As filed with the Securities and Exchange Commission on June 28, 2002

                                                      Registration No. 333-79613

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


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                              --------------------

                                 POST-EFFECTIVE
                               AMENDMENT NO. 1 TO
                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                              --------------------

                        OCCIDENTAL PETROLEUM CORPORATION
               (EXACT NAME OF ISSUER AS SPECIFIED IN ITS CHARTER)


                   DELAWARE                                95-4035997
       (State or other jurisdiction of                  (I.R.S. Employer
        incorporation or organization)                Identification No.)

             10889 WILSHIRE BOULEVARD
             LOS ANGELES, CALIFORNIA                                90024
     (Address of Principal Executive Offices)                    (Zip code)


                           OXY VINYLS, LP SAVINGS PLAN
                            (Full title of the plan)


                            DONALD P. DE BRIER, ESQ.
                                 GENERAL COUNSEL
                        OCCIDENTAL PETROLEUM CORPORATION
                            10889 WILSHIRE BOULEVARD
                          LOS ANGELES, CALIFORNIA 90024
                                 (310) 443-6176
 (Name, address and telephone number, including area code, of agent for service)


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

PART II INFORMATION NOT REQUIRED IN PROSPECTUS DEREGISTRATION OF SECURITIES On May 28, 1999, Occidental Petroleum Corporation (the "Company") filed with the Securities and Exchange Commission a Registration Statement on Form S-8 (Registration Statement No. 333-79613) (the "Form S-8") registering 1,000,000 shares of the Registrant's Common Stock, $0.20 par value (the "Shares"), to be issued to participants under the Registrant's Oxy Vinyls, LP Savings Plan (the "Plan"). The Plan was merged into the Occidental Petroleum Corporation Savings Plan after an aggregate of 601,804 Shares were issued to participants thereunder. This Post-Effective Amendment No. 1 to the Registration Statement on Form S-8 is being filed in order to deregister all Shares that were registered under the Form S-8 and remain unissued under the Plan. 1

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Post-Effective Amendment No. 3 to Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Los Angeles, State of California, on June 28, 2002. OCCIDENTAL PETROLEUM CORPORATION (REGISTRANT) By: RAY R. IRANI* ------------------------------------ Ray R. Irani Chairman of the Board of Directors and Chief Executive Officer Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 3 to Registration Statement has been signed by the following persons in the capacities and on the dates indicated. SIGNATURE TITLE DATE --------- ----- ---- RAY R. IRANI* Chairman of the Board of June 28, 2002 - ------------------------- Directors and Chief Ray R. Irani Executive Officer STEPHEN I. CHAZEN* Executive Vice President - June 28, 2002 - ------------------------- Corporate Development Stephen I. Chazen and Chief Financial Officer SAMUEL P. DOMINICK, JR.* Vice President and June 28, 2002 - ------------------------- Controller (Chief Samuel P. Dominick, Jr. Accounting Officer) RONALD W. BURKLE* Director June 28, 2002 - ------------------------- Ronald W. Burkle JOHN S. CHALSTY* Director June 28, 2002 - ------------------------- John S. Chalsty 2

SIGNATURE TITLE DATE --------- ----- ---- EDWARD P. DJEREJIAN* Director June 28, 2002 - ------------------------- Edward P. Djerejian JOHN E. FEICK* Director June 28, 2002 - ------------------------- John E. Feick DALE R. LAURANCE* Director June 28, 2002 - ------------------------- Dale R. Laurance IRVIN W. MALONEY* Director June 28, 2002 - ------------------------- Irvin W. Maloney RODOLFO SEGOVIA* Director June 28, 2002 - ------------------------- Rodolfo Segovia AZIZ D. SYRIANI* Director June 28, 2002 - ------------------------- Aziz D. Syriani ROSEMARY TOMICH* Director June 28, 2002 - ------------------------- Rosemary Tomich *By: /s/ DONALD P. DE BRIER June 28, 2002 -------------------------- Donald P. de Brier, Attorney-in-Fact 3