder has given written notice to the Senior Indenture Trustee of a continuing event of default with respect to that series;



•

the holders of at least 25% in principal amount of the outstanding senior debt securities of that series have made written request to, and have offered reasonable indemnity to, the Senior Indenture Trustee to institute the proceedings as trustee; and



•

the Senior Indenture Trustee does not institute the proceeding, and does not receive from the holders of a majority in principal amount of the outstanding senior debt securities of that series other conflicting directions, within 60 days after the notice, request and offer of indemnity.

        The Senior Indenture provides that no holder or group of holders of senior debt securities will have any right to affect, disturb or prejudice the rights of other holders, obtain or seek priority or preference over another holder or enforce its rights under the Senior Indenture except as provided in the Senior Indenture for the equal and ratable benefit of all holders.

        These limitations do not apply to a suit instituted by a holder of senior debt securities if we default in the payment of the principal of or interest on the senior debt securities.

        We will periodically file statements with the Senior Indenture Trustee regarding our compliance with the conditions and covenants in the Senior Indenture.

Modification of Senior Indenture; Waiver

        We and the Senior Indenture Trustee may amend or supplement the Senior Indenture without the consent of any holders to, among other things:

•

evidence our succession by another person and the assumption by such person of our covenants in the Senior Indenture and the corresponding series of securities;



•

add to our covenants, agreements and obligations for the benefit of the holders of all senior debt securities or any series thereof, or to surrender any right or power the Senior Indenture confers upon us;

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•

evidence and provide for the acceptance of appointment under the Senior Indenture of a successor Senior Indenture Trustee with respect to the securities of one or more series;



•

cure any ambiguity or correct any inconsistency in the Senior Indenture or make other provisions with respect to matters or questions arising under the Senior Indenture;



•

add, change or eliminate any provisions of the Senior Indenture (which addition, change or elimination may apply to one or more series of senior debt securities), provided that the addition, change or elimination neither (a) applies to any security of any series created prior to the execution of the supplemental indenture that is entitled to the benefit of the provision nor (b) modifies the rights of holders of those securities with respect to those modified provisions;



•

secure the senior debt securities; or



•

change anything else that does not adversely affect the interests of any holder of senior debt securities.

        In addition, under the Senior Indenture, the rights of holders of a series of senior debt securities may be changed by us and the Senior Indenture Trustee with the written consent of the holders of at least a majority in principal amount of the outstanding senior debt securities of each series that is affected. However, no amendment or supplement may be made without the consent of the holder of each outstanding senior debt securities affected if such amendment or waiver would, among other things:

•

change the stated maturity of principal of, or any installment of principal or interest on, such senior debt securities;



•

reduce the principal amount of a discount security payable upon declaration of acceleration;



•

reduce the principal amount of, or the rate of interest on, or reduce any premium payable on, any of the senior debt securities;



•

change the place or currency of payment of principal or interest, if any, on any of the senior debt securities;



•

impair the right to institute suit for the enforcement of any payment on or with respect to any of the senior debt securities; and



•

modify any of the foregoing requirements or reduce the percentage of senior debt securities, the holders of which are required to consent to any amendment or waiver of any covenant or past default.

Form, Exchange and Transfer

        The senior debt securities of each series may be issued as registered securities, as bearer securities (with or without coupons) or both. Unless otherwise specified in the applicable prospectus supplement or the pricing supplement, if any, registered securities will be issued in denominations of $1,000 and any integral multiple thereof and bearer securities will be issued in denominations of $5,000 and $100,000. Subject to the terms of the Senior Indenture and the limitations applicable to global securities described in the applicable prospectus supplement or the pricing supplement, if any, registered securities will be exchangeable for other registered securities of the same series, in any authorized denomination and of like tenor and aggregate principal amount.

        Subject to the terms of the Senior Indenture and the limitations applicable to global senior debt securities set forth in the applicable prospectus supplement or pricing supplement, if any, senior debt securities issued as registered securities may be presented for exchange or for registration of transfer (duly endorsed or with the form of transfer duly executed) at the office of the registrar or at the office of any transfer agent we designate for that purpose. Bearer securities will not be issued in exchange for registered securities. Unless otherwise provided in the senior debt securities to be transferred or

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exchanged, no service charge will be made for any registration of transfer or exchange, but we may require payment of any taxes or other governmental charges. We have appointed the Senior Indenture Trustee as registrar. Any transfer agent (in addition to the registrar) initially designated by us for any senior debt securities will be named in the applicable prospectus supplement. We may at any time designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which any transfer agent acts, except that we will be required to maintain a transfer agent in each place of payment for the senior debt securities of each series.

        If the senior debt securities of any series are to be redeemed, we will not be required to:

•

issue, register the transfer of, or exchange any senior debt securities of, that series during a period beginning at the opening of business 15 days before any selection of senior debt securities for redemption and ending, in the case of registered securities, at the close of business on the day of mailing of the relevant notice of redemption and, in the case of bearer securities, the first publication date of the notice, or if the senior debt securities of that series are also issuable as registered securities and there is no publication, at the close of business on the day of mailing of the notice;



•

in the case of registered securities, register the transfer of or exchange any senior debt securities so selected for redemption, in whole or in part, except the unredeemed portion of any registered security being redeemed in part; or



•

in the case of bearer securities, exchange any senior debt securities so selected for redemption, except to exchange a bearer security for a registered security that is immediately surrendered for redemption.

Global Senior Debt Securities

        The senior debt securities of each series may be issued in whole or in part in global form. A senior debt security in global form will be deposited with, or on behalf of, a depositary, which will be named in an applicable prospectus supplement or pricing supplement, if any. A global senior debt security may be issued in either registered or bearer form and in either temporary or definitive form. A global senior debt security may not be transferred, except as a whole, among the depositary for that senior debt security and/or its nominees and/or successors. If any senior debt securities of a series are issuable as global senior debt securities, the applicable prospectus supplement or pricing supplement, if any, will describe any circumstances when beneficial owners of interests in that global senior debt security may exchange their interests for definitive senior debt securities of like series and tenor and principal amount in any authorized form and denomination, the manner of payment of principal of and interest, if any, on that global senior debt security and the specific terms of the depositary arrangement with respect to that global senior debt security.

Discharge

        Unless otherwise indicated in an applicable prospectus supplement or pricing supplement, if any, we may terminate at any time our obligations under the Senior Indenture with respect to any series of senior debt securities (other than certain limited obligations, such as the obligation to transfer and exchange senior debt securities of that series) by (1)(a) delivering all of the outstanding securities of that series to the Senior Indenture Trustee to be cancelled or (b) depositing with the Senior Indenture Trustee in trust funds or non-callable United States government or government-guaranteed obligations sufficient without reinvestment to pay all remaining principal and interest on the series of senior debt securities and (2) complying with selected other provisions of the Senior Indenture.

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        If we elect to discharge our obligations by depositing United States obligations as described above, that election under present law is likely to be treated for United States federal income tax purposes as a redemption of the senior debt securities of that series prior to maturity in exchange for the property deposited in trust. If so, each holder that acquired the senior debt securities on original issuance would generally recognize, at the time of discharge, gain or loss for United States federal income tax purposes measured by the difference between (1) the sum of (a) the amount of any cash and (b) the fair market value of any property deposited in trust deemed received by such holder (unless attributable to accrued interest) and (2) such holder's tax basis in the senior debt securities deemed surrendered. After the discharge, each such holder would be treated as if it held an undivided interest in the cash (or investments made therewith) and the property held in trust. Each such holder would generally be subject to tax liability in respect of interest income and original issue discount, if applicable, thereon and would recognize any gain or loss upon any disposition, including redemption, of the assets held in trust. Although tax might be owed, the holder of a discharged senior debt security would not receive cash (except for current payments of interest on that senior debt security) until the maturity or earlier redemption (or, if applicable, repurchase by us at the option of the holder) of that senior debt security. United States federal income tax treatment of this nature could affect the purchase price that a holder would receive upon the sale of the senior debt securities. You are urged to consult with your tax advisor regarding the tax consequences of the discharge of our obligations.

Information Concerning the Senior Indenture Trustee

        The Senior Indenture Trustee, other than during the occurrence and continuance of an event of default under the Senior Indenture, undertakes to perform only those duties as are specifically set forth in the Senior Indenture and, upon an event of default under the Senior Indenture, must use the same degree of care as a prudent person would exercise or use in the conduct of his or her own affairs. Subject to this provision, the Senior Indenture Trustee is under no obligation to exercise any of the rights or powers given it by the Senior Indenture at the request or direction of any holder of senior debt securities unless the Senior Indenture Trustee is offered reasonable security or indemnity by that holder against the costs, expenses and liabilities that it might incur. The Senior Indenture Trustee is not required to spend or risk its own money or otherwise become financially liable while performing its duties unless it reasonably believes that it will be repaid or receive adequate indemnity.

        The Bank of New York Mellon is a participating lender under our revolving credit agreement and provides commercial banking services to us and our affiliates. The Bank of New York Mellon Trust Company, N.A. is the Senior Indenture Trustee. However, if The Bank of New York Mellon Trust Company, N.A. acquires any conflicting interest when an event of default is pending, it must (with certain exceptions) eliminate the conflict or resign.

Payment and Payment Agents

        The person in whose name a senior debt security is registered will be treated as the owner of such security for the purpose of receiving payment of principal and, unless otherwise indicated in an applicable prospectus supplement or pricing supplement, if any, interest on such security and for all other purposes.

        Unless otherwise indicated in the applicable prospectus supplement or pricing supplement, if any, payment of interest on any senior debt securities (other than bearer securities) on any interest payment date will be made to the person in whose name those senior debt securities (or one or more predecessor securities) are registered at the close of business on the regular record date for the interest. Unless otherwise indicated in the applicable prospectus supplement or pricing supplement, if any, principal and interest on the senior debt securities of a particular series will be payable at the office of the paying agents that we designate, except that payments of interest (other than interest on bearer securities) may, at our option, be made by wire transfer or check mailed to the address of the

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person entitled thereto. Unless otherwise indicated in an applicable prospectus supplement or pricing supplement, if any, any payment of an installment of interest on any bearer security will be made only if the coupon relating to the interest installment is surrendered.

        We will be required to maintain a paying agent in each place of payment for the senior debt securities of a particular series. Unless otherwise indicated in the applicable prospectus supplement or pricing supplement, if any, the corporate trust office of the Senior Indenture Trustee in The City of New York will be designated as sole paying agent for payments with respect to senior debt securities (other than bearer securities). Unless otherwise indicated in an applicable prospectus supplement or pricing supplement, if any, payment of principal and interest, if any, on bearer securities will be made subject to any applicable laws and regulations, at the office of a paying agent outside the United States as we may designate.

        All moneys that we pay to a paying agent or the Senior Indenture Trustee for the payment of the principal or interest, if any, on any senior debt securities which remain unclaimed at the end of two years after that principal or interest has become due and payable will be repaid to us, and the holder of the security thereafter may look only to us for payment thereof.

        Unless otherwise indicated in an applicable prospectus supplement or pricing supplement, if any, interest shall be computed, for fixed rate securities, on the basis of a 360-day year comprised of twelve 30-day months, and, for variable rate securities, on the basis of the actual number of days in the interest period divided by 360.

Governing Law

        The Senior Indenture and senior debt securities will be governed by and construed in accordance with the laws of the State of New York, except to the extent that the Trust Indenture Act shall be applicable.

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PLAN OF DISTRIBUTION

        We may sell the senior debt securities being offered hereby in one or more of the following ways from time to time:

•

to underwriters or dealers for resale to the public or to institutional investors;



•

directly to institutional investors;



•

directly to agents;



•

directly to a limited number of purchasers or to a single purchaser;



•

through agents to the public or to institutional investors;



•

if indicated in the prospectus supplement, pursuant to delayed delivery contracts or by remarketing firms; or



•

through a combination of any of the previous methods of sale.

        The prospectus supplements and pricing supplements, if any, will set forth the terms of the offering of each series of senior debt securities, including the name or names of any underwriter, dealers or agents, the purchase price of the senior debt securities and the proceeds to us from such sale, any underwriting discounts or agency fees and other items constituting underwriters' or agents' compensation, any initial public offering price, any discounts or concessions allowed or reallowed or paid to dealers and any securities exchanges on which the senior debt securities may be listed.

        If underwriters or dealers are used in the sale, the senior debt securities will be acquired by the underwriters or dealers for their own account and may be resold from time to time in one or more transactions, including privately negotiated transactions, at a fixed public offering price or prices, which may be changed, in "at the market offerings" within the meaning of Rule 415(a)(4) of the Securities Act, at prices related to prevailing market prices or at negotiated prices or varying prices determined at the time of sale.

        Unless otherwise set forth in a prospectus supplement or a pricing supplement, if any, the obligations of the underwriters to purchase any series of senior debt securities will be subject to certain conditions precedent and the underwriters will be obligated to purchase all of the series of senior debt securities, if any are purchased.

        If a dealer is utilized in the sale of senior debt securities, we will sell the senior debt securities to the dealer, as principal. The dealer may then resell the senior debt securities to the public at varying prices to be determined by the dealer at the time of resale. The names of the dealers and the terms of the transaction will be set forth in the prospectus supplement relating to that transaction.

        Senior debt securities may also be offered and sold, if so indicated in the prospectus supplement or a pricing supplement, if any, in connection with a remarketing upon their purchase, in accordance with a redemption or repayment pursuant to their terms, or otherwise, by one or more firms ("remarketing firms") acting as principals for their own accounts or as agents for us. Any remarketing firm will be identified and the terms of its agreement, if any, with us and its compensation will be described in the prospectus supplement or a pricing supplement, if any.

        Underwriters, agents, dealers and remarketing firms may be entitled under agreements entered into with us to indemnification by us against certain civil liabilities, including liabilities under the Securities Act, or to contribution with respect to payments which the underwriters or agents may be required to make in respect thereof, and to reimbursement by us for certain expenses. Underwriters, agents, dealers and remarketing firms may be customers of, engage in transactions with, or perform services for us and our affiliates in the ordinary course of business.

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        Each series of senior debt securities will be a new issue of senior debt securities and will have no established trading market. Unless otherwise specified in the applicable prospectus supplement or pricing supplement, the senior debt securities will not be listed on a national securities exchange. Any underwriters to whom we sell senior debt securities for public offering and sale may make a market in those senior debt securities, but such underwriters will not be obligated to do so and may discontinue any market making at any time without notice.

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LEGAL MATTERS

        Unless otherwise specified in a prospectus supplement accompanying this prospectus, Linda S. Peterson, our Associate General Counsel, will provide opinions regarding the authorization and validity of the senior debt securities. Any underwriters will be advised about legal matters by their own counsel, which will be named in the prospectus supplement.

EXPERTS

        The consolidated financial statements and financial statement schedule of Occidental Petroleum Corporation and its subsidiaries as of December 31, 2007 and 2006, and for each of the years in the three-year period ended December 31, 2007, and management's assessment of the effectiveness of internal control over financial reporting as of December 31, 2007 have been incorporated by reference herein and in the registration statement in reliance upon the reports of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing. The audit report covering the December 31, 2007 consolidated financial statements refers to changes in accounting for uncertain tax positions, defined benefit pension and other postretirement plans and share-based payments.

        Ryder Scott Company, L.P., independent petroleum engineering consultants, reviewed Occidental's oil and gas estimation process, which review information is included in Occidental's Annual Report on Form 10-K for the year ended December 31, 2007, which is incorporated by reference in this prospectus. Ryder Scott's review information is incorporated by reference herein in reliance upon the authority of said firm in such matters.

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PART II
INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution.

        The following table sets forth the expenses, other than underwriting discounts and commissions, payable by us in connection with the sale of the securities being registered hereby.* All amounts are estimates.

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*

Since an indeterminate amount of securities is covered by this registration statement, the expenses in connection with the issuance and distribution of the securities are therefore not currently determinable. The amounts shown are estimates of expenses for a single offering of securities under this registration statement, but do not limit the amount of securities that may be offered.

**

Deferred in accordance with Rule 456(b) and 457(r) of the Securities Act.

Item 15. Indemnification of Directors and Officers.

        Section 145 of the Delaware General Corporation Law (DGCL) permits the board of directors of a corporation to indemnify any person against expenses (including attorneys' fees), judgments, fines and amount paid in settlement actually and reasonably incurred by him or her in connection with any threatened, pending or completed action, suit or proceeding in which such person is made a party by reason of his or her being or having been a director, officer, employee or agent of the registrant, as the case may be, in terms sufficiently broad to permit such indemnification under certain circumstances for liabilities (including reimbursement for expenses incurred) arising under the Securities Act of 1933, as amended (the Securities Act). The statute provides that indemnification pursuant to its provisions is not exclusive of other rights of indemnification to which a person may be entitled under any bylaw, agreement, vote of stockholders or disinterested directors, or otherwise.

        The registrant's Restated Certificate of Incorporation, as amended, provides that no director will be personally liable to the registrant or its stockholders for monetary damages for any breach of fiduciary duty by such director as a director; provided that a director will be liable to the extent provided by applicable law for breach of the director's duty of loyalty to the registrant or its stockholders, for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation or law, pursuant to Section 174 of the DGCL or for any transaction from which the director derived an improper personal benefit. The registrant has entered into indemnification agreements with each director and certain officers providing for indemnification. Additionally, Article VIII of the registrant's Bylaws provides that the registrant will indemnify directors and officers under certain circumstances for liabilities and expenses incurred by reason of their activities in such capacities. In addition, the registrant has insurance policies that provide liability coverage to directors and officers while acting in such capacities.

        The directors and officers of the registrant are covered by insurance policies indemnifying against certain liabilities, including certain liabilities arising under the Securities Act, which might be incurred by them in such capacities.

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Item 16. Exhibits.

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*

To be filed by amendment or as an exhibit to a document to be incorporated or deemed to be incorporated by reference in the Registration Statement.

**

Previously filed.

Item 17. Undertakings.

        (a)   The undersigned registrant hereby undertakes:

        (1)   To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

        (i)    To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933, as amended (the "Securities Act");

        (ii)   To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of senior debt securities offered (if the total dollar value of senior debt securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Securities and Exchange Commission (the "Commission") pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20% change in the maximum aggregate offering price set forth in the "Calculation of Registration Fee" table in the effective registration statement; and

        (iii)  To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;

Provided, however, that paragraphs (a)(1)(i), (a)(1)(ii) and (a)(1)(iii) of this section do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange

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Act"), that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

        (2)   That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the senior debt securities offered therein, and the offering of such senior debt securities at that time shall be deemed to be the initial bona fide offering thereof.

        (3)   To remove from registration by means of a post-effective amendment any of the senior debt securities being registered which remain unsold at the termination of the offering.

        (4)   That, for the purpose of determining any liability under the Securities Act to any purchaser:

        (i)    Each prospectus filed by the undersigned registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and

        (ii)   Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

        (5)   That, for the purpose of determining any liability of the undersigned registrant under the Securities Act to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

        (i)    Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

        (ii)   Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;

        (iii)  The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

        (iv)  Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

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        (b)   The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the registrant's annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the senior debt securities offered therein, and the offering of such senior debt securities at that time shall be deemed to be the initial bona fide offering thereof.

        Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the senior debt securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

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SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, Occidental Petroleum Corporation certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this amendment to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Los Angeles, State of California, on August 11, 2008.

        Pursuant to the requirements of the Securities Act, this amendment to the Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

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Exhibit Index

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*

To be filed by amendment or as an exhibit to a document to be incorporated or deemed to be incorporated by reference in the Registration Statement.

**

Previously filed.

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TABLE OF CONTENTS
ABOUT THIS PROSPECTUS
FORWARD-LOOKING STATEMENTS
WHERE YOU CAN FIND MORE INFORMATION
OCCIDENTAL
USE OF PROCEEDS
RATIOS OF EARNINGS TO FIXED CHARGES
DESCRIPTION OF SENIOR DEBT SECURITIES
PLAN OF DISTRIBUTION
LEGAL MATTERS
EXPERTS
PART II INFORMATION NOT REQUIRED IN PROSPECTUS
SIGNATURES
Exhibit Index

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Exhibit 1.1

OCCIDENTAL PETROLEUM CORPORATION

FORM OF UNDERWRITING AGREEMENT

[Date]

Ladies and Gentlemen:

        Occidental Petroleum Corporation, a Delaware corporation (the "Company"), confirms its agreement with [insert names of lead underwriters] (collectively the "Underwriters," which term shall also include any underwriter substituted as hereinafter provided in Section 11 hereof) with respect to the issue and sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of the respective principal amounts set forth opposite their names on Schedule A hereto, of the Company's                                    (the "Notes"). The Notes are to be issued pursuant to an indenture, dated as of                                    (the "Indenture," which term, for purposes of this Agreement, shall include an Officers' Certificate or supplemental indenture with respect to the Notes delivered pursuant to Section 301 of the Indenture), between the Company and                                                                         , as trustee (the "Trustee").    •    and    •    shall be the representatives of the Underwriters (the "Representatives;" in the event that there is only one such representative, then all references herein to the "Representatives" shall be deemed to mean and refer to such single representative, mutatis mutandis).

        The Company has filed with the Securities and Exchange Commission (the "Commission") a registration statement on Form S-3 (No. 333-    •    ) and, if applicable, one or more amendments thereto, for the registration of, among other securities, debt securities, including the Notes, under the Securities Act of 1933, as amended (the "1933 Act"), and the offering thereof from time to time in accordance with Rule 415 of the rules and regulations of the Commission under the 1933 Act (the "1933 Act Regulations"). Such registration statement (as amended, if applicable), became effective upon filing with the Commission pursuant to Rule 462(e) of the 1933 Act Regulations, and the Indenture has been qualified under the Trust Indenture Act of 1939, as amended (the "1939 Act"). Such registration statement (as amended, if applicable) and the prospectus dated    •    (the "Base Prospectus") together with the final prospectus supplement dated    •    (the "Final Prospectus Supplement") filed by the Company relating to the Notes, including, in each case, all Incorporated Documents (as hereinafter defined) and, solely in the case of any such registration statement, the information that is deemed pursuant to Rule 430B of the 1933 Act Regulations to be part of such registration statement ("Rule 430B Information"), are referred to herein as the "Registration Statement" and the "Prospectus," respectively, except that, if any revised prospectus or prospectus supplement filed by the Company shall be provided to the Underwriters by the Company for use in connection with the offering of the Notes (including, without limitation, for delivery upon request of purchasers of Notes pursuant to Rule 173 of the 1933 Act Regulations), the term "Prospectus" shall refer to such revised prospectus or prospectus supplement, as the case may be, from and after the time it is first provided to the Underwriters for such use. As used herein, the term "preliminary prospectus" means any prospectus supplement filed by the Company relating to the Notes that is captioned "Subject to Completion" or "preliminary prospectus supplement" or that has a similar caption, together with the Base Prospectus, including all Incorporated Documents, it being understood that all references herein to a "preliminary prospectus" shall include, without limitation, the Statutory Prospectus (as defined below). Any reference herein to the Registration Statement, any preliminary prospectus or the Prospectus shall be deemed to refer to and include the documents, financial statements and schedules incorporated, or deemed to be incorporated, by reference therein (other than information in such documents, financial statements and schedules that is deemed not to be filed) pursuant to Item 12 of Form S-3 under the 1933 Act, and any reference to any amendment or supplement to the Registration Statement, any preliminary prospectus or the Prospectus shall be deemed to refer to and include any documents, financial statements and schedules filed by the Company with the Commission under the

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Securities Exchange Act of 1934, as amended (the "1934 Act") and so incorporated, or deemed to be incorporated, by reference (other than information in such documents, financial statements and schedules that is deemed not to be filed) (such incorporated documents, financial statements and schedules being herein called the "Incorporated Documents"). Notwithstanding the foregoing, for purposes of this Agreement any prospectus supplement prepared or filed with respect to an offering pursuant to the Registration Statement of any securities other than the Notes shall not be deemed to have supplemented any preliminary prospectus or the Prospectus and the information therein shall not be deemed Rule 430B Information. For purposes of this Agreement, all references to the Registration Statement, the Prospectus, or any preliminary prospectus, or to any Issuer Free Writing Prospectus, Issuer General Use Free Writing Prospectus or Issuer Limited Use Free Writing Prospectus (as such terms are hereinafter defined), or to any amendment or supplement to any of the foregoing shall be deemed to include any copy filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval system ("EDGAR").

        The Company understands that the Underwriters propose to make a public offering of the Notes as soon as the Underwriters deem advisable after this Agreement has been executed and delivered.

SECTION 1.    Representations and Warranties.

        (a)   The Company represents and warrants to each of the Underwriters as follows:

        (i)    (A) At the time of filing the Registration Statement, (B) at the time of the most recent amendment thereto for the purposes of complying with Section 10(a)(3) of the 1933 Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Section 13 or 15(d) of the 1934 Act or form of prospectus), (C) at the time the Company or any person acting on its behalf (within the meaning, for this clause only, of Rule 163(c) of the 1933 Act Regulations) made any offer relating to the Notes in reliance on the exemption of Rule 163 of the 1933 Act Regulations and (D) at the date hereof, the Company was or is (as the case may be) a "well-known seasoned issuer," as defined in Rule 405 of the 1933 Act Regulations ("Rule 405"), including not having been and not being an "ineligible issuer" as defined in Rule 405; the Registration Statement is an "automatic shelf registration statement," as defined in Rule 405, that initially became effective within three years of the date hereof; and the Company has not received from the Commission any notice pursuant to Rule 401(g)(2) of the 1933 Act Regulations objecting to the use of the automatic shelf registration statement form.

        At the earliest time after the filing of the Registration Statement that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) of the 1933 Act Regulations) of the Notes and at the date hereof, the Company was not and is not an "ineligible issuer," as defined in Rule 405, without taking account of any determination by the Commission pursuant to Rule 405 that it is not necessary that the Company be considered an "ineligible issuer."

        No stop order suspending the effectiveness of the Registration Statement has been issued under the 1933 Act and the Registration Statement is not the subject of a pending proceeding or examination under Section 8(d) or 8(e) of the 1933 Act and no proceedings for any such purpose have been instituted or are pending, or to the knowledge of the Company, are contemplated by the Commission, and the Company is not the subject of a pending proceeding under Section 8A of the 1933 Act in connection with the offering of the Notes.

        Any offer that is a written communication relating to the Notes made prior to the filing of the Registration Statement by the Company or any person acting on its behalf (within the meaning, for this paragraph only, of Rule 163(c) of the 1933 Act Regulations) has been filed with the Commission in accordance with the exemption provided by Rule 163 of the 1933 Act Regulations ("Rule 163") and otherwise complied with the requirements of Rule 163, including, without

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limitation, the legending requirement, to qualify such offer for the exemption from Section 5(c) of the 1933 Act provided by Rule 163.

        (ii)   The Incorporated Documents, when they were filed or became effective (or, if an amendment with respect to any such Incorporated Document was filed or became effective, when such amendment was filed or became effective) with the Commission, as the case may be, complied in all material respects with the requirements of the 1934 Act and the rules and regulations of the Commission under the 1934 Act (the "1934 Act Regulations"), and any Incorporated Documents filed subsequent to the date hereof and prior to the termination of the offering of the Notes, will, when they are filed with the Commission, comply in all material respects with the requirements of the 1934 Act and the 1934 Act Regulations; no such Incorporated Document, when it was filed or became effective (or, if an amendment with respect to any such Incorporated Document was filed or became effective, when such amendment was filed or became effective) with the Commission, contained, and no Incorporated Document filed subsequent to the date hereof and prior to the termination of the offering of the Notes will contain, an untrue statement of a material fact or omitted, or will omit, to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were or will be made, not misleading.

        (iii)  The Registration Statement, at the respective times the Registration Statement or any post-effective amendments thereto became effective, complied in all material respects with the provisions of the 1933 Act and the 1933 Act Regulations; at the date hereof and at each deemed effective date with respect to the Underwriters pursuant to Rule 430B(f)(2) of the 1933 Act Regulations, the Registration Statement and the Prospectus, and any supplement or amendment thereto relating to the Notes, complied and will comply in all material respects with the provisions of the 1933 Act and the 1933 Act Regulations and (a) the Registration Statement, and any such post-effective amendments thereto, at all such times did not and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading and (b) the Prospectus, and any such supplement or amendment thereto relating to the Notes, at all such times did not and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein, in the light of the circumstances under which they were or will be made, not misleading.

        As of the Applicable Time, neither (x) the Issuer General Use Free Writing Prospectus(es) (as defined below) [listed on Schedule I hereto], issued at or prior to the Applicable Time and the Statutory Prospectus, all considered together (collectively, the "General Disclosure Package"), nor (y) any individual Issuer Limited Use Free Writing Prospectus [listed on Schedule I hereto], when considered together with the General Disclosure Package, included any untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

        Each Issuer Free Writing Prospectus, as of its issue date and at all subsequent times through the completion of the public offer and sale of the Notes, did not, does not and will not include any information that conflicted, conflicts or will conflict with the information contained in the Registration Statement or the Prospectus, including any document incorporated by reference therein and any preliminary or other prospectus deemed to be a part thereof that has not been superseded or modified.

        As used in this subsection and elsewhere in this Agreement:

        "Applicable Time" means    •    :00 [a/p]m (New York City time) on    •    or such other time as agreed by the Company and the Representatives.

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        "Issuer Free Writing Prospectus" means any "issuer free writing prospectus," as defined in Rule 433 of the 1933 Act Regulations ("Rule 433"), relating to the Notes that (i) is required to be filed with the Commission by the Company, (ii) is a "road show" that constitutes a written communication within the meaning of Rule 433(d)(8)(i), whether or not required to be filed with the Commission or (iii) is exempt from filing pursuant to Rule 433(d)(5)(i) because it contains a description of the Notes or of the offering thereof that does not reflect the final terms, in each case, in the form filed or required to be filed with the Commission or, if not required to be filed, in the form retained in the Company's records pursuant to Rule 433(g).

        "Issuer General Use Free Writing Prospectus" means any Issuer Free Writing Prospectus that is intended for general distribution to prospective investors, as evidenced by it being specified in Schedule C hereto.

        "Issuer Limited Use Free Writing Prospectus" means any Issuer Free Writing Prospectus that is not an Issuer General Use Free Writing Prospectus.

        "Statutory Prospectus" means the Base Prospectus and the preliminary prospectus supplement dated    •    relating to the Notes, including the Incorporated Documents. [If applicable, add reference to any supplements issued prior to the Applicable Time.]

        The foregoing representations and warranties in this subsection do not apply to statements or omissions in the Registration Statement, any preliminary prospectus, any Issuer Free Writing Prospectus or the Prospectus, or any amendments or supplements thereto, made in reliance upon information furnished to the Company in writing by or on behalf of the Underwriters through the Representatives expressly for use therein or to those parts of the Registration Statement which constitute the Trustee's Statements of Eligibility and Qualification on Form T-1 under the 1939 Act (collectively, the "Form T-1").

        There is no contract or document of a character required to be described in the Registration Statement, the Statutory Prospectus or the Prospectus or to be filed as an exhibit to the Registration Statement that is not described or filed as required. In the event that the Registration Statement (including any prospectus filed as part of the Registration Statement), any preliminary prospectus, any Issuer Free Writing Prospectus or the Prospectus or any amendment or supplement to any of the foregoing was or is filed electronically pursuant to EDGAR, then the Registration Statement (including any prospectus filed as part thereof), such preliminary prospectus, such Issuer Free Writing Prospectus, the Prospectus and any such amendment or supplement was or will be, as the case may be, identical (as to content) to the electronically transmitted copy thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

        (iv)  This Agreement, the Indenture and the Notes have been duly authorized by the Company and conform in all material respects to the descriptions thereof in the General Disclosure Package and the Prospectus.

        (v)   The Indenture has been duly qualified under the 1939 Act and (assuming the due execution and delivery thereof by the Trustee) is, and the Notes (when executed by the Company and authenticated in accordance with the Indenture and delivered to and paid for by the purchasers thereof) will be, the legal, valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except (x) as such enforceability may be subject to or limited by (A) bankruptcy, insolvency, reorganization, moratorium or other similar laws now or hereafter in effect relating to or affecting the enforcement of creditors' rights generally, (B) the applicability or effect of any fraudulent transfer, preference or similar law, (C) general principles of equity (regardless of whether such enforcement is considered in a proceeding in equity or at law), [To be deleted if notes are denominated in U.S. dollars—(D) requirements that a claim with respect to any Notes (or a judgment denominated other than in

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United States dollars in respect of such claim) be converted into United States dollars at a rate of exchange prevailing on a date determined pursuant to applicable law, (E) governmental authority to limit, delay or prohibit the making of payments outside the United States or in a foreign currency or currency units] or (F) the effect of general rules of contract law that limit the enforceability of provisions requiring indemnification of a party for liability for its own action or inaction to the extent the action or inaction involves gross negligence, recklessness, willful misconduct or unlawful conduct and (y) that the waiver contained in Section 515 of the Indenture may be deemed unenforceable. The Notes (when executed by the Company and authenticated in accordance with the terms of the Indenture and delivered to and paid for by the purchasers thereof) will be entitled to the benefits of the Indenture (subject to the exceptions set forth in the preceding sentence).

        (vi)  The Company and each of Occidental Chemical Holding Corporation, a California corporation, and Occidental Oil and Gas Holding Corporation, a California corporation formerly known as Occidental Oil and Gas Corporation (each a "Principal Domestic Subsidiary" and collectively the "Principal Domestic Subsidiaries") is a validly existing corporation in good standing under the laws of its state of incorporation. The Company and each Principal Domestic Subsidiary has full corporate power and authority to own its respective properties and carry on its respective business as presently conducted, as described in the General Disclosure Package and the Prospectus, and is duly registered or qualified to conduct business, and is in good standing, in each jurisdiction in which it owns or leases property or transacts business and in which such registration or qualification is necessary, except as to jurisdictions where the failure to do so would not have a material adverse effect on the Company and its subsidiaries, taken as a whole. All of the outstanding capital stock or other securities evidencing equity ownership of each Principal Domestic Subsidiary has been duly and validly authorized and issued and is fully paid and non-assessable, and, except as otherwise disclosed in the Registration Statement, the General Disclosure Package and the Prospectus, is owned by the Company, directly or indirectly through subsidiaries, free and clear of any security interest, claim, lien or encumbrance. Except as otherwise disclosed in the Registration Statement, the General Disclosure Package and the Prospectus, there are no outstanding rights, warrants or options to acquire, or instruments convertible into or exchangeable for, any shares of capital stock or other equity interest in any such Principal Domestic Subsidiary, except for rights, warrants or options held by the Company.

        (vii) Except as contemplated in the General Disclosure Package and the Prospectus or reflected therein by the filing of any amendment or supplement thereto or any Incorporated Document, since the date of the most recent consolidated financial statements included or incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus, unless the Company has notified the Underwriters as provided in Section 4(d) hereof, there has not been any material adverse change, or any development which is reasonably likely to result in a material adverse change, in the consolidated financial condition or consolidated results of operations of the Company and its subsidiaries, taken as a whole.

        (viii)  The Company is not in violation of its Restated Certificate of Incorporation or Bylaws, in each case, as amended. The execution and delivery of this Agreement by the Company, the issuance and sale of the Notes and the performance by the Company of its obligations under this Agreement and the Indenture will not conflict with or constitute a breach of or a default (with the passage of time or otherwise) under (A) the Restated Certificate of Incorporation or Bylaws of the Company, in each case, as amended, (B) subject to the Company's compliance with any applicable covenants pertaining to its incurrence of unsecured indebtedness contained therein, any agreement or instrument (which is, individually or in the aggregate, material to the Company and its subsidiaries, taken as a whole) to which the Company or any Principal Domestic Subsidiary is a party or by which any of them is bound or to which any of the property or assets of the Company

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or any Principal Domestic Subsidiary is subject or (C) any order of any court or governmental agency or authority presently in effect and applicable to the Company or any Principal Domestic Subsidiary. Except for orders, permits and similar authorizations required under the securities or Blue Sky laws of certain jurisdictions, including jurisdictions outside the United States, or required of any securities exchange on which any of the Notes might be listed, no consent, approval, authorization or other order of any regulatory body, administrative agency or other governmental body is legally required for the valid issuance and sale of the Notes. As of the date of this Agreement, both immediately before and immediately after giving effect to the execution and delivery of this Agreement, and as of the Closing Time, both immediately before and immediately after giving effect to the issuance and sale of the Notes, the Company was and will be in compliance with the requirements of any applicable covenants pertaining to its incurrence of unsecured indebtedness contained in the agreements or instruments referred to in clause (B) above.

        (ix)  To the best of the Company's knowledge, the accountants who have audited and reported upon the consolidated financial statements filed with the Commission as part of the Registration Statement, the General Disclosure Package and the Prospectus are independent registered public accountants as required by the 1933 Act. The consolidated financial statements included in the Registration Statement, the General Disclosure Package and the Prospectus, or incorporated therein by reference, fairly present in all material respects the consolidated financial position and results of operations of the entities to which such statements relate at the respective dates and for the respective periods to which they apply. Such consolidated financial statements have been prepared in accordance with generally accepted accounting principles consistently applied, except as set forth in the Registration Statement, the General Disclosure Package and Prospectus.

        (x)   The Company maintains an effective system of "disclosure controls and procedures" (as defined in Rule 13a-15(e) of the 1934 Act) that is designed to ensure that information required to be disclosed by the Company in reports that it files or submits under the 1934 Act is recorded, processed, summarized and reported within the time periods specified in the Commission's rules and forms, including controls and procedures designed to ensure that such information is accumulated and communicated to the Company's management as appropriate to allow timely decisions regarding required disclosure. The Company has carried out evaluations of the effectiveness of their disclosure controls and procedures as required by Rule 13a-15 of the 1934 Act.

        (xi)  The Company maintains systems of "internal control over financial reporting" (as defined in Rule 13a-15(f) of the 1934 Act) that comply with the requirements of the 1934 Act and have been designed by, or under the supervision of, its principal executive and principal financial officers, or persons performing similar functions, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles, including, but not limited to internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management's general or specific authorizations; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset accountability; (iii) access to assets is permitted only in accordance with management's general or specific authorization; and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. Except as disclosed in the Registration Statement, the General Disclosure Package and the Prospectus, there are no material weaknesses in the Company's internal controls and there has been no change in the Company's internal control over financial reporting that has materially affected or is reasonably likely to materially affect the Company's internal control over financial reporting.

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        (b)   Additional Certifications.    Any certificate signed by any officer of the Company and delivered to the Underwriters, the Representatives or to counsel for the Underwriters in connection with transactions contemplated hereby shall be deemed a representation and warranty by the Company to the Underwriters as to the matters covered thereby on the date of such certificate.

SECTION 2.    Sale and Delivery to the Underwriters; Closing.

        (a)   Purchase and Sale.    On the basis of the representations and warranties herein contained and subject to the terms and conditions herein set forth, the Company agrees to issue and sell to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to purchase from the Company, at    •    % of the principal amount thereof, the principal amount of Notes set forth on Schedule A opposite the name of such Underwriter.

        (b)   Closing Time.    Payment of the purchase price for, and delivery of the certificates for, the Notes shall be made at the offices of    •    , or at such other place as shall be agreed upon by the Underwriters and the Company, at 10:00 a.m., New York City time, on     •    (unless postponed in accordance with the provisions of Section 11), or such other time not later than ten business days after such date as shall be agreed upon by the Representatives and the Company (such time and date of payment and delivery being herein called "Closing Time"). Payment shall be made to the Company by wire transfer of immediately available funds to a bank account designated by the Company, against delivery to the Underwriters of certificates for the Notes to be purchased by them. Certificates for the Notes shall be in such denominations and registered in such names as the Underwriters may request in writing by 12:00 noon New York City time at least one full business day before Closing Time. It is understood that each Underwriter has authorized the Representatives for its respective account, to accept delivery of, and receipt for, and make payment of the purchase price for, the Notes which such Underwriter has agreed to purchase. The certificates for the Notes will be made available for examination and packaging by the Underwriters not later than 10:00 a.m. on the last business day prior to Closing Time in The City of New York.

SECTION 3.    Foreign Offerings.

        Each Underwriter, severally and not jointly, represents and agrees that (i) it has not solicited, and will not solicit, offers to purchase any of the Notes from, (ii) it has not sold, and will not sell, any of the Notes to, and (iii) it has not distributed, and will not distribute, the General Disclosure Package or the Prospectus to, any person or entity in any jurisdiction outside of the United States (collectively "Foreign Offers and Sales") except, in each case, in compliance in all material respects with all applicable laws and, in connection with the initial offering of, or subscription for, any of the Notes, only with the prior written consent of the Company and in full compliance with any requirements and procedures established by the Company with respect to any such Foreign Offers and Sales. For the purposes of this paragraph, "United States" means the United States of America, its territories, its possessions (including the Commonwealth of Puerto Rico) and other areas subject to its jurisdiction.

        In particular and without limiting the generality of the foregoing:

        (i)    Each Underwriter, severally and not jointly, agrees to distribute, in connection with any Foreign Offers and Sales, only those Prospectuses used in connection therewith that have been appropriately "stickered" for use in the jurisdiction in which such Foreign Offers and Sales are to be made.

        (ii)   With respect to the United Kingdom, each Underwriter represents and agrees, severally and not jointly, that: (A) it has only communicated or caused to be communicated and will only communicate or cause to be communicated an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000 ("FSMA")) received by it in connection with the issue or sale of the Notes in circumstances in which Section 21(1) of FSMA does not apply to the Company; and (B) it has complied and will

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comply with all applicable provisions of FSMA with respect to anything done by it in relation to the Notes in, from or otherwise involving the United Kingdom.

        (iii)  In relation to each Member State of the European Economic Area which has implemented the Prospectus Directive (each, a "Relevant Member State"), each Underwriter represents and agrees, severally and not jointly, that, with effect from and including the date on which the Prospectus Directive is implemented in that Relevant Member State (the "Relevant Implementation Date"), it has not made and will not make an offer of Notes to the public in that Relevant Member State except that it may, with the effect from and including the Relevant Implementation Date, make an offer of Notes to the public in that Relevant Member State:

(i)

to legal entities which are authorized or regulated to operate in the financial markets or, if not so authorized or regulated, whose corporate purpose is solely to invest in securities;



(ii)

to any legal entity which has two or more of (1) an average of at least 250 employees during the last financial year; (2) a total balance sheet of more than €43,000,000; and (3) an annual net turnover of more than €50,000,000, as shown in its last annual or consolidated accounts;



(iii)

to fewer than 100 natural or legal persons (other than qualified investors as defined in the Prospectus Directive) subject to obtaining the prior consent of the Representatives; or



(iv)

in any other circumstances falling within Article 3(2) of the Prospectus Directive,

provided that no such offer of Notes referred to in (a) through (d) above shall require the Company or any Underwriter to publish a prospectus pursuant to Article 3 of the Prospectus Directive.

For the purposes of this subparagraph (iii), the expression an "offer of Notes to the public" in relation to any Notes in any Relevant Member State means the communication in any form, and by any means, of sufficient information on the terms of the offer and the Notes to be offered so as to enable an investor to decide to purchase or subscribe the Notes, as the same may be varied in that Member State by any measure implementing the Prospectus Directive in that Member State and the expression "Prospectus Directive" means Directive 2003/71/EC and includes any relevant implementing measure in each Relevant Member State.

        (iv)  With respect to Japan, each Underwriter, severally and not jointly, understands that the Notes have not been, and will not be, registered under the Financial Instruments and Exchange Law of Japan (Law No. 25 of 1948, as amended) (the "FIEL"), and, accordingly, each Underwriter, severally and not jointly, represents and agrees that (A) in connection with the initial offering of any of the Notes, such Underwriter has not, directly or indirectly, offered or sold, and will not, directly or indirectly, offer or sell, any of the Notes in Japan or to any resident of Japan (including any corporation or other entity incorporated or organized under the laws of Japan), or to others for re-offering or resale, directly or indirectly, in Japan or to any such resident of Japan, except, in each case, in compliance in all material respects with the FIEL, and (B) with respect to any such sale of the Notes made by such Underwriter, such Underwriter will effect all necessary filings in connection with such sale, including, without limitation, any required filings of notifications with the Ministry of Finance of Japan, as required pursuant to the provisions of the Exchange and Foreign Trade Act of Japan (Law No. 228 of 1949, as amended).

        (v)   With respect to the Provinces of Canada (the "Provinces"), each Underwriter, severally and not jointly, represents and agrees that, in connection with the initial offering of any of the Notes, (A) such Underwriter will not, directly or indirectly, offer or sell any of the Notes in any of

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the Provinces or to, or for the benefit of, any resident of any of the Provinces after the date (the "Canadian Ending Date") set by the Company for the end of the offer of such Notes, and, without the prior written consent of the Company, such Underwriter will not distribute or permit to be distributed any Prospectus in any of the Provinces or to, or for the benefit of, any resident of any of the Provinces after the Canadian Ending Date, (B) with respect to anything done by such Underwriter in relation to the Notes in, from, or otherwise involving, any of the Provinces, such Underwriter has complied, and will comply, in all material respects, with all applicable provisions of the securities legislation of Canada and the Provinces (the "Canadian Securities Legislation") (including, without limitation, the conveyance, or the provision of assistance to the Company in conveying, any right of rescission, damages or other right as required by applicable Canadian Securities Legislation) so that any offer or sale of any of the Notes in the Provinces, or any of them, will qualify for exemptions from prospectus, registration and equivalent requirements, or exemptions from other applicable requirements, as prescribed by the Canadian Securities Legislation in force at the time when such offer or sale is made, provided that such offer or sale is made pursuant to the Prospectus, as supplemented to the extent required by the Canadian Securities Legislation (the Prospectus, as so supplemented, hereinafter referred to as the "Canadian Offering Memorandum"), (C) with respect to Notes offered or sold, or to be offered or sold, by such Underwriter, or Notes purchased, or to be purchased, by such Underwriter, it has provided, and will provide, investors, where required pursuant to the provisions of applicable Canadian Securities Legislation, with (1) the Canadian Offering Memorandum, and (2) a list of the documents filed by the Company with the Commission pursuant to Sections 13(a), 13(c), 14 or 15(d) of the 1934 Act subsequent to the date of the Prospectus dated    •    , and will obtain from each of such investors an acknowledgment in form reasonably satisfactory to the Company, and (D) with respect to any such sale of the Notes made by such Underwriter, such Underwriter will effect all necessary filings in connection with such sale, including, without limitation, any required filings of (x) reports of trades and (y) the Canadian Offering Memorandum, in each case with provincial securities commissions, as required pursuant to the provisions of applicable Canadian Securities Legislation.

SECTION 4.    Covenants of the Company.

        The Company covenants with each Underwriter as follows:

        (a)   Notice of Certain Events.    During the period from the date hereof to and including the time at which the distribution of the Notes is completed, the Company will notify the Underwriters promptly (i) of the effectiveness of any post-effective amendment to the Registration Statement (other than a post-effective amendment relating solely to an offering of securities other than the Notes), (ii) of the transmittal to the Commission for filing of any supplement to any preliminary prospectus or the Prospectus (other than an amendment or supplement relating solely to an offering of securities other than the Notes) or any document to be filed pursuant to the 1934 Act which would be incorporated by reference in the Prospectus, (iii) of the receipt of any comments from the Commission with respect to the Registration Statement, any Issuer Free Writing Prospectus, any preliminary prospectus or the Prospectus, (iv) of any request by the Commission for any amendment to the Registration Statement or any amendment or supplement to the Prospectus, any preliminary prospectus or any Issuer Free Writing Prospectus or for additional information, (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or the initiation of any proceedings for that purpose, (vi) of the receipt of notice from one or more of Standard & Poor's Corporation and Moody's Investors Service, Inc. (or any of their respective successors) that the Notes have been or are going to be placed on what is commonly termed a "watch list" for possible downgrading and (vii) of any examination pursuant to Section 8(e) of the 1933 Act concerning the Registration Statement or if the Company becomes the subject of a proceeding under Section 8A of the 1933 Act in connection with the offering of the Notes. The Company will make every reasonable effort to prevent the issuance

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of any such stop order and, if any such stop order is issued, to obtain the lifting thereof at the earliest possible moment. The Company shall pay the required Commission filing fees relating to the Notes within the time required by Rule 456(b)(1) (i) of the 1933 Act Regulations and otherwise in accordance with Rules 456(b) and 457(r) of the 1933 Act Regulations (including, if applicable, by updating the "Calculation of Registration Fee" table in accordance with Rule 456(b)(1)(ii) either in a post-effective amendment to the Registration Statement or on the cover page of a prospectus or prospectus supplement filed pursuant to Rule 424(b)).

        (b)   Notice of Certain Proposed Filings.    During the period from the date hereof to and including the Closing Time, the Company will give the Underwriters advance notice of its intention to file any amendment to the Registration Statement or any amendment or supplement to the prospectus included in the Registration Statement at the time it became effective or any amendment or supplement to any preliminary prospectus or the Prospectus and will furnish the Underwriters with copies of any such amendment or supplement, and will not file any such amendment or supplement of which the Underwriters shall not previously have been advised or to which the Representatives shall reasonably object in writing, unless, in the judgment of the Company and its counsel, such amendment or supplement is necessary to comply with law.

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        (c)   Copies of the Registration Statement and the Prospectus.    The Company will deliver to each of the Underwriters one signed and as many conformed copies of the Registration Statement (as originally filed) and of each amendment thereto relating to the Notes (including the Incorporated Documents and any exhibits filed therewith or incorporated by reference therein) as the Underwriters may reasonably request. The Company will furnish to the Underwriters as many copies of the Prospectus (as amended or supplemented) and any Issuer Free Writing Prospectuses as the Underwriters shall reasonably request so long as the Underwriters are required to deliver a Prospectus (or, in lieu thereof, the notice referred to in Rule 173(a) of the 1933 Act Regulations) in connection with sales or solicitations of offers to purchase the Notes.

        (d)   Revisions of Prospectus—Material Changes.    So long as the Underwriters are required to deliver a Prospectus (or, in lieu thereof, the notice referred to in Rule 173(a) of the 1933 Act Regulations) in connection with sales or solicitations of offers to purchase the Notes, if any event shall occur or condition exist as a result of which it is necessary, in the opinion of counsel for the Company and of counsel for the Underwriters, to further amend or supplement the Prospectus in order that the Prospectus will not include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein not misleading, in the light of the circumstances existing at the time it is delivered to a purchaser, or if it shall be necessary, in the opinion of such counsel, to amend or supplement the Registration Statement or the Prospectus in order to comply with the requirements of the 1933 Act or the 1933 Act Regulations, prompt notice shall be given, and confirmed in writing, to the Underwriters, and the Company will promptly prepare and file an amendment or supplement to the Prospectus so that the Prospectus, as amended or supplemented, will not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein not misleading, in the light of the circumstances existing at the time it is delivered to the Underwriters. If at any time following issuance of an Issuer Free Writing Prospectus there occurred or occurs an event or development as a result of which such Issuer Free Writing Prospectus conflicted or would conflict with the information contained in the Registration Statement or the Prospectus or any preliminary prospectus or included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at that subsequent time, not misleading, the Company will promptly notify the Underwriters and will promptly amend or supplement such Issuer Free Writing Prospectus to eliminate or correct such conflict, untrue statement or omission.

        (e)   Earnings Statements.    The Company will make generally available to its security holders a consolidated earnings statement (which need not be audited) covering a period of at least twelve months commencing after the Closing Time, as soon as is reasonably practicable after the end of such period, which earnings statement will satisfy the provisions of Section 11(a) of the 1933 Act (and at the option of the Company, Rule 158 of the 1933 Act Regulations).

        (f)    Blue Sky Qualifications.    The Company will endeavor, in cooperation with the Underwriters, to qualify the Notes for offering and sale under the applicable securities laws of such states and other jurisdictions as the Underwriters may reasonably designate (provided no registration shall be required in any jurisdiction outside the United States), and will maintain such qualifications in effect for as long as may be required for the distribution of the Notes; provided, however, that the Company will promptly notify the Underwriters of any suspension of any such qualifications; and provided, further, that the Company shall not be obligated to register or qualify as a foreign corporation or take any action which would subject it to general service of process in any jurisdiction where it is not now so subject.

        (g)   Filing of Prospectus and Issuer Free Writing Prospectus.    If required, the Company will file the final Prospectus with the Commission within the time periods specified by Rule 424(b) and Rule 430B under the 1933 Act. Additionally, the Company will file any Issuer Free Writing Prospectus to the extent required by Rule 433 under the 1933 Act.

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        (h)   Issuer Free Writing Prospectuses.    The Company represents and agrees that, unless it obtains the prior consent of the Underwriters (which shall not be unreasonably withheld or delayed), and each Underwriter, severally and not jointly, represents and agrees that, unless it obtains the prior written consent of the Company and the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers] (which shall not be unreasonably withheld or delayed), it has not made and will not make any offer relating to the Notes that would constitute an "issuer free writing prospectus," as defined in Rule 433, or that would otherwise constitute a "free writing prospectus," as defined in Rule 405, required to be filed by the Company with the Commission or retained by the Company pursuant to Rule 433.

SECTION 5.    Payment of Expenses.

        The Company will pay all expenses incident to the performance of its obligations under this Agreement, including:

        (i)    The preparation and filing of the Registration Statement and all amendments thereto, the General Disclosure Package, each preliminary prospectus and the Prospectus and any amendments or supplements thereto and all Incorporated Documents;

        (ii)   The preparation, filing and printing of this Agreement;

        (iii)  The preparation, printing, issuance and delivery of the Notes;

        (iv)  The reasonable fees and disbursements of the Trustee and its counsel and of any calculation agent or exchange rate agent in connection with the Indenture and the Notes;

        (v)   The qualification of the Notes under securities laws in accordance with the provisions of Section 4(f) hereof, including filing fees and the reasonable fees and disbursements of counsel to the Underwriters in connection therewith and in connection with the preparation of any Blue Sky survey and any legal investment survey;

        (vi)  The printing and delivery to the Underwriters in quantities as hereinabove stated of copies of the Registration Statement and any amendments thereto, and of the General Disclosure Package, each preliminary prospectus and the Prospectus and any amendments or supplements thereto relating to the Notes, and the delivery by the Underwriters of the General Disclosure Package, each preliminary prospectus and the Prospectus and any amendments or supplements thereto in connection with solicitations of offers to purchase, or confirmations of sales of, the Notes;

        (vii) The preparation, printing and delivery to the Underwriters of copies of the Indenture;

        (viii)  Any fees charged by rating agencies for the rating of the Notes; and

        (ix)  The fees and expenses, if any, incurred with respect to any filing with the Financial Industry Regulatory Authority, Inc. ("FINRA") relating to the offering made hereby.

        If this Agreement is terminated pursuant to any of the provisions hereof (otherwise than by notice given by the Underwriters in connection with the occurrence of any event set forth in clauses (ii) through (iv) of Section 10(a) or pursuant to Section 11), the Company shall reimburse the Underwriters for all of their out-of-pocket expenses, including the reasonable fees and disbursements of counsel for the Underwriters.

SECTION 6.    Conditions of Underwriters' Obligations.

        The obligations of the Underwriters hereunder are subject to the accuracy of the representations and warranties on the part of the Company herein and the accuracy of the statements of the Company's officers made in any certificate furnished pursuant to the provisions hereof, to the

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performance and observance by the Company of all covenants and agreements herein contained on its part to be performed and observed and to the following additional conditions precedent:

        (a)   The Registration Statement shall have become effective under the 1933 Act and at the Closing Time, no stop order suspending the effectiveness of the Registration Statement shall have been issued and no proceedings for that purpose shall be instituted or to the knowledge of the Company or the Underwriters, threatened or contemplated by the Commission; no stop order suspending the sale of the Notes in any jurisdiction designated by the Underwriters pursuant to Section 4(f) shall have been issued and no proceedings for that purpose shall have been instituted, or to the knowledge of the Company or the Underwriters, threatened or shall be contemplated; any request of the Commission for additional information (to be included in the Registration Statement, the General Disclosure Package, any preliminary prospectus or the Prospectus or otherwise) shall have been complied with to the reasonable satisfaction of counsel to the Underwriters. The Prospectus shall have been filed with the Commission pursuant to Rule 424(b) and each Issuer Free Writing Prospectus shall have been filed with the Commission to the extent required by Rule 164 or Rule 433, as applicable, within the applicable time period prescribed for such filing by the rules and regulations under the 1933 Act and in accordance with Section 4(g) hereof, and all requests of the Representative for additional information shall have been complied with to the reasonable satisfaction of the Representative;

        (b)   The Underwriters shall have received an opinion from internal counsel of the Company, dated as of the Closing Time and in form and substance satisfactory to counsel for the Underwriters, to the effect set forth in Exhibit C.

        (c)   The Underwriters shall have received an opinion from counsel to the Underwriters, dated as of the Closing Time and in form and substance satisfactory to the Representatives.

        (d)   Officer's Certificate.    Except as contemplated in the Prospectus and the General Disclosure Package or reflected therein by the filing of any amendment or supplement thereto or any Incorporated Document, at the Closing Time, there shall not have been, since the date of the most recent consolidated financial statements included or incorporated by reference in the Prospectus or the General Disclosure Package, any material adverse change, or any development which is reasonably likely to result in a material adverse change, in the consolidated financial condition or consolidated results of operations of the Company and its subsidiaries, taken as a whole. The Underwriters shall have received a certificate signed by an officer of the Company, dated as of the Closing Time, to the effect (i) that there has been no such material adverse change, (ii) that the representations and warranties of the Company contained in Section 1(a) hereof (other than Section 1(a)(vii)) are true and correct with the same force and effect as though expressly made at and as of the date of such certificate, (iii) that the Company has complied with all agreements and satisfied all conditions required by this Agreement or the Indenture on its part to be performed or satisfied at or prior to the date of such certificate and (iv) that no stop order suspending the effectiveness of the Registration Statement has been issued and, to the best of such officer's knowledge, no proceedings for that purpose have been initiated or threatened by the Commission.

        (e)   Comfort Letter.    On the date hereof, the Underwriters shall have received a letter from the Company's independent registered public accounting firm, dated as of the date hereof and in form and substance satisfactory to the Representatives, containing statements and information of a type ordinarily included in accountants' "comfort letters" to underwriters with respect to the financial statements and certain financial information contained or incorporated by reference in the Registration Statement and the Prospectus; and, if financial statements for any assets, business or entity acquired by the Company are included or incorporated by reference in the Registration Statement, the General Disclosure Package or the Prospectus, the Underwriters shall have received a similar "comfort letter" from an independent registered public accounting firm, dated as of the date hereof and in form and substance satisfactory to the Representatives, with respect to such financial statements and any financial

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information with respect to such assets, business or entity, as the case may be, contained or incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus.

        (f)    Subsequent Delivery of Comfort Letter.    At the Closing Time, the Underwriters shall have received from each independent registered public accounting firm which delivered a letter pursuant to subsection (e) of this Section, a letter, dated as of the Closing Time, to the effect that they reaffirm the statements made in the letter furnished pursuant to subsection (e) of this Section, except that the specified date referred to shall be a date not more than five days prior to the Closing Time.

        (g)   Other Documents.    At the Closing Time, counsel for the Underwriters shall have been furnished with such documents and opinions as such counsel may reasonably require for the purpose of enabling such counsel to pass upon the issuance and sale of the Notes as herein contemplated and related proceedings, or in order to evidence the accuracy and completeness of any of the representations and warranties, or the fulfillment of any of the conditions, herein contained.

        If any condition specified in this Section 6 shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated by the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers] by notice to the Company at any time at or prior to the Closing Time, and any such termination shall be without liability of any party to any other party, except that the covenant in Section 4(e) hereof, the provisions of Section 5 hereof, and the indemnity and contribution agreements set forth in Sections 7 and 8 hereof and the provisions of Sections 9 and 14 hereof shall remain in effect.

SECTION 7.    Indemnification.

        (a)   Indemnification of the Underwriters.    The Company agrees to indemnify and hold harmless each Underwriter and each person, if any, who controls an Underwriter within the meaning of Section 15 of the 1933 Act as follows:

        (i)    against any and all loss, liability, claim, damage and expense whatsoever (including, subject to the limitations set forth in subsection (c) below, the reasonable fees and disbursements of counsel chosen by the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers]), as incurred, insofar as such loss, liability, claim, damage or expense arises out of any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement (or any amendment thereto), or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading, or arises out of any untrue statement or alleged untrue statement of a material fact contained in any preliminary prospectus, the General Disclosure Package, any Issuer Free Writing Prospectus or the Prospectus (or any amendment or supplement thereto) or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading;

        (ii)   against any and all loss, liability, claim, damage and expense whatsoever (including, subject to the limitations set forth in subsection (c) below, the reasonable fees and disbursements of counsel chosen by the Underwriters), as incurred, to the extent of the aggregate amount paid in settlement of any litigation, or investigation or proceeding by any governmental agency or body, commenced or threatened, or of any claim whatsoever, insofar as such loss, liability, claim, damage or expense arises out of any such untrue statement or omission, or any such alleged untrue statement or omission, if such settlement is effected with the written consent of the Company; and

        (iii)  against any and all expense whatsoever (including, subject to the limitations set forth in subsection (c) below, the reasonable fees and disbursements of counsel chosen by the Underwriters), as incurred, reasonably incurred in investigating, preparing or defending against any

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litigation, or investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever, based upon any such untrue statement or omission, or any such alleged untrue statement or omission;

provided, however, that this indemnity shall not apply to any loss, liability, claim, damage or expense (A) to the extent arising out of or based upon any untrue statement or omission or alleged untrue statement or omission made in reliance upon the Form T-1 under the 1939 Act filed as an exhibit to the Registration Statement; or (B) as to which such Underwriter may be required to indemnify the Company pursuant to the provisions of subsection (b) of this Section 7; or (C) if such loss, liability, claim, damage or expense is covered by any other written agreement between the Company and such Underwriter pertaining to the sale of the Notes pursuant to which such Underwriter may be required to indemnify the Company for such loss, liability, claim, damage or expense.

        (b)   Indemnification of the Company.    Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, its directors, each of its officers who signed the Registration Statement, and each person, if any, who controls the Company within the meaning of Section 15 of the 1933 Act against any and all loss, liability, claim, damage and expense described in the indemnity contained in subsection (a) of this Section 7, as incurred, but only with respect to untrue statements or omissions, or alleged untrue statements or omissions, made in the Registration Statement, any preliminary prospectus, the General Disclosure Package, any Issuer Free Writing Prospectus or the Prospectus (or any amendment or supplement thereto) in reliance upon and in conformity with written information furnished to the Company by or on behalf of such Underwriter through the Representatives expressly for use in the Registration Statement, such preliminary prospectus, the General Disclosure Package, such Issuer Free Writing Prospectus or the Prospectus (or such amendment or supplement).

        (c)   General.    (i) In case any action, suit or proceeding (including any governmental or regulatory investigation or proceeding) shall be brought against any Underwriter or any person controlling such Underwriter, based upon the Registration Statement, any preliminary prospectus, the General Disclosure Package, any Issuer Free Writing Prospectus or the Prospectus (or any amendment or supplement thereto) and with respect to which indemnity may be sought against the Company pursuant to this Section 7, such Underwriter or controlling person shall promptly notify the Company in writing, and the Company shall assume the defense thereof, including the employment of counsel reasonably satisfactory to the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers] and payment of all expenses. Failure to give such notice shall not relieve the Company from any liability which it may have otherwise than on account of the indemnity contained in this Section 7. Any such Underwriter or any such controlling person shall have the right to employ separate counsel in any such action, suit or proceeding and to participate in the defense thereof, but the fees and expenses of such separate counsel shall be at the expense of such Underwriter or such controlling person, unless (A) the employment of such counsel shall have been specifically authorized in writing by the Company, (B) the Company shall have failed to assume the defense and employ reasonably satisfactory counsel or (C) the named parties to any such action, suit or proceeding (including any impleaded parties) shall include both such Underwriter or such controlling person and the Company, and such Underwriter or such controlling person shall have been advised by such counsel that there may be one or more legal defenses available to it that are different from, or additional to, those available to the Company (in which case, if such Underwriter or such controlling person notifies the Company in writing that it elects to employ separate counsel at the expense of the Company, the Company shall not have the right to assume the defense of such action, suit or proceeding on behalf of such Underwriter or such controlling person, it being understood, however, that the Company shall not, in connection with any one such action or separate but substantially similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances, be liable for the reasonable fees and expenses of more than one separate firm of attorneys (in addition to any local

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counsel) for all such Underwriters and all such controlling persons, which firm shall be designated in writing by the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers], on behalf of all of such Underwriters and such controlling persons).

        (ii)   In case any action, suit or proceeding (including any governmental or regulatory investigation or proceeding) shall be brought against the Company, any of the Company's directors or officers, or any person controlling the Company, with respect to which indemnity may be sought against any Underwriter pursuant to this Section 7, such Underwriter shall have the rights and duties given to the Company by subsection (c)(i) of this Section 7 with respect thereto (provided that, notwithstanding the foregoing, any authorization of the nature specified in clause (A) of subsection (c)(1) of this Section 7 may be given only by the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers] and copies of all notices given by the Company of the nature specified in such subsection (c)(1) of this Section 7 shall also be sent to the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers]), and the Company, the Company's directors and officers and any such controlling person shall have the rights and duties given to the Underwriters by subsection (c)(i) of this Section 7 with respect thereto.

SECTION 8.    Contribution.

        In order to provide for just and equitable contribution in circumstances in which the indemnity agreement provided for in Section 7 hereof is for any reason held to be unenforceable with respect to the indemnified parties, although applicable in accordance with its terms, the Company and the Underwriters shall contribute to the aggregate losses, liabilities, claims, damages and expenses of the nature contemplated by said indemnity agreement incurred by the Company and the Underwriters, as incurred, (i) in such proportion as is appropriate to reflect the relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand, from the offering of the Notes or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company, on the one hand, and of the Underwriters, on the other hand, in connection with the statements or omissions that resulted in such losses, liabilities, claims, damages and expenses. The relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand, shall be deemed to be in the same proportions as the total net proceeds from the sale of the Notes (before deducting expenses) received by the Company, on the one hand, and the total underwriting discounts and commissions received by the Underwriters, on the other hand, bear to the total price to public of the Notes as set forth in the table on the cover page of the Prospectus. The relative fault of the Company, on the one hand, and the Underwriters, on the other hand, shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by the Underwriters and the parties' relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Underwriters' respective obligations to contribute pursuant to this Section 8 are several in proportion to the respective principal amounts of Notes set forth opposite their names in Schedule A hereto, and not joint. Notwithstanding the provisions of this Section 8, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Notes underwritten by it and distributed by the public were offered to the public exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. For purposes of this Section 8, each person, if any, who controls an Underwriter within the meaning of Section 15 of the 1933 Act shall have the same rights to contribution as such Underwriter, and each director of the Company, each officer of the Company who

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signed the Registration Statement and each person, if any, who controls the Company within the meaning of Section 15 of the 1933 Act shall have the same rights to contribution as the Company. Any party entitled to contribution hereunder will, promptly after receipt of notice of commencement of any action, suit or proceeding against such party in respect of which a claim for contribution may be made against another party or parties under this Section 8, notify such party or parties from whom contribution may be sought (with, in the case of any notice given by the Company or any of its officers, directors or controlling persons, a copy to the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers]), but the omission to so notify such party or parties shall not relieve the party or parties from whom contribution may be sought from any other obligation it or they may have otherwise than under this Section 8.

SECTION 9.    Representations, Warranties and Agreements to Survive Delivery.

        All representations, warranties and agreements contained in this Agreement, or contained in certificates of officers of the Company submitted pursuant hereto, shall remain operative and in full force and effect, regardless of any investigation made by or on behalf of any Underwriter or any controlling person of any Underwriter, or by or on behalf of the Company, and shall survive delivery of and payment for any of the Notes.

SECTION 10.    Termination.

        (a)   The Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers] may terminate this Agreement, by notice to the Company, at any time at or prior to the Closing Time if between the date hereof and the Closing Date (i) there shall have been any material adverse change in the consolidated financial condition of the Company and its subsidiaries, taken as a whole, (ii) there shall have occurred any material adverse change in the financial markets in the United States or any outbreak or escalation of hostilities or other national or international calamity or crisis, the effect of which shall be such as to make it, in the reasonable judgment of the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers], impracticable to market or to enforce contracts for sale of the Notes, (iii) trading in any securities of the Company shall have been suspended by the Commission or a national securities exchange in the United States, or if trading generally on the New York Stock Exchange shall have been suspended or settlement shall have been materially disrupted, or minimum or maximum prices for trading shall have been fixed, or maximum ranges for prices for securities shall have been required, by said exchange or by order of the Commission or any other governmental authority, or if a banking moratorium shall have been declared by either Federal or New York authorities [To be deleted if Notes are denominated in U.S. dollars—or if a banking moratorium shall have been declared by the relevant authorities in the country or countries of origin of any foreign currency or currencies in which the Notes are denominated or payable], (iv) any of Standard & Poor's Corporation and Moody's Investors Service, Inc. (or any of their respective successors) shall have publicly announced that it has (A) placed the Notes or the Company's unsecured senior long term debt generally on what is commonly termed a "watch list" for possible downgrading or (B) downgraded the Notes or the Company's unsecured senior long term debt generally, or (v) the Company shall have failed to furnish or cause to be furnished the certificates, opinions or letters referred to in Section 6 hereof.

        (b)   If this Agreement is terminated pursuant to this Section, such termination shall be without liability of any party to any other party except as provided in Section 5.

SECTION 11.    Default by One or More of the Underwriters.

        If one or more of the Underwriters shall fail at Closing Time to purchase the Notes which it or they are obligated to purchase under this Agreement (the "Defaulted Notes"), the non-defaulting Underwriters shall have the right, within 24 hours thereafter, to make arrangements for one or more of

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such non-defaulting Underwriters, or any other underwriters, to purchase all, but not less than all, of the Defaulted Notes in such amounts as may be agreed upon and upon the terms herein set forth; if, however, such non-defaulting Underwriters shall not have completed such arrangements within such 24-hour period, then:

        (a)   if the aggregate principal amount of Defaulted Notes does not exceed 10% of the aggregate principal amount of the Notes, the non-defaulting Underwriters shall be obligated to purchase the full amount thereof in the proportions that their respective underwriting obligations hereunder bear to the underwriting obligations of all non-defaulting Underwriters, or

        (b)   if the aggregate principal amount of Defaulted Notes exceeds 10% of the aggregate principal amount of the Notes, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

        No action pursuant to this Section shall relieve any defaulting Underwriter from liability in respect of its default.

        In the event of any such default which does not result in a termination of this Agreement, either the Representatives [If applicable, reference to Representatives may be replaced with names of book-running managers] or the Company shall have the right to postpone the Closing Time for a period not exceeding seven days in order to effect any required changes in the Registration Statement or Prospectus or in any other documents or arrangements. The term "Underwriter" as used in this Agreement shall include any underwriter substituted for a defaulting Underwriter.

SECTION 12.    Notices.

        All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters and the Representatives shall be directed to them c/o    •    . Notices to the Company shall be directed to it at 10889 Wilshire Boulevard, Los Angeles, California 90024, attention of Vice President and Treasurer.

SECTION 13.    Parties.

        This Agreement shall inure to the benefit of and be binding upon the Underwriters and the Company and their respective successors. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any person, firm or corporation, other than the parties hereto and their respective successors and the controlling persons and officers and directors referred to in Sections 7 and 8 hereof and their heirs and legal representatives, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provisions herein contained. This Agreement and all conditions and provisions hereof are intended to be for the sole and exclusive benefit of the parties hereto and their respective successors and said controlling persons and officers and directors and their heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Notes shall be deemed to be a successor by reason merely of such purchase.

SECTION 14.    Governing Law.

        This Agreement and the rights and obligations of the parties created hereby shall be governed by and construed in accordance with the laws of the State of New York applicable to agreements made and to be performed in such State, including, without limitation, Section 5- 1401 of the New York General Obligations Law.

[Signature Page Follows]

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        If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument along with all counterparts will become a binding agreement between the Underwriters and the Company in accordance with its terms.

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Exhibit 1.1

OCCIDENTAL PETROLEUM CORPORATION FORM OF UNDERWRITING AGREEMENT

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Exhibit 5.1

[OCCIDENTAL LETTERHEAD]

August 11, 2008

Occidental Petroleum Corporation
10889 Wilshire Boulevard
Los Angeles, California 90024

Re:

Registration Statement on Form S-3 of
Occidental Petroleum Corporation

Ladies and Gentlemen:

        I am Associate General Counsel of Occidental Petroleum Corporation, a Delaware corporation ("Occidental"), and am rendering this opinion in connection with the preparation of the above- referenced Registration Statement on Form S-3, which was filed by Occidental on August 8, 2008 with the Securities and Exchange Commission (the "Commission"), as amended by Post-Effective Amendment No. 1 to such Registration Statement, which was filed by Occidental on August 11, 2008 with the Commission (as so amended, the "Registration Statement"). The Registration Statement relates to the registration under the Securities Act of 1933, as amended (the "Securities Act"), of Occidental's senior unsecured debt securities (the "Senior Debt Securities"), which may be issued pursuant to an indenture, dated as of April 1, 1998, between Occidental and The Bank of New York Mellon Trust Company, N.A., a national banking association, as successor to The Bank of New York, as trustee (as amended or supplemented, the "Senior Indenture"). The Senior Debt Securities are being registered for offering and sale from time to time pursuant to Rule 415 under the Securities Act.

        This opinion is delivered in accordance with the requirements of Item 601(b)(5) of Regulation S-K under the Securities Act.

        In connection with this opinion, I have examined and am familiar with originals or copies, certified or otherwise identified to my satisfaction, of such documents as I have deemed necessary or appropriate as a basis for the opinions set forth herein, including (i) the Registration Statement; (ii) the Restated Certificate of Incorporation and By-laws of Occidental, in each case, as amended to date (the "Certificate" and "By-laws", respectively); (iii) the Senior Indenture; (iv) the form of underwriting agreement filed as an exhibit to the Registration Statement to be entered into by Occidental and one or more underwriters to be named in connection with any underwritten offering of debt securities; and (v) certain resolutions adopted by the Board of Directors of Occidental relating to the execution of the Senior Indenture, the issuance of the Senior Debt Securities, the filing of the Registration Statement and any amendments or supplements thereto and related matters (the "Board Resolutions").

        I have also examined originals or copies, certified or otherwise identified to my satisfaction, of such records of Occidental and such agreements, certificates and receipts of public officials, certificates of officers or other representatives of Occidental and others, and such other documents as I have deemed necessary or appropriate as a basis for the opinions set forth below.

        I am familiar with the proceedings taken and proposed to be taken by Occidental in connection with the authorization and issuance of the Senior Debt Securities and, for the purposes of this opinion, have assumed such proceedings will be timely completed in the manner presently proposed and that the terms of each issuance will otherwise be in compliance with law. In my examination, I have assumed the legal capacity of all natural persons, the genuineness of all signatures (other than signatures executing documents on behalf of Occidental), the authenticity of all documents submitted to me as originals, the conformity to original documents of all documents submitted to me as certified or photostatic copies, and the authenticity of the originals of such copies. In making my examination of executed documents, I have assumed that the parties thereto, other than Occidental, had the power,

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corporate or other, to enter into and perform all obligations thereunder and have also assumed the due authorization by all requisite action, corporate or other, and the execution and delivery by such parties of such documents and the validity and binding effect thereof on such parties. As to any facts material to the opinions expressed herein which I have not independently established or verified, I have relied upon statements and representations of officers and other representatives of Occidental and others. Also, I have relied, as to certain legal matters, on advice of other lawyers employed by Occidental who are more familiar with such matters.

        I am a member of the California and New York Bars and for purposes of this opinion do not hold myself out as an expert on, nor do I express any opinion as to, the laws of any jurisdiction other than the laws of the State of New York, the Federal laws of the United States and the corporation laws of the State of Delaware. The Senior Debt Securities may be issued from time to time on a delayed or continuous basis and the opinions expressed herein are based on laws in effect on the date hereof, which laws are subject to change with possible retroactive effect.

        Based upon and subject to the foregoing and subject to the limitations, qualifications, exceptions and assumptions set forth herein, I am of the opinion that, with respect to any series of Senior Debt Securities, when (i) the Registration Statement becomes effective under the Securities Act; (ii) the appropriate officers of Occidental have taken all necessary action pursuant to the provisions of the Senior Indenture to fix and approve the terms of the Senior Debt Securities, including the establishment of the form or forms of certificates representing the Senior Debt Securities pursuant to the provisions of the Senior Indenture; (iii) the Senior Debt Securities are duly executed and authenticated in accordance with the provisions of the Senior Indenture and duly delivered to the purchasers thereof upon payment of the agreed upon consideration therefor; and (iv) if the Senior Debt Securities are to be sold pursuant to a firm commitment underwritten offering, an underwriting agreement with respect to the Senior Debt Securities has been duly authorized, executed and delivered by Occidental and the other parties thereto, then the Senior Debt Securities will be validly issued and binding obligations of Occidental, enforceable against Occidental in accordance with their terms, except: (x) as may be subject to or limited by (a) bankruptcy, insolvency, reorganization, moratorium or other similar laws now or hereafter in effect affecting creditors' rights generally, (b) the effect of general principles of equity, including, without limitation, concepts of materiality, reasonableness, good faith and fair dealing and the possible unavailability of specific performance or injunctive relief, regardless of whether considered in a proceeding in equity or at law, (c) the applicability or effect of any fraudulent transfer, preference or similar law, (d) requirements that a claim with respect to any Senior Debt Securities authenticated and delivered under the applicable Indenture denominated other than in United States dollars (or a judgment denominated other than in United States dollars in respect of such claim) be converted into United States dollars at a rate of exchange prevailing on a date determined pursuant to applicable law, (e) acts of a governmental authority to limit, delay or prohibit the making of payments outside the United States or in a foreign currency, composite currency or currency unit, and (f) the effect of general rules of contract law that limit the enforceability of provisions requiring indemnification of a party for liability for its own action or inaction to the extent the action or inaction involves gross negligence, recklessness, willful misconduct or unlawful conduct; and (y) that the waiver contained in Section 515 of the Senior Indenture may be deemed unenforceable.

        The opinion above is limited to the internal laws of the State of New York.

        I call to your attention that federal courts located in New York could decline to hear a case on grounds of forum non-conveniens or any doctrine limiting the availability of the federal courts in New York as a forum for the resolution of disputes not having a sufficient nexus to New York, and I express no opinion as to any waiver of rights to assert the applicability of the forum non-conveniens doctrine or any such other doctrine.

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        My opinion above with respect to the enforceability of the choice of New York law and choice of New York forum provisions of the Senior Indenture and the Senior Debt Securities is rendered in reliance upon the Act of July 19, 1984, ch. 421, 1984 McKinney's Sess. Laws of N.Y. 1406 (codified at N.Y. Gen. Oblig. Law Sections 5-1401, 5-1402 (McKinney 1989) and N.Y. CPLR 327(b) (McKinney (1990)) (the "Act") and is subject to the qualifications that such enforceability (i) may be limited by public policy considerations of any jurisdiction, other than the courts of the State of New York, in which enforcement of such provisions, or of a judgment upon an agreement containing such provisions, is sought, and (ii) as specified in the Act, does not apply to the extent provided to the contrary in subsection two of Section 1-105 of the New York Uniform Commercial Code.

        I hereby consent to the filing of this opinion with the Commission as Exhibit 5.1 to the Registration Statement. I also consent to the reference to me under the heading "Legal Opinions" in the Registration Statement. In giving this consent, I do not thereby admit that I am in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission.

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Exhibit 5.1

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Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

To the Board of Directors
Occidental Petroleum Corporation:

        We consent to the use of our reports with respect to the consolidated financial statements and the related financial statement schedule, and the effectiveness of internal control over financial reporting incorporated by reference herein and to the reference to our firm under the heading "Experts" in the prospectus. Our report on the financial statements of Occidental Petroleum Corporation refers to changes in the method of accounting for uncertain tax positions (2007), defined benefit pension and other postretirement plans (2006) and share-based payments (2005).

/s/ KPMG LLP

Los Angeles, California
August 11, 2008

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Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

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EXHIBIT 23.2

EXPERT CONSENT

To the Board of Directors
Occidental Petroleum Corporation:

        We consent to the use of our letter dated February 4, 2008, relating to our review of the procedures and methods used by Occidental in its oil and gas proved reserves estimation process, which information is included in Occidental's Annual Report on Form 10-K for the year ended December 31, 2007, which is incorporated by reference in this prospectus, and to the references to our name under the heading "Experts" in this prospectus.

/s/ RYDER SCOTT COMPANY, L.P.

Houston, Texas
August 11, 2008

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EXHIBIT 23.2

EXPERT CONSENT