EXHIBIT 99.1

                                  NEWS RELEASE

                                                   Investor Relations Contacts:
                               Susan Spratlen or Chris Paulsen   (972) 444-9001


            Pioneer Initiating Sidetrack Operations on Harrier Field,
                                Updating Guidance


Dallas,   Texas,   September  7,  2004  --  Pioneer  Natural  Resources  Company
("Pioneer")  (NYSE:PXD)  announced today that it has shut in production from the
Harrier field in the Falcon Corridor of the deepwater Gulf of Mexico as a result
of  early  water  encroachment.   A  sidetrack  well  is  expected  to  spud  in
mid-September  to  access  an  adjacent  fault  block in the  field and could be
producing by the end of October. Proved reserves for the Falcon Corridor are not
expected to change  significantly  as any impact to Harrier  reserves  should be
offset by reserve additions related to better than expected  production data for
the Falcon field.

Pioneer plans to initiate a drilling  campaign in the Falcon Corridor during the
first half of 2005 that is expected to include  two to three  exploration  wells
and another sidetrack targeting additional reserves.

Pioneer  expects  total  company  production  for the third  quarter  to average
180,000 to 185,000  barrels oil  equivalent  per day,  reflecting  the impact of
downtime for the above mentioned Harrier operations and weather-related downtime
on  the  Canyon  Express  and  Devils  Tower  systems  stemming  from  personnel
evacuations  for hurricanes  Charlie and Earl. The new third quarter  production
range  does not  include  allowances  for any  additional  downtime  related  to
weather.

In  Argentina,  the  government  continues  to take steps to limit  increases in
domestic gasoline prices in the face of rising oil prices,  including  increases
in oil export taxes.  In early August,  the oil export tax was increased  from a
flat 25% to a range  of 25% to 45%  (effective  rates  of 20% to 31%),  with the
highest rate effective for export sales  occurring when West Texas  Intermediate
prices reach $45 or more per barrel. While Pioneer does not currently export any
of its oil  production,  the Company is  currently  negotiating  domestic  sales
prices which are expected to be  retroactive  to August 6 and move toward parity
with export price  realizations.  Argentine  liquids sales  currently  represent
approximately 15% of Pioneer's worldwide liquids production.

Pioneer is a large  independent oil and gas  exploration and production  company
with  operations in the United States,  Argentina,  Canada,  Equatorial  Guinea,
Gabon, South Africa and Tunisia.  Pioneer's headquarters are in Dallas. For more
information, visit Pioneer's website at www.pioneernrc.com .

Pioneer has filed with the SEC a  registration  statement  containing  the joint
proxy  statement-prospectus  to be used by Pioneer to  solicit  approval  of its
stockholders to issue additional stock in the merger and to be used by Evergreen
to solicit the approval of its stockholders for the proposed merger. Pioneer has
also filed other documents concerning the proposed merger. You are urged to read
the registration  statement and the joint proxy  statement-prospectus  regarding
the proposed merger because they contain important information. You can obtain a
free copy of the joint proxy  statement-prospectus  including  the  registration
statement,  as well as other filings containing information about Pioneer at the
SEC's   Internet   Site   (http://www.sec.gov).   Copies  of  the  joint   proxy
statement-prospectus can also be obtained without charge, by directing a request
to: Pioneer Natural Resources Company,  Susan Spratlen,  5205 N. O'Connor Blvd.,
Suite 900, Irving, Texas 75039, or via telephone at 972-969-3583.

Pioneer  and  its  directors  and  executive   officers  may  be  deemed  to  be
participants in the  solicitation of proxies from the stockholders of Pioneer in
connection with the proposed  merger.  Evergreen and its directors and executive
officers may be deemed to be  participants  in the  solicitation of proxies from
the stockholders of Evergreen in connection with the proposed merger. Additional
information  regarding  the interests of those  participants  may be obtained by
reading the joint proxy statement-prospectus regarding the proposed merger.





This filing  contains  forward-looking  statements that are made pursuant to the
Safe Harbor Provisions of the Private Securities  Litigation Reform Act of 1995,
particularly  those statements  regarding the effects of the proposed merger and
those preceded by, followed by or that otherwise  include the words  "believes,"
"expects,"   "anticipates,"  "intends,"  "estimates,"  or  similar  expressions.
Forward-looking  statements  relating to  expectations  about future  results or
events are based upon  information  available  to Pioneer  and  Evergreen  as of
today's date,  and neither  Pioneer nor  Evergreen  assumes any  obligations  to
update  any  of  these  statements.   The  forward-looking  statements  are  not
guarantees  of the future  performance  of Pioneer,  Evergreen  or the  combined
company,   and  actual  results  may  vary   materially  from  the  results  and
expectations discussed. For instance, although Pioneer and Evergreen have signed
an agreement  for a subsidiary of Pioneer to merge with  Evergreen,  there is no
assurance that they will complete the proposed merger. The merger agreement will
terminate if the companies do not receive necessary approval of the stockholders
of Pioneer and Evergreen or government  approvals or fail to satisfy  conditions
to closing.  Additional risks and  uncertainties  related to the proposed merger
include, but are not limited to, conditions in the financial markets relevant to
the proposed  merger,  the  successful  integration  of Evergreen into Pioneer's
business,  and each company's  ability to compete in the highly  competitive oil
and gas exploration and production industry. The revenues, earnings and business
prospects  of Pioneer  and the  combined  company  and their  ability to achieve
planned  business   objectives  will  be  subject  to  a  number  of  risks  and
uncertainties.  These  risks and  uncertainties  include,  among  other  things,
volatility  of oil and gas  prices,  product  supply  and  demand,  competition,
government  regulation or action,  foreign currency valuation  changes,  foreign
government  tax and  regulation  changes,  litigation,  the costs and results of
drilling and operations,  Pioneer's ability to replace  reserves,  implement its
business plans, or complete its development projects as scheduled, access to and
cost of capital, uncertainties about estimates of reserves, quality of technical
data, environmental and weather risks, acts of war or terrorism. These and other
risks are  identified  from time to time in  Pioneer's  SEC  reports  and public
announcements.