================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

        DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED) APRIL 26, 2005

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

            DELAWARE                     1-9210              95-4035997
  (State or other jurisdiction        (Commission         (I.R.S. Employer
        of incorporation)             File Number)       Identification No.)

              10889 WILSHIRE BOULEVARD
              LOS ANGELES, CALIFORNIA                             90024
      (Address of principal executive offices)                 (ZIP code)

               Registrant's telephone number, including area code:
                                 (310) 208-8800

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Check the appropriate box below if the Form 8-K is intended to simultaneously
satisfy the filing obligation of the Registrant under any of the following
provisions (see General Instruction A.2. below):

[   ]  Written communications pursuant to Rule 425 under the Securities Act (17
CFR 230.425)

[   ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
CFR 240.14a-12)

[   ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
Exchange Act (17 CFR 240.14d-2(b))

[   ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
Exchange Act (17 CFR 240.13e-4(c))

SECTION 2 - FINANCIAL INFORMATION Item 2.02. Results of Operations and Financial Condition - ---------- --------------------------------------------- On April 26, 2005, Occidental Petroleum Corporation released information regarding its results of operations for the fiscal period ended March 31, 2005. The exhibits to this Form 8-K and the information set forth in this Item 2.02 are being furnished pursuant to Item 2.02, Results of Operations and Financial Condition. The full text of the press release is attached to this report as Exhibit 99.1. The full text of the speeches given by Dr. Ray R. Irani and Stephen I. Chazen are attached to this report as Exhibit 99.2. Investor Relations Supplemental Schedules are attached to this report as Exhibit 99.3.

SECTION 8 - OTHER EVENTS Item 8.01. Other Events - ---------- ------------ On April 26, 2005, Occidental Petroleum Corporation announced net income for the first quarter 2005 of $846 million ($2.11 per share), compared with $487 million ($1.24 per share) for the first quarter 2004. Core earnings for the first quarter 2005 were $866 million ($2.16 per share), compared with $476 million ($1.22 per share) for the same period in 2004. Oil and Gas ----------- Oil and gas segment earnings were a record $1.3 billion for the first quarter 2005, which was 47 percent higher than the $915 million in earnings for the first quarter 2004. The first quarter 2005 earnings reflected a $529 million improvement from the impact of higher energy prices, partially offset by higher operating expenses and increased DD&A rates. For the quarter, oil and gas production averaged 565,000 barrels of oil equivalent, which was essentially flat with the 568,000 equivalent barrels per day produced in the first quarter 2004, and up slightly compared to the fourth quarter 2004 rate of 558,000 equivalent barrels per day. Compared to a year ago, production under the company's production sharing contracts in Oman, Qatar, Yemen and Long Beach was negatively impacted by higher prices. The average price for West Texas Intermediate crude oil in the first quarter 2005 was $49.84 per barrel compared to $35.15 per barrel in the first quarter 2004. If prices had remained at first quarter 2004 levels, production in the first quarter 2005 would have been more than 13,000 equivalent barrels per day higher. Earlier this year, Occidental's executive management said that it expected to exit 2005 with a production level of approximately 600,000 equivalent barrels per day. That expectation is unchanged. At the end of the first quarter, Occidental completed two acquisitions in the Permian Basin. These acquisitions are expected to contribute 10,000 equivalent barrels per day to the 2005 production exit rate and keep the company on track in meeting its year-end production target. Chemicals --------- Chemical segment earnings were $214 million for the first quarter 2005, nearly four times higher than the $56 million earned in the first quarter 2004. The improvement was due to higher margins in all major products resulting from higher sales prices, partially offset by higher energy and feedstock costs. Financial --------- During the first quarter, $450 million of 7.65 percent senior notes were redeemed with a related charge of $10 million to interest expense. At March 31, Occidental's debt was $3.5 billion compared to $3.9 billion at the end of 2004. After taking into account the $450 million in debt retirement costs and $300 million in acquisition costs, the company had cash and short-term investments of $1.4 billion at the end of the quarter, which was approximately the same level as the end of 2004. Stockholders' equity was $11.2 billion, up by nearly $700 million compared to year-end 2004. Statements in this presentation that contain words such as "will," "expect" or "estimate," or otherwise relate to the future, are forward-looking and involve risks and uncertainties that could significantly affect expected results. Factors that could cause results to differ materially include, but are not limited to: exploration risks such as drilling of unsuccessful wells, global commodity pricing fluctuations and supply/demand considerations for oil, gas and chemicals; higher-than-expected costs; political risk; and not successfully completing (or any material delay in) any expansion, capital expenditure, acquisition, or disposition. Occidental disclaims any obligation to update any forward-looking statements. 2

SUMMARY OF SEGMENT NET SALES AND EARNINGS First Quarter --------------------- (In millions, except per-share amounts) 2005 2004(c) ======================================== ======== ======== SEGMENT NET SALES Oil and Gas $ 2,219 $ 1,693 Chemical 1,061 834 Other 23 30 -------- -------- Net sales $ 3,303 $ 2,557 ======================================== ======== ======== SEGMENT EARNINGS Oil and Gas $ 1,349 $ 915 Chemical 214 56 -------- -------- 1,563 971 Unallocated Corporate Items Interest expense, net (a) (61) (68) Income taxes (b) (601) (363) Other (51) (51) -------- -------- Income from Continuing Operations 850 489 Discontinued operations, net (4) (2) -------- -------- NET INCOME $ 846 $ 487 ======== ======== BASIC EARNINGS PER COMMON SHARE Income from continuing operations $ 2.12 $ 1.25 Discontinued operations, net (.01) (.01) -------- -------- $ 2.11 $ 1.24 ======== ======== DILUTED EARNINGS PER COMMON SHARE Income from continuing operations $ 2.09 $ 1.24 Discontinued operations, net (.01) (.01) -------- -------- $ 2.08 $ 1.23 ======== ======== AVERAGE BASIC COMMON SHARES OUTSTANDING 400.4 391.5 ======================================== ======== ======== See footnotes on following page. 3

(a) The first quarter 2005 includes a $10 million pre-tax interest charge to redeem all the outstanding 7.65 percent senior notes, which were due in February 2006. The first quarter 2004 includes an $11 million pre-tax interest charge to redeem all the outstanding 8.16 percent Trust Preferred Redeemable Securities. (b) The first quarter 2005 includes a $10 million charge, net, related to a state income tax issue. The first quarter 2004 includes a $20 million credit related to the settlement of an issue with the Internal Revenue Service. (c) As of January 1, 2005, Occidental revised its reporting of segment earnings to show segment earnings before income taxes. All domestic and foreign income tax expense is now reflected under Unallocated Corporate Items in the income taxes line. This reporting change has been retrospectively applied to prior period results. SUMMARY OF CAPITAL EXPENDITURES AND DD&A EXPENSE First Quarter --------------------- ($ millions) 2005 2004 =================================== ======== ======== CAPITAL EXPENDITURES $ 536 $ 343 ======== ======== DEPRECIATION, DEPLETION AND AMORTIZATION OF ASSETS $ 344 $ 324 =================================== ======== ======== 4

SUMMARY OF OPERATING STATISTICS First Quarter --------------------- 2005 2004 =================================== ======== ======== NET OIL, GAS AND LIQUIDS PRODUCTION PER DAY United States Crude oil and liquids (MBBL) California 77 77 Permian 148 153 Horn Mountain 18 25 Hugoton 4 3 -------- -------- Total 247 258 Natural Gas (MMCF) California 241 243 Hugoton 129 127 Permian 146 140 Horn Mountain 12 17 -------- -------- Total 528 527 Latin America Crude oil (MBBL) Colombia 32 36 Ecuador 42 43 -------- -------- Total 74 79 Middle East Crude oil (MBBL) Oman 23 14 Qatar 43 42 Yemen 35 39 -------- -------- Total 101 95 Natural Gas (MMCF) Oman 56 11 Other Eastern Hemisphere Crude oil (MBBL) Pakistan 5 9 Natural Gas (MMCF) Pakistan 78 75 BARRELS OF OIL EQUIVALENT (MBOE) - -------------------------------- Subtotal consolidated subsidiaries 537 543 Colombia-minority interest (4) (4) Russia-Occidental net interest 30 28 Yemen-Occidental net interest 2 1 -------- -------- TOTAL WORLDWIDE PRODUCTION 565 568 =================================== ======== ======== 5

SIGNIFICANT TRANSACTIONS AND EVENTS AFFECTING EARNINGS Occidental's results of operations often include the effects of significant transactions and events affecting earnings that vary widely and unpredictably in nature, timing and amount. Therefore, management uses a measure called "core earnings," which excludes those items. This non-GAAP measure is not meant to disassociate those items from management's performance, but rather is meant to provide useful information to investors interested in comparing Occidental's earnings performance between periods. Reported earnings are considered representative of management's performance over the long term. Core earnings is not considered to be an alternative to operating income in accordance with generally accepted accounting principles. The following table sets forth the core earnings and significant items affecting earnings for each operating segment and corporate: First Quarter ($ millions, except ----------------------------------------------- per-share amounts) 2005 EPS 2004 EPS =================================== ======== ======== ======== ======== TOTAL REPORTED EARNINGS $ 846 $ 2.11 $ 487 $ 1.24 ======== ======== ======== ======== OIL AND GAS Segment Earnings $ 1,349 $ 915 Less: None -- -- -------- -------- Segment Core Earnings $ 1,349 $ 915 -------- -------- CHEMICALS Segment Earnings $ 214 $ 56 Less: None -- -- -------- -------- Segment Core Earnings $ 214 $ 56 -------- -------- CORPORATE Results $ (717) $ (484) Less: Trust preferred redemption charge -- (11) 7.65% debt redemption charge (10) -- Settlement of tax issues -- 20 State tax charge (10) -- Tax effect of pre-tax adjustments 4 4 Discontinued operations, net* (4) (2) -------- -------- Corporate Core Results $ (697) $ (495) -------- -------- TOTAL CORE EARNINGS $ 866 $ 2.16 $ 476 $ 1.22 =================================== ======== ======== ======== ======== * These amounts are shown after-tax. 6

ITEMS AFFECTING COMPARABILITY OF CORE EARNINGS BETWEEN PERIODS The item(s) below are included in core earnings but are shown in this table because they affect the comparability of core earnings between periods. First Quarter --------------------- ($ millions) 2005 2004 =================================== ======== ======== PRE-TAX INCOME / (EXPENSE) Corporate Environmental remediation (9) -- 7

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. OCCIDENTAL PETROLEUM CORPORATION (Registrant) DATE: April 26, 2005 S. P. Dominick, Jr. -------------------------------------------------- S. P. Dominick, Jr., Vice President and Controller (Chief Accounting and Duly Authorized Officer)

EXHIBIT INDEX 99.1 Press release dated April 26, 2005. 99.2 Full text of speeches given by Dr. Ray R. Irani and Stephen I. Chazen 99.3 Investor Relations Supplemental Schedules

                                                                    EXHIBIT 99.1


            ====================================================================
[OXY LOGO]  NEWS RELEASE                        OCCIDENTAL PETROLEUM CORPORATION
            ====================================================================
         10889 Wilshire Boulevard, Los Angeles, California 90024  (310) 208-8800

For Immediate Release: April 26, 2005

                  OCCIDENTAL PETROLEUM ANNOUNCES RECORD QUARTER
                  ---------------------------------------------

     LOS ANGELES -- Occidental Petroleum Corporation (NYSE: OXY) announced net
income for the first quarter 2005 of $846 million ($2.11 per share), compared
with $487 million ($1.24 per share) for the first quarter 2004. Core earnings
for the first quarter 2005 were $866 million ($2.16 per share), compared with
$476 million ($1.22 per share) for the same period in 2004.

     In announcing the results, Dr. Ray R. Irani, chairman, president and chief
executive officer, said, "Strong oil and gas prices and improved chemical
margins were key drivers in the 74 percent increase in net income compared to
our performance a year ago, resulting in the highest quarterly income in the
company's history."

                                   OIL AND GAS
                                   -----------

     Oil and gas segment earnings were a record $1.3 billion for the first
quarter 2005, which was 47 percent higher than the $915 million in earnings for
the first quarter 2004. The first quarter 2005 earnings reflected a $529 million
improvement from the impact of higher energy prices, partially offset by higher
operating expenses and increased DD&A rates.

     For the quarter, oil and gas production averaged 565,000 barrels of oil
equivalent, which was essentially flat with the 568,000 equivalent barrels per
day produced in the first quarter 2004, and up slightly compared to the fourth
quarter 2004 rate of 558,000 equivalent barrels per day. Compared to a year ago,
production under the company's production sharing contracts in Oman, Qatar,
Yemen and Long Beach was negatively impacted by higher prices. The average price
for West Texas Intermediate crude oil in the first quarter 2005 was $49.84 per
barrel compared to $35.15 per barrel in the first quarter 2004. If prices had
remained at first quarter 2004 levels, production in the first quarter 2005
would have been more than 13,000 equivalent barrels per day higher.

     Earlier this year, Occidental's executive management said that it expected
to exit 2005 with a production level of approximately 600,000 equivalent barrels
per day. That expectation is unchanged.

At the end of the first quarter, Occidental completed two acquisitions in the Permian Basin. These acquisitions are expected to contribute 10,000 equivalent barrels per day to the 2005 production exit rate and keep the company on track in meeting its year-end production target. CHEMICALS --------- Chemical segment earnings were $214 million for the first quarter 2005, nearly four times higher than the $56 million earned in the first quarter 2004. The improvement was due to higher margins in all major products resulting from higher sales prices, partially offset by higher energy and feedstock costs. FINANCIAL --------- During the first quarter, $450 million of 7.65 percent senior notes were redeemed with a related charge of $10 million to interest expense. At March 31, Occidental's debt was $3.5 billion compared to $3.9 billion at the end of 2004. After taking into account the $450 million in debt retirement costs and $300 million in acquisition costs, the company had cash and short-term investments of $1.4 billion at the end of the quarter, which was approximately the same level as the end of 2004. Stockholders' equity was $11.2 billion, up by nearly $700 million compared to year-end 2004. Statements in this presentation that contain words such as "will," "expect" or "estimate," or otherwise relate to the future, are forward-looking and involve risks and uncertainties that could significantly affect expected results. Factors that could cause results to differ materially include, but are not limited to: exploration risks such as drilling of unsuccessful wells, global commodity pricing fluctuations and supply/demand considerations for oil, gas and chemicals; higher-than-expected costs; political risk; and not successfully completing (or any material delay in) any expansion, capital expenditure, acquisition, or disposition. Occidental disclaims any obligation to update any forward-looking statements. -0- Contacts: Lawrence P. Meriage (media) 310-443-6562 Kenneth J. Huffman (investors) 212-603-8183 For further analysis of Occidental's performance, please visit the website: www.oxy.com 2

SUMMARY OF SEGMENT NET SALES AND EARNINGS First Quarter --------------------- (In millions, except per-share amounts) 2005 2004(c) ======================================== ======== ======== SEGMENT NET SALES Oil and Gas $ 2,219 $ 1,693 Chemical 1,061 834 Other 23 30 -------- -------- Net sales $ 3,303 $ 2,557 ======================================== ======== ======== SEGMENT EARNINGS Oil and Gas $ 1,349 $ 915 Chemical 214 56 -------- -------- 1,563 971 Unallocated Corporate Items Interest expense, net (a) (61) (68) Income taxes (b) (601) (363) Other (51) (51) -------- -------- Income from Continuing Operations 850 489 Discontinued operations, net (4) (2) -------- -------- NET INCOME $ 846 $ 487 ======== ======== BASIC EARNINGS PER COMMON SHARE Income from continuing operations $ 2.12 $ 1.25 Discontinued operations, net (.01) (.01) -------- -------- $ 2.11 $ 1.24 ======== ======== DILUTED EARNINGS PER COMMON SHARE Income from continuing operations $ 2.09 $ 1.24 Discontinued operations, net (.01) (.01) -------- -------- $ 2.08 $ 1.23 ======== ======== AVERAGE BASIC COMMON SHARES OUTSTANDING 400.4 391.5 ======================================== ======== ======== See footnotes on following page. 3

(a) The first quarter 2005 includes a $10 million pre-tax interest charge to redeem all the outstanding 7.65 percent senior notes, which were due in February 2006. The first quarter 2004 includes an $11 million pre-tax interest charge to redeem all the outstanding 8.16 percent Trust Preferred Redeemable Securities. (b) The first quarter 2005 includes a $10 million charge, net, related to a state income tax issue. The first quarter 2004 includes a $20 million credit related to the settlement of an issue with the Internal Revenue Service. (c) As of January 1, 2005, Occidental revised its reporting of segment earnings to show segment earnings before income taxes. All domestic and foreign income tax expense is now reflected under Unallocated Corporate Items in the income taxes line. This reporting change has been retrospectively applied to prior period results. SUMMARY OF CAPITAL EXPENDITURES AND DD&A EXPENSE First Quarter --------------------- ($ millions) 2005 2004 =================================== ======== ======== CAPITAL EXPENDITURES $ 536 $ 343 ======== ======== DEPRECIATION, DEPLETION AND AMORTIZATION OF ASSETS $ 344 $ 324 =================================== ======== ======== 4

SUMMARY OF OPERATING STATISTICS First Quarter --------------------- 2005 2004 =================================== ======== ======== NET OIL, GAS AND LIQUIDS PRODUCTION PER DAY United States Crude oil and liquids (MBBL) California 77 77 Permian 148 153 Horn Mountain 18 25 Hugoton 4 3 -------- -------- Total 247 258 Natural Gas (MMCF) California 241 243 Hugoton 129 127 Permian 146 140 Horn Mountain 12 17 -------- -------- Total 528 527 Latin America Crude oil (MBBL) Colombia 32 36 Ecuador 42 43 -------- -------- Total 74 79 Middle East Crude oil (MBBL) Oman 23 14 Qatar 43 42 Yemen 35 39 -------- -------- Total 101 95 Natural Gas (MMCF) Oman 56 11 Other Eastern Hemisphere Crude oil (MBBL) Pakistan 5 9 Natural Gas (MMCF) Pakistan 78 75 BARRELS OF OIL EQUIVALENT (MBOE) - -------------------------------- Subtotal consolidated subsidiaries 537 543 Colombia-minority interest (4) (4) Russia-Occidental net interest 30 28 Yemen-Occidental net interest 2 1 -------- -------- TOTAL WORLDWIDE PRODUCTION 565 568 =================================== ======== ======== 5

SIGNIFICANT TRANSACTIONS AND EVENTS AFFECTING EARNINGS Occidental's results of operations often include the effects of significant transactions and events affecting earnings that vary widely and unpredictably in nature, timing and amount. Therefore, management uses a measure called "core earnings," which excludes those items. This non-GAAP measure is not meant to disassociate those items from management's performance, but rather is meant to provide useful information to investors interested in comparing Occidental's earnings performance between periods. Reported earnings are considered representative of management's performance over the long term. Core earnings is not considered to be an alternative to operating income in accordance with generally accepted accounting principles. The following table sets forth the core earnings and significant items affecting earnings for each operating segment and corporate: First Quarter ($ millions, except ----------------------------------------------- per-share amounts) 2005 EPS 2004 EPS =================================== ======== ======== ======== ======== TOTAL REPORTED EARNINGS $ 846 $ 2.11 $ 487 $ 1.24 ======== ======== ======== ======== OIL AND GAS Segment Earnings $ 1,349 $ 915 Less: None -- -- -------- -------- Segment Core Earnings $ 1,349 $ 915 -------- -------- CHEMICALS Segment Earnings $ 214 $ 56 Less: None -- -- -------- -------- Segment Core Earnings $ 214 $ 56 -------- -------- CORPORATE Results $ (717) $ (484) Less: Trust preferred redemption charge -- (11) 7.65% debt redemption charge (10) -- Settlement of tax issues -- 20 State tax charge (10) -- Tax effect of pre-tax adjustments 4 4 Discontinued operations, net* (4) (2) -------- -------- Corporate Core Results $ (697) $ (495) -------- -------- TOTAL CORE EARNINGS $ 866 $ 2.16 $ 476 $ 1.22 =================================== ======== ======== ======== ======== * These amounts are shown after-tax. 6

ITEMS AFFECTING COMPARABILITY OF CORE EARNINGS BETWEEN PERIODS The item(s) below are included in core earnings but are shown in this table because they affect the comparability of core earnings between periods. First Quarter --------------------- ($ millions) 2005 2004 =================================== ======== ======== PRE-TAX INCOME / (EXPENSE) Corporate Environmental remediation (9) -- 7

                                                                    EXHIBIT 99.2


                        OCCIDENTAL PETROLEUM CORPORATION

                                DR. RAY R. IRANI
                      CHAIRMAN AND CHIEF EXECUTIVE OFFICER

                               - CONFERENCE CALL -
                    FIRST QUARTER 2005 EARNINGS ANNOUNCEMENT

                                 APRIL 26, 2005
                             Los Angeles, California

     Good morning and thank you for joining us.

     As Steve Chazen will discuss in some detail shortly, the momentum we
developed last year has carried over into the first quarter, resulting in net
income of $846 million, the highest quarterly earnings in Oxy's history. Our
results were driven by record high quarterly oil and gas earnings and improving
earnings from our chemicals business.

     Earlier this year I said that we expected to exit 2005 with an oil and gas
production rate of around 600,000 barrels of oil equivalent per day. That
expectation is unchanged. Let me tell you why.

     As you saw in our announcement, our oil and gas production for the quarter
averaged 565,000 barrels of oil equivalent per day.  At the end of the quarter,
we completed two Permian acquisitions for a total purchase price of $300
million. We expect these assets, which are two-thirds gas, to add production of
40 million cubic feet of gas per day and 3,300 barrels of oil per day - for a
combined year-end exit rate of 10,000 equivalent barrels per day.

     In addition, we currently are in the advanced stages of negotiations for a
larger Permian acquisition.  We expect this acquisition to add


                                       1

approximately 16,000 equivalent barrels per day to our year-end exit rate. We expect to have more to say about this within the next month. The combined production from these acquisitions, when added to our first quarter production of 565,000 equivalent barrels per day, would raise our total production when fully operational to 591,000 equivalent barrels per day. And, this will put us well within reach of our projected year-end exit rate of 600,000 equivalent barrels per day. The combined reserves for both the small and large acquisitions are expected to be at least 130 million equivalent barrels. So I am comfortable in stating that we will more than replace our 2005 production. Now let's turn briefly to two major international projects - the Dolphin Gas Project in the Middle East and the new exploration venture in Libya. These two projects have one important element in common - our strategic partnership with the Government of Abu Dhabi. We believe that Oxy is the only oil and gas company to have a business alliance with a major oil producing nation in the Middle East. Oxy has a 24.5 percent interest in the Dolphin project which is moving forward toward its expected start date in late 2006. Today we can share with you the news that commitments are in place for the full two billion cubic feet of gas per day for the first phase of the project. Furthermore, we and our partners are working to secure contracts for the sale of an additional billion cubic feet per day. The second phase of this project, which will take production from two to three billion cubic feet per day, is expected to come on stream in 2009 - 2010. The Government of Abu Dhabi holds a 51 percent majority interest in Dolphin. As you probably know, Oxy was the big winner in Libya's first exploration bid round since the U.S. lifted sanctions in April 2004. Oxy 2

holds an interest in nine of the fifteen blocks that were awarded. We expect work on the new blocks to begin soon, starting with the acquisition of additional seismic data. Drilling could begin next year. The Government of Abu Dhabi holds a 10 percent interest in each of the nine blocks through its ownership of Liwa Energy. We expect our alliance with Abu Dhabi to play an important role in Oxy's model for future growth in the region. Let me close my remarks by summarizing the financial impact on Oxy of yesterday's announced sale of Premcor to Valero Energy. Oxy owned just over 9 million shares of Premcor at the end of the first quarter. At the deal price of $73.25 per share, Oxy would realize cash proceeds of approximately $480 million after taxes. This will result in a net gain of approximately $360 million after taxes, or approximately $0.90 per share - based on Oxy's outstanding shares at the end of the first quarter. I'll now turn the call over to Steve Chazen who will discuss the details of Occidental's record performance. 3

OCCIDENTAL PETROLEUM CORPORATION STEPHEN CHAZEN SENIOR EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER - CONFERENCE CALL - FIRST QUARTER 2005 EARNINGS ANNOUNCEMENT APRIL 26, 2005 Los Angeles, California Thank you, Ray. Those of you who have not received a copy of the press release announcing our first quarter earnings, along with the Investor Relations Supplemental Schedules, can find them on our website - www.oxy.com or on the SEC's EDGAR site. Net income for the quarter was $846 million, 74 percent higher than the $487 million we earned in the first quarter last year. Earnings per share for the quarter were $2.11, compared to last year's $1.24 per share. The quarter- to-quarter improvement was due primarily to higher oil and natural gas prices and higher chemicals margins. The 2005 results included a one-time after-tax charge of $6 million associated with debt retirement and a $10 million tax charge. The 2004 first quarter reflected a net benefit of $13 million for a tax credit partly offset by a debt retirement charge. On a core income basis, our first quarter 2005 EPS was $2.16 versus an EPS of $1.22 in 2004. In 2004, when Oxy elected to credit foreign taxes instead of deducting them, we began disclosing our worldwide effective tax rate and provided a supplemental schedule showing how it is calculated. Effective with the first quarter of 2005, we will no longer show foreign income taxes in the oil and 4

gas segment. Instead, we will show all income taxes - federal, state and foreign - - in the Corporate Other section of our financial statistics in the income tax line. Segment results for prior periods will reflect the retrospective application of this change, as required by the accounting standard governing segment reporting. There is no change in net income. Tables showing the quarterly numbers recalculated on a pre-tax basis are included in the Investor Relations Supplemental Schedules. On a segment basis, oil and gas first quarter earnings were $1.35 billion, compared to $915 million for the first quarter of 2004. o Worldwide oil and gas daily production for the quarter averaged 565,000 barrels of oil equivalent. This was essentially flat compared with the 568,000 equivalent barrels per day we produced in last year's first quarter, and up slightly compared to the fourth quarter rate of 558,000 equivalent barrels. o As we have discussed before, under our production sharing agreements, prices have an impact on volumes. For example, if prices had remained at first quarter 2004 levels, this year's net first quarter production would have been more than 13,000 barrels per day higher. o The WTI price averaged $49.84 per barrel for the first quarter compared with $35.15 for the comparable period last year, which is an increase of about 42 percent. o First quarter production costs were $7.77 per equivalent barrel compared to average costs of $6.95 in 2004. There are a number of items that have impacted costs in the current quarter. Increased production-related taxes and rising utility costs are the result of 5

higher oil and gas prices. Workover and maintenance costs also are higher than last year. o Our DD&A rate also is higher mainly due to the accelerated drilling of wells in Elk Hills and Yemen and a major facilities expansion project in Qatar. o The average NYMEX gas price for the quarter was $6.89 per million BTUs, up 18 percent from last year's first quarter average of $5.84. Chemical segment earnings were $214 million, nearly 4 times higher than the $56 million we earned in last year's first quarter. The primary factor driving the improvement was higher margins for all our major products resulting from higher prices, partially offset by higher feedstock and energy costs. During the quarter, cash from operations was approximately $1.2 billion. We spent $300 million on acquisitions and we retired $450 million of 7.65 percent Senior Notes which were due in 2006. After accounting for the acquisitions and the debt retirement, the strong cash flow from our business segments left Oxy with $1.4 billion of cash and short-term investments at the quarter's end. Our strong cash position speaks to Oxy's overall financial strength and flexibility. Turning to the balance sheet, we increased shareholders' equity by $700 million to $11.2 billion. As a result of the $450 million debt retirement, total debt was down at the end of the quarter to $3.5 billion, compared to $3.9 billion at the end of last year. Base interest expense for the quarter was $51 million compared to $57 million during the first quarter of 2004. Our annual run rate going forward is $200 million. 6

Capital spending for the quarter was $536 million compared to $343 million in last year's first quarter. Oil and gas accounted for $506 million of this year's expenditures, including approximately $90 million for exploration lease bonuses in Libya. We're running slightly ahead of our capital forecast of $2.1 billion for the year, so we're raising our forecast by $100 million to $2.2 billion. As we look ahead in the second quarter: o After taking account of the acquisitions Ray mentioned, and scheduled pipeline maintenance during the quarter at Horn Mountain, which is expected to result in total downtime of 20 days, we expect production to be up slightly compared to the first quarter. As Ray noted, two- thirds of the production from these acquisitions is gas, and there is a one month lag in the accounting for gas production. Therefore, we can expect third quarter production to be higher than the second quarter. And, as I discussed earlier, production could vary due to price-driven adjustments in the volumes under our production sharing contracts in Oman, Qatar, Yemen and Long Beach. o We expect exploration expense for the quarter to be about $70 million. o We expect second quarter chemical earnings to be similar to the first quarter, which compares favorably to the $92 million we earned in last year's second quarter. We see no weakening in demand or margin slippage for our major chemical products. o We expect to close the Vulcan acquisition late in the second quarter. This transaction will be immediately accretive to earnings. 7

o A $1.00 per barrel change in oil prices impacts segment quarterly earnings by about $36 million. The average WTI price in the first quarter was $49.84. We expect our realized domestic gas price to be approximately $6.10 per million cubic feet. o Both our U.S. and foreign tax rates are included in the "Investor Relations Supplemental Schedule". Our worldwide effective tax rate for the first quarter was 41 percent. We expect our second quarter rate to be in the same range. Now we're ready for your questions. - -------------------------------------------------------------------------------- See the investor relations supplemental schedules for the reconciliation of non-GAAP items. Statements in this presentation that contain words such as "will", "expect" or "estimate", or otherwise relate to the future, are forward-looking and involve risks and uncertainties that could significantly affect expected results. Factors that could cause results to differ materially include, but are not limited to: exploration risks such as drilling of unsuccessful wells; global commodity pricing fluctuations and supply/demand considerations for oil, gas and chemicals; higher-than-expected costs; political risk; and not successfully completing (or any material delay in) any expansion, capital expenditure, acquisition, or disposition. Occidental disclaims any obligation to update any forward-looking statements. The United States Securities and Exchange Commission (SEC) permits oil and natural gas companies, in their filings with the SEC, to disclose only proved reserves demonstrated by actual production or conclusive formation tests to be economically producible under existing economic and operating conditions. We use certain terms in this presentation, such as probable, possible and recoverable reserves, that the SEC's guidelines strictly prohibit us from using in filings with the SEC. U.S. investors are urged to consider carefully the disclosure in our Form 10-K, available through the following toll- free telephone number, 1-888-OXYPETE (1-888-699-7383) or on the Internet at http://www.oxy.com. You also can obtain a copy from the SEC by calling 1-800-SEC-0330. 8

                                                                    EXHIBIT 99.3


Investor Relations Supplemental Schedules
[OXY LOGO]


                              OCCIDENTAL PETROLEUM
                               2005 First Quarter
                                Net Income (Loss)
                                  ($ millions)



                                           REPORTED                                                               CORE
                                            INCOME         SIGNIFICANT ITEMS AFFECTING INCOME                   EARNINGS
                                          ----------       ----------------------------------                  ----------
                                                                                                   
Oil & Gas                                 $    1,349                                                           $    1,349

Chemical                                         214                                                                  214

Corporate
  Interest expense, net                          (61)              10       7.65% note redemption charge              (51)
  Other                                          (51)                                                                 (51)
  Taxes                                         (601)              (4)      Tax effect of adjustments                (595)
                                                                   10       State tax charge
                                          ----------       ----------                                          ----------
INCOME FROM CONTINUING OPERATIONS                850               16                                                 866
Discontinued operations, net of tax               (4)               4       Discontinued operations, net               --
                                          ----------       ----------                                          ----------
NET INCOME                                $      846       $       20                                          $      866
                                          ==========       ==========                                          ==========


BASIC EARNINGS PER COMMON SHARE
Income from continuing operations         $     2.12                                                           $     2.16
Discontinued operations, net of tax            (0.01)                                                                  --
                                          ----------                                                           ----------
Net Income                                $     2.11                                                           $     2.16
                                          ==========                                                           ==========



                                                                               1

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM 2004 First Quarter Net Income (Loss) ($ millions) REPORTED CORE INCOME SIGNIFICANT ITEMS AFFECTING INCOME EARNINGS ---------- ---------------------------------- ---------- Oil & Gas $ 915 $ 915 Chemical 56 56 Corporate Interest expense, net (68) 11 Trust preferred redemption (57) Other (51) (51) Taxes (363) (20) Tax settlements (387) (4) Tax effect of adjustments ---------- ---------- ---------- INCOME FROM CONTINUING OPERATIONS 489 (13) 476 Discontinued operations, net of tax (2) 2 Discontinued operations, net -- ---------- ---------- ---------- NET INCOME $ 487 $ (11) $ 476 ========== ========== ========== BASIC EARNINGS PER COMMON SHARE Income from continuing operations $ 1.25 $ 1.22 Discontinued operations, net of tax (0.01) -- ---------- ---------- Net Income $ 1.24 $ 1.22 ========== ========== 2

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM Items Affecting Comparability of Core Earnings Between Periods The item(s) are included in core earnings but are shown below because they affect the comparability of core earnings between periods. PRE-TAX First Quarter ------------------------------ INCOME / (EXPENSE) 2005 2004 ------------ ------------ CORPORATE Environmental remediation (9) -- 3

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM Worldwide Effective Tax Rate ---------------------------------------------- QUARTERLY ---------------------------------------------- 2005 2004 2004 REPORTED INCOME QTR 1 QTR 4 QTR 1 ------------ ------------ ------------ Oil & Gas (a) 1,349 1,179 915 Chemicals 214 125 56 Corporate & other (112) (64) (119) ------------ ------------ ------------ Pre-tax income 1,451 1,240 852 Income tax expense Federal and state 349 261 193 Foreign (a) 252 205 170 ------------ ------------ ------------ Total 601 466 363 ------------ ------------ ------------ Income from continuing operations 850 774 489 ============ ============ ============ WORLDWIDE EFFECTIVE TAX RATE 41% 38% 43% 2005 2004 2004 CORE INCOME QTR 1 QTR 4 QTR 1 ------------ ------------ ------------ Oil & Gas (a) 1,349 1,179 915 Chemicals 214 125 56 Corporate & other (102) (185) (108) ------------ ------------ ------------ Pre-tax income 1,461 1,119 863 Income tax expense Federal and state 343 244 217 Foreign (a) 252 205 170 ------------ ------------ ------------ Total 595 449 387 ------------ ------------ ------------ Core income 866 670 476 ============ ============ ============ WORLDWIDE EFFECTIVE TAX RATE 41% 40% 45% (a) Revenues and income tax expense include taxes owed by Occidental but paid by governmental entities on its behalf. Oil and gas pre-tax income includes the following revenue amounts by periods. 2005 2004 2004 QTR 1 QTR 4 QTR 1 ------------ ------------ ------------ 187 143 116 4

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM 2005 First Quarter Net Income (Loss) Reported Income Comparison FIRST FOURTH QUARTER QUARTER 2005 2004 B / (W) ------------ ------------ ------------ Oil & Gas $ 1,349 $ 1,179 $ 170 Chemical 214 125 89 Corporate Interest expense, net (61) (53) (8) Other (51) (11) (40) Taxes (601) (466) (135) ------------ ------------ ------------ Income from continuing operations 850 774 76 Discontinued operations, net (4) (32) 28 ------------ ------------ ------------ Net Income $ 846 $ 742 $ 104 ============ ============ ============ Basic Earnings Per Common Share Income from continuing operations $ 2.12 $ 1.94 $ 0.18 Discontinued operations, net (0.01) (0.08) 0.07 ------------ ------------ ------------ Net Income $ 2.11 $ 1.86 $ 0.25 ============ ============ ============ Worldwide Effective Tax Rate 41% 38% -3% ============ ============ ============ ================================================================================ OCCIDENTAL PETROLEUM 2005 First Quarter Net Income (Loss) Core Earnings Comparison FIRST FOURTH QUARTER QUARTER 2005 2004 B / (W) ------------ ------------ ------------ Oil & Gas $ 1,349 $ 1,179 $ 170 Chemical 214 125 89 Corporate Interest expense, net (51) (53) 2 Other (51) (132) 81 Taxes (595) (449) (146) ------------ ------------ ------------ Net Income $ 866 $ 670 $ 196 ============ ============ ============ Basic Earnings Per Common Share $ 2.16 $ 1.68 $ 0.48 ============ ============ ============ Worldwide Effective Tax Rate 41% 40% -1% ============ ============ ============ 5

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM OIL & GAS CORE EARNINGS VARIANCE ANALYSIS ($ MILLIONS) 2005 1st Quarter $ 1,349 2004 4th Quarter 1,179 ------------ $ 170 ============ Sales Price $ 161 Sales Volume/Mix (6) Exploration Expense 41 All Others (26) ------------ TOTAL VARIANCE $ 170 ============ ================================================================================ OCCIDENTAL PETROLEUM CHEMICAL CORE EARNINGS VARIANCE ANALYSIS ($ MILLIONS) 2005 1st Quarter $ 214 2004 4th Quarter 125 ------------ $ 89 ============ Sales Price $ 79 Sales Volume/Mix (4) Operations/Manufacturing (5) * All Others 19 ------------ TOTAL VARIANCE $ 89 ============ * Higher feedstock costs offset by lower energy costs 6

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM 2005 First Quarter Net Income (Loss) Reported Income Comparison FIRST FIRST QUARTER QUARTER 2005 2004 B / (W) ------------ ------------ ------------ Oil & Gas $ 1,349 $ 915 $ 434 Chemical 214 56 158 Corporate Interest expense, net (61) (68) 7 Other (51) (51) -- Taxes (601) (363) (238) ------------ ------------ ------------ Income from continuing operations 850 489 361 Discontinued operations, net (4) (2) (2) ------------ ------------ ------------ Net Income $ 846 $ 487 $ 359 ============ ============ ============ Basic Earnings Per Common Share Income from continuing operations $ 2.12 $ 1.25 $ 0.87 Discontinued operations, net (0.01) (0.01) -- ------------ ------------ ------------ Net Income $ 2.11 $ 1.24 $ 0.87 ============ ============ ============ Worldwide Effective Tax Rate 41% 43% 2% ============ ============ ============ ================================================================================ OCCIDENTAL PETROLEUM 2005 First Quarter Net Income (Loss) Core Earnings Comparison FIRST FIRST QUARTER QUARTER 2005 2004 B / (W) ------------ ------------ ------------ Oil & Gas $ 1,349 $ 915 $ 434 Chemical 214 56 158 Corporate Interest expense, net (51) (57) 6 Other (51) (51) -- Taxes (595) (387) (208) ------------ ------------ ------------ Net Income $ 866 $ 476 $ 390 ============ ============ ============ Basic Earnings Per Common Share $ 2.16 $ 1.22 $ 0.94 ============ ============ ============ Worldwide Effective Tax Rate 41% 45% 4% ============ ============ ============ 7

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM OIL & GAS CORE EARNINGS VARIANCE ANALYSIS ($ MILLIONS) 2005 1st Quarter $ 1,349 2004 1st Quarter 915 ------------ $ 434 ============ Sales Price $ 529 Sales Volume/Mix (10) Exploration Expense 7 All Others (92) ------------ TOTAL VARIANCE $ 434 ============ ================================================================================ OCCIDENTAL PETROLEUM CHEMICAL CORE EARNINGS VARIANCE ANALYSIS ($ MILLIONS) 2005 1st Quarter $ 214 2004 1st Quarter 56 ------------ $ 158 ============ Sales Price $ 233 Sales Volume/Mix (6) Operations/Manufacturing (65) * All Others (4) ------------ TOTAL VARIANCE $ 158 ============ * Higher energy, feedstock costs and other manufacturing costs 8

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM SUMMARY OF OPERATING STATISTICS ------------------------------- FIRST QUARTER ----------------------------- 2005 2004 ------------ ------------ NET PRODUCTION PER DAY: UNITED STATES CRUDE OIL AND LIQUIDS (MBL) California 77 77 Permian 148 153 Horn Mountain 18 25 Hugoton 4 3 ------------ ------------ TOTAL 247 258 NATURAL GAS (MMCF) California 241 243 Hugoton 129 127 Permian 146 140 Horn Mountain 12 17 ------------ ------------ TOTAL 528 527 LATIN AMERICA CRUDE OIL (MBL) Colombia 32 36 Ecuador 42 43 ------------ ------------ TOTAL 74 79 MIDDLE EAST CRUDE OIL (MBL) Oman 23 14 Qatar 43 42 Yemen 35 39 ------------ ------------ TOTAL 101 95 NATURAL GAS (MMCF) Oman 56 11 OTHER EASTERN HEMISPHERE CRUDE OIL (MBL) Pakistan 5 9 NATURAL GAS (MMCF) Pakistan 78 75 BARRELS OF OIL EQUIVALENT (MBOE) - --------------------------------------------- SUBTOTAL CONSOLIDATED SUBSIDIARIES 537 543 OTHER INTERESTS COLOMBIA - MINORITY INTEREST (4) (4) RUSSIA - OCCIDENTAL NET INTEREST 30 28 YEMEN - OCCIDENTAL NET INTEREST 2 1 ------------ ------------ TOTAL WORLDWIDE PRODUCTION (MBOE) 565 568 ============ ============ 9

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM SUMMARY OF OPERATING STATISTICS ------------------------------- FIRST QUARTER ----------------------------- 2005 2004 ------------ ------------ OIL & GAS: - ---------- PRICES UNITED STATES Crude Oil ($/BBL) 44.24 32.62 Natural gas ($/MCF) 5.94 5.00 LATIN AMERICA Crude Oil ($/BBL) 39.87 28.99 MIDDLE EAST Crude Oil ($/BBL) 42.00 30.08 Natural Gas ($/MCF) 0.96 0.97 OTHER EASTERN HEMISPHERE Crude Oil ($/BBL) 37.97 29.37 Natural Gas ($/MCF) 2.21 2.23 TOTAL WORLDWIDE Crude Oil ($/BBL) 41.71 30.44 Natural Gas ($/MCF) 4.89 4.55 FIRST QUARTER ----------------------------- 2005 2004 ------------ ------------ EXPLORATION EXPENSE Domestic $ 27 $ 38 Latin America 15 1 Middle East 1 13 Other Eastern Hemisphere 4 2 ------------ ------------ TOTAL $ 47 $ 54 ============ ============ 10

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM CHEMICALS Volume (M Tons, except PVC Resins) FIRST QUARTER ----------------------------- MAJOR PRODUCTS 2005 2004 ------------ ------------ Chlorine 705 706 Caustic soda 714 732 Ethylene Dichloride 130 122 PVC Resins (millions of pounds) 1,025 1,071 CHEMICALS Prices (Index) FIRST QUARTER ----------------------------- MAJOR PRODUCTS 2005 2004 ------------ ------------ Chlorine 2.56 1.60 Caustic soda 1.52 0.71 Ethylene Dichloride 1.78 1.32 PVC Resins 1.29 0.94 1987 through 1990 average price = 1.00 CHLORINE - -------- OxyChem Commentary - ------------------ o As contract terms permitted, OxyChem fully implemented the $20 per ton price increase announced November 2004 effective December 2004. o OxyChem announced an additional $20 per ton increase in February to be effective April 1st to most accounts. Other U.S. chlor-alkali producers announced similar increases. o 2nd quarter industry operating rates are expected to decline slightly from the 1st quarter due to scheduled maintenance outages. However, the supply/demand balance is expected to tighten further as the seasonal demand for downstream products improves. o Order control programs for chlorine are still in effect and are expected to remain through the 2nd quarter for OxyChem and other U.S. producers. 11

Investor Relations Supplemental Schedules [OXY LOGO] Influencing Factors: - -------------------- The absence of a normal seasonal decline in 1st quarter chlorine operating rates is indicative of sustained strong chlorine demand. There are growing concerns in the market around 2nd quarter chlorine availability as the seasonal increase in chlorine demand is still ahead coupled with several scheduled production outages. As a result of the projected tightening in supply, OxyChem expects successful implementation of the latest price increase. CAUSTIC - ------- OxyChem Commentary - ------------------ o Caustic soda sales remained strong in the 1st quarter despite a seasonal decline in the demand for bleach. Although sales demand declined marginally in total from the 4th quarter, sales to the two largest market segments, pulp and paper and alumina, increased versus the 4th quarter. Sales volume is expected to increase in the 2nd quarter as seasonal demand improves. o As contract terms permitted, OxyChem successfully implemented in the 1st quarter the $50 DST price increase announced November 2004. An additional increase of $40 DST was announced in February to be implemented in the 2nd quarter. All other major U.S. producers have announced a similar increase. Market conditions are expected to support further price improvement in the 2nd quarter as seasonal demand for caustic soda increases. o OxyChem and other U.S. producers remain on order control programs for liquid caustic soda. Influencing Factors: - -------------------- Continued strength in the U.S. manufacturing sector is expected to keep demand and supply in balance for liquid caustic soda. Seasonal demand for liquid caustic soda is anticipated to narrow the supply/demand balance in the U.S. Gulf Coast and support further price improvement. However, mild temperatures throughout the U.S. could have an impact on demand and future price improvement. EDC - --- OxyChem Commentary - ------------------ o Scheduled and unscheduled 1st quarter VCM outages coupled with increased acetylene based VCM production out of China reduced the global demand for EDC in the 1st quarter. o EDC prices remained in the range of $500 - $520 per metric ton CIF Asia for the quarter. Prices have weakened slightly going into the 2nd quarter. Supply/demand balances will influence the direction of future pricing movements. 12

Influencing Factors: - -------------------- Planned and unplanned 2nd quarter VCM outages coupled with additional Chinese acetylene based VCM production will limit EDC export demand in the 2nd quarter. The limited EDC demand will be offset somewhat by tighter EDC supply as chlorine is directed into its merchant market to satisfy the seasonal surge in chlorine demand. Spot export shipments from the U.S. Gulf are expected to be minimal in the 2nd quarter. PVC/VCM - ------- OxyChem Commentary - ------------------ o OxyChem's 1st quarter PVC operating rate increased 2% over the 4th quarter 2004. o A strong domestic market in the 1st quarter resulted in increased operating rates for PVC and minimal inventory build by producers as they prepared for the seasonal spring surge in demand. o Domestic PVC resin prices increased $0.02 per pound in January, remained flat in February and increased another $0.02 per pound in March. An additional price increase of $0.01 per pound has been announced for April. o Westlake has restarted the Geismar VCM and PVC plants at 50% operating rates. It is expected that the plants will be brought up to capacity by January 2006. The Shintech Addis facility remains idle and is not expected to restart in 2005. o PVC resin export prices ended the quarter at $890 - $920 per metric ton CFR Southeast Asia. Exports for the 1st quarter were off 10% versus the prior year. o 1st quarter VCM demand was limited within the Americas but remained balanced with supply due to the Pemex and Dow outages. High freight rates and reduced demand to Asia made VCM sales from the U.S. Gulf Coast uneconomical. Pemex resumed operation of their Pajaritos plant in late March. o VCM export prices ended the quarter at $810 per metric ton FOB U.S. Gulf Coast to Latin America and $750 per metric ton CFR Southeast Asia. Demand to Asia weakened as Chinese producers brought on additional acetylene based VCM capacity Influencing Factors: - -------------------- Increased seasonal domestic demand will result in some margin improvement for VCM and PVC in the first half of 2005. Margin improvement on the export side for both VCM and PVC will be limited due to high freight rates from the U.S. Gulf Coast to other parts of the world and increased production in Asia. 13

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM SUMMARY OF OPERATING STATISTICS ------------------------------- FIRST QUARTER ----------------------------- CAPITAL EXPENDITURES ($MM) 2005 2004 ------------ ------------ Oil & Gas California $ 82 $ 61 Permian 63 62 Other - U.S. 29 4 Latin America 51 20 Middle East / North Africa 273 168 Other Eastern Hemisphere 8 11 Chemicals 28 16 Corporate 2 1 ------------ ------------ TOTAL $ 536 $ 343 ============ ============ FIRST QUARTER DEPRECIATION, DEPLETION & ----------------------------- AMORTIZATION OF ASSETS ($MM) 2005 2004 ------------ ------------ Oil & Gas Domestic $ 154 $ 156 Latin America 25 22 Middle East 90 69 Other Eastern Hemisphere 10 12 Chemicals 59 60 Corporate 6 5 ------------ ------------ TOTAL $ 344 $ 324 ============ ============ 14

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM CORPORATE ($ millions) 31-MAR-05 31-DEC-04 --------------- --------------- CAPITALIZATION Oxy Long-Term Debt (including current maturities) $ 3,365 $ 3,804 Subsidiary Preferred Stock 75 75 Others 26 26 --------------- --------------- TOTAL DEBT $ 3,466 $ 3,905 =============== =============== EQUITY $ 11,241 $ 10,550 =============== =============== Total Debt To Total Capitalization 24% 27% =============== =============== 15

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM CORPORATION 2004 QUARTERLY FINANCIAL DATA --------------------------------------------------------- RETROSPECTIVE APPLICATION Three Months Ended --------------------------------------------------------- 2004 March 31 June 30 September 30 December 31 Total Year ------------ ------------ ------------ ------------ ------------ Segment net sales Oil and gas 1,693 1,783 2,033 2,073 7,582 Chemical 834 911 945 985 3,675 Other 30 30 27 24 111 ------------ ------------ ------------ ------------ ------------ Net sales 2,557 2,724 3,005 3,082 11,368 ============ ============ ============ ============ ============ Gross profit 1,177 1,286 1,544 1,588 5,595 ============ ============ ============ ============ ============ Segment earnings Oil and gas 915 980 1,216 1,179 4,290 Chemical 56 92 141 125 414 ------------ ------------ ------------ ------------ ------------ 971 1,072 1,357 1,304 4,704 Unallocated corporate items Interest expense Interest expense, net (54) (59) (59) (52) (224) Trust preferred distributions and other (14) (1) -- (1) (16) ------------ ------------ ------------ ------------ ------------ (68) (60) (59) (53) (240) Income taxes (363) (384) (495) (466) (1,708) Other (51) (44) (44) (11) (150) ------------ ------------ ------------ ------------ ------------ Income from continuing operations 489 584 759 774 2,606 Discontinued operations, net (2) (3) (1) (32) (38) ------------ ------------ ------------ ------------ ------------ Net income 487 581 758 742 2,568 ============ ============ ============ ============ ============ Basic earnings per common share Income from continuing operations $ 1.25 $ 1.48 $ 1.91 $ 1.94 $ 6.59 Discontinued operations, net (0.01) -- -- (0.08) (0.10) ------------ ------------ ------------ ------------ ------------ Basic earnings per common share $ 1.24 $ 1.48 $ 1.91 $ 1.86 $ 6.49 ============ ============ ============ ============ ============ Diluted earnings per common share Income from continuing operations $ 1.24 $ 1.46 $ 1.88 $ 1.91 $ 6.50 Discontinued operations, net (0.01) -- -- (0.08) (0.10) ------------ ------------ ------------ ------------ ------------ Diluted earnings per common share $ 1.23 $ 1.46 $ 1.88 $ 1.83 $ 6.40 ============ ============ ============ ============ ============ Dividends per common share $ 0.275 $ 0.275 $ 0.275 $ 0.275 $ 1.10 ============ ============ ============ ============ ============ 16

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM CORPORATION 2004 QUARTERLY CORE FINANCIAL DATA RETROSPECTIVE APPLICATION Three Months Ended --------------------------------------------------------- 2004 March 31 June 30 September 30 December 31 Total Year ------------ ------------ ------------ ------------ ------------ Segment earnings Oil and gas 915 980 1,216 1,179 4,290 Chemical 56 92 141 125 414 ------------ ------------ ------------ ------------ ------------ 971 1,072 1,357 1,304 4,704 Unallocated corporate items Interest expense Interest expense, net (54) (59) (59) (52) (224) Trust preferred distributions and other (3) (1) -- (1) (5) ------------ ------------ ------------ ------------ ------------ (57) (60) (59) (53) (229) Income taxes (387) (384) (495) (449) (1,715) Other (51) (44) (44) (132) (271) ------------ ------------ ------------ ------------ ------------ CORE INCOME 476 584 759 670 2,489 Significant Items Affecting Earnings (see detail below) 11 (3) (1) 72 79 ------------ ------------ ------------ ------------ ------------ Reported income 487 581 758 742 2,568 ============ ============ ============ ============ ============ Basic earnings per common share Core Income $ 1.22 $ 1.49 $ 1.92 $ 1.68 $ 6.29 ============ ============ ============ ============ ============ SIGNIFICANT ITEMS AFFECTING EARNINGS Gain on Lyondell stock issuance (SAB 51) -- -- -- 121 121 Trust preferred redemption charge (11) -- -- -- (11) Settlement of tax issues 20 -- -- 27 47 Tax effect of adjustments 4 -- -- (44) (40) Discontinued operations, net (a) (2) (3) (1) (32) (38) ------------ ------------ ------------ ------------ ------------ 11 (3) (1) 72 79 ============ ============ ============ ============ ============ (a) These amounts are shown after-tax 17

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM CORPORATION 2003 QUARTERLY FINANCIAL DATA RETROSPECTIVE APPLICATION Three Months Ended --------------------------------------------------------- 2003 March 31 June 30 September 30 December 31 Total Year ------------ ------------ ------------ ------------ ------------ Segment net sales Oil and gas 1,553 1,440 1,480 1,530 6,003 Chemical 767 764 771 790 3,092 Other 28 41 46 30 145 ------------ ------------ ------------ ------------ ------------ Net sales 2,348 2,245 2,297 2,350 9,240 ============ ============ ============ ============ ============ Gross profit 1,075 1,005 1,038 1,088 4,206 ============ ============ ============ ============ ============ Segment earnings Oil and gas 875 755 796 787 3,213 Chemical 41 50 65 67 223 ------------ ------------ ------------ ------------ ------------ 916 805 861 854 3,436 Unallocated corporate items Interest expense Interest expense, net (124) (53) (59) (53) (289) Trust preferred distributions and other (11) (11) (12) (10) (44) ------------ ------------ ------------ ------------ ------------ (135) (64) (71) (63) (333) Income taxes (334) (292) (301) (304) (1,231) Other (52) (73) (42) (104) (271) ------------ ------------ ------------ ------------ ------------ Income from continuing operations 395 376 447 383 1,601 Discontinued operations, net (2) (2) (1) (1) (6) Cumulative effect of accounting changes, net (68) -- -- -- (68) ------------ ------------ ------------ ------------ ------------ Net income 325 374 446 382 1,527 ============ ============ ============ ============ ============ Basic earnings per common share Income from continuing operations $ 1.04 $ 0.99 $ 1.16 $ 0.99 $ 4.17 Discontinued operations, net -- (0.01) -- -- (0.01) Cumulative effect of accounting changes, net (0.18) -- -- -- (0.18) ------------ ------------ ------------ ------------ ------------ Basic earnings per common share $ 0.86 $ 0.98 $ 1.16 $ 0.99 $ 3.98 ============ ============ ============ ============ ============ Diluted earnings per common share Income from continuing operations $ 1.03 $ 0.98 $ 1.14 $ 0.97 $ 4.12 Discontinued operations, net -- (0.01) -- -- (0.01) Cumulative effect of accounting changes, net (0.18) -- -- -- (0.18) ------------ ------------ ------------ ------------ ------------ Diluted earnings per common share $ 0.85 $ 0.97 $ 1.14 $ 0.97 $ 3.93 ============ ============ ============ ============ ============ Dividends per common share $ 0.26 $ 0.26 $ 0.26 $ 0.26 $ 1.04 ============ ============ ============ ============ ============ 18

Investor Relations Supplemental Schedules [OXY LOGO] OCCIDENTAL PETROLEUM CORPORATION 2003 QUARTERLY CORE FINANCIAL DATA RETROSPECTIVE APPLICATION Three Months Ended --------------------------------------------------------- 2003 March 31 June 30 September 30 December 31 Total Year ------------ ------------ ------------ ------------ ------------ Segment earnings Oil and gas 875 755 796 787 3,213 Chemical 41 50 65 67 223 ------------ ------------ ------------ ------------ ------------ 916 805 861 854 3,436 Unallocated corporate items Interest expense Interest expense, net (63) (53) (59) (53) (228) Trust preferred distributions and other (11) (11) (12) (10) (44) ------------ ------------ ------------ ------------ ------------ (74) (64) (71) (63) (272) Income taxes (355) (292) (301) (304) (1,252) Other (52) (73) (42) (104) (271) ------------ ------------ ------------ ------------ ------------ CORE INCOME 435 376 447 383 1,641 Significant Items Affecting Earnings (see detail below) (110) (2) (1) (1) (114) ------------ ------------ ------------ ------------ ------------ Reported income 325 374 446 382 1,527 ============ ============ ============ ============ ============ Basic earnings per common share Core Income $ 1.15 $ 0.98 $ 1.16 $ 0.99 $ 4.27 ============ ============ ============ ============ ============ SIGNIFICANT ITEMS AFFECTING EARNINGS Debt repayment fee (61) -- -- -- (61) Tax effect of adjustments 21 -- -- -- 21 Discontinued operations, net (a) (2) (2) (1) (1) (6) Cumulative effect of accounting changes, net (a) (68) -- -- -- (68) ------------ ------------ ------------ ------------ ------------ (110) (2) (1) (1) (114) ============ ============ ============ ============ ============ (a) These amounts shown after-tax 19

Investor Relations Supplemental Schedules [OXY LOGO] Statements in this presentation that contain words such as "will", "expect" or "estimate", or otherwise relate to the future, are forward-looking and involve risks and uncertainties that could significantly affect expected results. Factors that could cause results to differ materially include, but are not limited to: global commodity pricing fluctuations and supply/demand considerations for oil, gas and chemicals; higher-than-expected costs; political risk; and not successfully completing (or any material delay in) any expansion, capital expenditure, acquisition, or disposition. Occidental disclaims any obligation to update any forward-looking statements. The United States Securities and Exchange Commission (SEC) permits oil and natural gas companies, in their filings with the SEC, to disclose only proved reserves demonstrated by actual production or conclusive formation tests to be economically producible under existing economic and operating conditions. We use certain terms in this presentation, such as probable, possible and recoverable reserves, that the SEC's guidelines strictly prohibit us from using in filings with the SEC. U.S. investors are urged to consider carefully the disclosure in our Form 10-K, available through the following toll-free telephone number, 1-888-OXYPETE (1-888-699-7383) or on the Internet at http://www.oxy.com. You also can obtain a copy from the SEC by calling 1-800-SEC-0330. 20