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

                                    Form 13F

                               Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:   March 31, 2010

Check here if Amendment [ ]; Amendment Number:
     This Amendment (Check only one.):           [ ]  is a restatement.
                                                 [ ]  adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:          Occidental Petroleum Corporation
Address:       10889 Wilshire Boulevard
               Los Angeles, California 90024

Form 13F File Number:  28-10313


The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:     Roy Pineci
          Vice President, Controller and Principal Accounting Officer
          Occidental Petroleum Corporation
Phone:    (310) 208-8800

Signature, Place, and Date of Signing:

     /s/ ROY PINECI                 Los Angeles, California       May 12, 2010
     ---------------------------    -----------------------    -----------------
             [Signature]                 [City, State]               [Date]

Report Type (Check only one.):

[X]    13F HOLDINGS REPORT. (Check here if all holdings of this reporting
       manager are reported in this report.)

[ ]    13F NOTICE. (Check here if no holdings reported are in this report, and
       all holdings are reported by other reporting manager(s).)

[ ]    13F COMBINATION REPORT. (Check here if a portion of the holdings for this
       reporting manager are reported in this report and a portion are reported
       by other reporting manager(s).)

Form 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 4 Form 13F Information Table Entry Total: 31 Form 13F Information Table Value Total: $97,815 (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. No. 13F File Number Name 1 28-12381 Phibro LLC 2 28- Phibro Trading LLC 3 28- Oxy Energy Services Inc. 4 28- Occidental Petroleum Investment Co.

FORM 13F INFORMATION TABLE COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 - ---------------------------- -------------- --------- -------- ---------------- -------------- -------- -------------------- VOTING AUTHORITY VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER -------------------- NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE - ---------------------------- -------------- --------- -------- ------- --- ---- -------------- -------- ------ ------ ------ CME GROUP INC COM 12572Q105 2529 8000 SH SHARED-DEFINED 1,2,3,4 8000 INTERCONTINENTALEXCHANGE INC COM 45865V100 355 3162 SH SHARED-DEFINED 1,2,3,4 3162 ARCH COAL INC COM 039380100 1715 75036 SH SHARED-DEFINED 1,2,3,4 75036 APACHE CORP COM 037411105 609 6000 SH SHARED-DEFINED 1,2,3,4 6000 ANADARKO PETE CORP COM 032511107 5631 77315 SH SHARED-DEFINED 1,2,3,4 77315 BHP BILLITON LTD SPONSORED ADR 088606108 3489 43440 SH SHARED-DEFINED 1,2,3,4 43440 BP PLC SPONSORED ADR 055622104 1760 30837 SH SHARED-DEFINED 1,2,3,4 30837 VALE SA ADR 91912E105 3732 115940 SH SHARED-DEFINED 1,2,3,4 115940 CHENIERE ENERGY INC COM NEW 16411R208 618 200000 SH SHARED-DEFINED 1,2,3,4 200000 CHESAPEAKE ENERGY CORP COM 165167107 2672 113037 SH SHARED-DEFINED 1,2,3,4 113037 ENI S P A SPONSORED ADR 26874R108 1753 37350 SH SHARED-DEFINED 1,2,3,4 37350 EXXON MOBIL CORP COM 30231G102 6111 91236 SH SHARED-DEFINED 1,2,3,4 91236 FREEPORT-MCMORAN COPPER & GO COM 35671D857 4706 56335 SH SHARED-DEFINED 1,2,3,4 56335 GERDAU S A SPONSORED ADR 373737105 3159 193819 SH SHARED-DEFINED 1,2,3,4 193819 HALLIBURTON CO COM 406216101 3539 117465 SH SHARED-DEFINED 1,2,3,4 117465 HESS CORP COM 42809H107 2246 35902 SH SHARED-DEFINED 1,2,3,4 35902 MOSAIC CO COM 61945A107 3541 58264 SH SHARED-DEFINED 1,2,3,4 58264 NABORS INDUSTRIES LTD SHS G6359F103 1763 89828 SH SHARED-DEFINED 1,2,3,4 89828 NOBLE ENERGY INC COM 655044105 3794 51968 SH SHARED-DEFINED 1,2,3,4 51968 PATTERSON UTI ENERGY INC COM 703481101 2882 206302 SH SHARED-DEFINED 1,2,3,4 206302 PEABODY ENERGY CORP COM 704549104 2618 57296 SH SHARED-DEFINED 1,2,3,4 57296 PETROLEO BRASILEIRO SA PETRO SPONSORED ADR 71654V408 3329 74820 SH SHARED-DEFINED 1,2,3,4 74820 RIO TINTO PLC SPONSORED ADR 767204100 4709 19893 SH SHARED-DEFINED 1,2,3,4 19893 ROYAL DUTCH SHELL PLC SPONS ADR A 780259206 1611 27848 SH SHARED-DEFINED 1,2,3,4 27848 SCHLUMBERGER LTD COM 806857108 7061 111263 SH SHARED-DEFINED 1,2,3,4 111263 SOUTHWESTERN ENERGY CO COM 845467109 2568 63072 SH SHARED-DEFINED 1,2,3,4 63072 STATOIL ASA SPONSORED ADR 85771P102 3634 155770 SH SHARED-DEFINED 1,2,3,4 155770 SUNCOR ENERGY INC NEW COM 867224107 5700 175167 SH SHARED-DEFINED 1,2,3,4 175167 TENARIS S A SPONSORED ADR 88031M109 859 20000 SH SHARED-DEFINED 1,2,3,4 20000 TOTAL S A SPONSORED ADR 89151E109 5061 87236 SH SHARED-DEFINED 1,2,3,4 87236 TRANSOCEAN LTD REG SHS H8817H100 4060 46998 SH SHARED-DEFINED 1,2,3,4 46998