EXHIBIT 99.1

                                        Unocal Corporation
                                        2141 Rosecrans Avenue, Suite 4000
                                        El Segundo, California 90245

                                  [UNOCAL LOGO]

                                        NEWS RELEASE

                                        Contact:     Barry Lane (Media)
                                                     310-726-7731
                                                     Robert Wright (Investors)
                                                     310-726-7665

                 Unocal completes acquisition of Pure Resources

       El Segundo,  Calif., Oct. 30, 2002 -- Unocal Corporation (NYSE: UCL) and
its Union Oil Company of California  subsidiary,  today said that they had
completed a short-form  merger of a wholly owned Union Oil  subsidiary  into
Pure  Resources,  Inc.,  following the close of trading on the New York Stock
Exchange yesterday.  As a result, Pure is now a wholly owned subsidiary of
Union Oil.
       In the merger, each Pure share other than those owned by Union Oil was
converted into the right to receive 0.74 shares of Unocal common stock, subject
to the rights of Pure's remaining stockholders to seek appraisal under Delaware
law. The short-form merger allowed Union Oil to acquire the remaining Pure
shares that were not tendered under its exchange offer.
       Union Oil had earlier accepted for exchange 16.6 million Pure shares that
were tendered and not withdrawn as of the expiration of the exchange offer at
midnight, New York City time, Oct. 29.
       The exchange offer resulted in Union Oil owning a total of 49.3 million
shares, representing more than 97 percent of the outstanding Pure shares. Each
share of Pure common stock tendered under the exchange offer was exchanged for
0.74 shares of Unocal common stock. Unocal expects to issue approximately 13.2
million shares of Unocal common stock to Pure stockholders.
       Unocal named Don Hansen as interim business leader of Pure. Hansen will
continue as president of Northrock Resources, Ltd., a wholly owned Canada-based
subsidiary of Union Oil, during the interim period. The company expects to name
a permanent business unit leader for Pure soon.
       Unocal said that Pure Resources' senior management team, including Jack
Hightower, Pure chairman, president and chief executive officer, will continue
to provide services to Pure during a transition period.

About Unocal Corporation
       Unocal is one of the world's largest independent natural gas and crude
oil exploration and production companies. Based in El Segundo, Calif., Unocal's
principal production operations are in North America and Asia. More information
about the company is available at www.unocal.com.
                                    * * * * *
This news release contains certain forward-looking statements about expected
business transactions and personnel changes. These statements are not guarantees
of future performance. The statements are based upon Unocal's current
expectations and beliefs and are subject to a number of known and unknown risks
and uncertainties that could cause actual results to differ materially from
those described in the forward looking statements. Actual results could differ
materially as a result of factors discussed in Unocal's amended 2001 Annual
Report on Form 10-K/A and subsequent reports filed with the U.S. Securities and
Exchange Commission. Unocal undertakes no obligation to update the information
in this news release.

Investors are urged to consider closely the disclosure in Unocal's amended 2001
Annual Report on Form 10-K/A and other reports filed with the SEC (SEC File No.
1-8483). Copies of the Company's SEC filings are available from the Company by
calling 800-252-2233 or from the SEC by calling 800-SEC-0330. The reports are
also available on the Unocal web site, www.unocal.com.
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