Exhibit 99.1




                                 Unocal Rapak, Ltd.
                                 Sentral Senayan 1 Office Tower - 11th Floor
                                 JL. Asia Afrika No. 8, Jakarta 10270, Indonesia

                                 [UNOCAL LOGO]

                                             NEWS RELEASE

                                             Contact:     Barry Lane (Media)
                                                          310-726-7731
                                                          Ron Morin (Investors)
                                                          281-287-7615


   Unocal reports sheen near Ranggas 6 location in Makassar Strait, Indonesia

     El Segundo,  Calif.,  Sept. 25, 2002 - Unocal Corporation (NYSE: UCL) today
said 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.

     A survey by a remotely  operated  vehicle (ROV) shows  hydrocarbon  seepage
from the  plugged  casing  of the  Ranggas  6 well,  approximately  46 miles (75
kilometers) offshore in the Makassar Strait.

     The sheen was first observed Sept. 5 and has varied in size from day to day
depending on weather and wind conditions.

     Unocal has reported the incident to the  Indonesia  Directorate  General of
Oil and Gas  (MIGAS)  and  State  Implementing  Body  for  Upstream  Oil and Gas
Activities  (BPMIGAS).  Unocal has also  activated its  Emergency  Response Team
consisting of highly skilled individuals and managers to monitor and resolve the
situation.

     There have been no reports of  hydrocarbons  impacting the  shoreline.  The
sheen is not expected to have any impact on human health.  All potential impacts
are being assessed and monitored closely.

     Unocal  takes its  responsibilities  to the  environment  and the people of
Indonesia  very  seriously and is making every effort to ensure that the impacts
are  minimized.  The company is working  together  with the relevant  regulatory
bodies and other  entities to come up with the best strategy for  containing the
hydrocarbons and managing any potential impacts.

Background

     Unocal Rapak,  Ltd.,  completed drilling of the Ranggas 6 appraisal well in
August.  The  successful  well was plugged and  abandoned  and the drillship was
moved off the  location.  A ship that was  removing the anchors that had been in
place for the  drillship  first  observed  the sheen.  Water depth is 5,500 feet
(1,700 meters).
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