EXHIBIT 99.1

                                  NEWS RELEASE

                                                               Company Contacts:
                                       Investors: Frank Hopkins or Chris Paulsen
                                      Media and Public Affairs:   Susan Spratlen
                                                                  (972) 444-9001

                       Pioneer Updates Alaska North Slope
                             Exploration Activities

Dallas,  Texas,  March 21, 2005 -- Pioneer Natural Resources Company  (NYSE:PXD)
announced today the execution by its Alaskan subsidiary of a multi-year contract
with Doyon  Drilling,  Inc. to build and operate a new drilling rig designed for
exploration  drilling on the North Slope of Alaska.  Akita  Drilling,  Ltd. will
join Doyon in the construction of the rig.

The Company also  announced the  assignment  of its 40% working  interest in the
Tuvaaq exploration well on Alaska's North Slope to Kerr-McGee.

New Drilling Rig

The new  drilling  rig,  which  will be built in Canada  this  summer  and begin
operations  later  this  year,  will be  lightweight  and  highly  mobile and is
designed to maximize the number of wells  drilled  during the  relatively  short
winter drilling season on the Alaska North Slope. This  fit-for-purpose rig will
significantly  reduce  drilling costs and increase  productivity by reducing ice
road and  mobilization  costs.  It will also allow the Company to  optimize  its
drilling program over Pioneer's  extensive  undeveloped  acreage position on the
North Slope.

Ken Sheffield,  President of Pioneer's Alaska subsidiary commented, "We are very
pleased to be working with two of the most  experienced  and efficient  drilling
contractors  in the  Arctic,  Doyon and Akita.  The new rig is an example of the
entrepreneurial  approach  Pioneer  brings  to the North  Slope and  underscores
Pioneer's  strategy of providing  strong returns and  production  growth through
high-impact exploration in Alaska."

2005 Alaska Exploration Program

Earlier this year, Pioneer announced a $50 million  exploration program for 2005
in Alaska with activities centered on the following areas:

         o     National Petroleum Reserve - Alaska (20% to 30% working interest)
                  1.4 million acres in an under-explored area with various leads
                  and prospects
         o     Storms Lead Area (50% working interest and operator)
                  130,000-acre position  adjacent to  the giant  Prudhoe Bay and
                  Kuparuk River Units
         o     Tuvaaq Offshore Lease (40% working interest)
                  A 14,000-acre block northeast of Pioneer's  Oooguruk Unit with
                  a primary  objective  in the  Ivishak  sands  and a  secondary
                  objective  in the  Schrader  Bluff  sands  encountered  in the
                  adjacent Nikaitchuq Unit

Drilling  operations  have  concluded on the Tuvaaq  exploration  well. The well
encountered wet sands in the primary Ivishak  objective and  hydrocarbon-bearing
sands in the Schrader Bluff interval.  Pioneer elected to assign its interest to
Kerr-McGee rather than participate with a small working interest in the eventual
development  of the  Schrader  Bluff  resource,  most of  which  is found in the
adjacent Nikaitchuq Unit operated by Kerr-McGee.  As a result,  Pioneer will not
incur any capital expense related to the well.







Pioneer and partner ConocoPhillips  concluded a 3-D seismic survey in the Storms
area and may drill the first  exploratory  well on the acreage as early as 2006.
The Company is also  participating  with  ConocoPhillips  and Anadarko Petroleum
Corporation in two to three wells in the National Petroleum Reserve - Alaska.

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

Except for historical  information contained herein, the statements in this News
Release are forward-looking statements that are made pursuant to the Safe Harbor
Provisions of the Private  Securities  Litigation  Reform Act of 1995.  Forward-
looking statements and the business prospects of Pioneer are subject to a number
of risks and  uncertainties  that may cause  Pioneer's  actual results in future
periods to differ materially from the  forward-looking  statements.  These risks
and uncertainties include, among other things, volatility of oil and gas prices,
product  supply  and  demand,  competition,  government  regulation  or  action,
international  operations  and associated  international  political and economic
instability,  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  described  in Pioneer's  10-K and 10-Q  Reports and other  filings with the
Securities and Exchange Commission.