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)        September 25, 2002
                                                        ------------------------



                               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 September 25, 2002,  Unocal  Corporation (the "Company")  issued a press
release  reporting that its Unocal  Indonesia  Company  subsidiary has mobilized
resources to address a thin hydrocarbon sheen near a deepwater well site off the
coast of East  Kalimantan  in  Indonesia.  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    Unocal press  release  reporting  sheen near Ranggas 6 location in
Makassar Strait, Indonesia.


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
                                           ------------------
                                           (Registrant)




Date:  September 25, 2002                  By:  /s/ JOE D. CECIL
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                                           Joe D. Cecil
                                           Vice President and Comptroller

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