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 28, 2004 ------------------------ UNOCAL CORPORATION -------------------------------------------------------------------------------- (Exact name of registrant as specified in its charter) Delaware -------------------------------------------------------------------------------- (State or Other Jurisdiction of Incorporation) 1-8483 95-3825062 -------------------------------------------------------------------------------- (Commission File Number) (I.R.S. Employer Identification No.) 2141 Rosecrans Avenue, Suite 4000, El Segundo, California 90245 -------------------------------------------------------------------------------- (Address of Principal Executive Offices) (Zip Code) (310) 726-7600 -------------------------------------------------------------------------------- (Registrant's Telephone Number, Including Area Code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: |_| Written communications pursuant to Rule 425 under the Securities Act |_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act |_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act |_| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act Item 8.01. Other Events. On September 28, 2004, Unocal Corporation ("Unocal") announced by press release that it had elected not to proceed with its participation in five contracts to explore for, develop, and market natural gas resources in the Xihu Trough off the coast of Shanghai, in the East China Sea. The full text of the press release is filed as an exhibit under Item 9.01(c) of this report. Item 9.01. Financial Statements and Exhibits. (c) Press release, dated September 28, 2004, entitled "Unocal elects not to proceed with East China Sea E&P projects". 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, thereunto duly authorized. UNOCAL CORPORATION (Registrant) Date: September 28, 2004 By: /s/ JOE D. CECIL ------------------------ ------------------------ Joe D. Cecil Vice President and Comptroller