SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 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)        October 30, 2002
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                               UNOCAL CORPORATION
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             (Exact name of registrant as specified in its charter)



                                    Delaware
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                 (State or Other Jurisdiction of Incorporation)



    1-8483                                   95-3825062
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(Commission File Number)                (I.R.S. Employer Identification No.)



2141 Rosecrans Avenue, Suite 4000, El Segundo, California         90245
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(Address of Principal Executive Offices)                       (Zip Code)



                                 (310) 726-7600
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              (Registrant's Telephone Number, Including Area Code)



Item 5.      Other Events.


On October 30, 2002, Unocal Corporation announced that it had completed the
acquisition of Pure Resources, Inc. The full text of the press release is filed
as an exhibit under Item 7(c) of this report.

Item 7.  Financial Statements and Exhibits.

(c)      Exhibits

99.1     Press Release of Unocal announcing the completion of the acquisition of
         Pure Resources, dated October 30, 2002.


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, thereunto duly authorized.




                                           UNOCAL CORPORATION
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                                           (Registrant)




Date:  October 31, 2002                  By:  /s/ JOE D. CECIL
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                                           Joe D. Cecil
                                           Vice President and Comptroller

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