EXHIBIT 99.1


                                  NEWS RELEASE

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

                   Pioneer Reports Second Quarter 2006 Results

Dallas,  Texas,  August 3, 2006 -- Pioneer Natural Resources Company  (NYSE:PXD)
today announced  financial and operating  results for the quarter ended June 30,
2006.

o    Pioneer reported net income of $88 million, or $.69 per diluted share.
o    Second quarter oil and gas sales from  continuing  operations  exceeded the
     Company's  guidance,  averaging  98,893  barrels  oil  equivalent  per  day
     (BOEPD).
o    North  American  production  for  the  first  half of 2006  rose  16%  from
     equivalent  volumetric  production  payment (VPP)  adjusted 2005 first half
     levels,   reflecting  the  continuing  success  of  Pioneer's   accelerated
     development  drilling program.  Worldwide production was up 9% for the same
     period.
o    Production  growth is on track to meet or exceed the high end of  Pioneer's
     targeted 2006 worldwide exit rate of 95,000 to 100,000 BOEPD.
o    Pioneer drilled three additional  Edwards Trend  discoveries,  resulting in
     100% success on the five prospects drilled to date.
o    The Company  purchased 4.3 million  shares at $39.27 per share,  completing
     $170  million  of the  remaining  $359  million  share  repurchase  program
     authorized by the Board of Directors.
o    Pioneer  closed  the  $675  million  sale  of  its  Argentine   operations,
     recognizing  an  after-tax  gain on the  disposition  of these assets of $6
     million, or $.05 per diluted share.

Net income  for the second  quarter  of 2006 was  comprised  of (i) income  from
continuing  operations of $66 million, or $.52 per diluted share, as compared to
$22  million,  or $.16 per diluted  share,  for the prior year  quarter and (ii)
income from discontinued  operations of $22 million,  or $.17 per diluted share,
as compared to $163  million,  or $1.12 per  diluted  share,  for the prior year
quarter.

Income from continuing  operations for the second quarter included the following
unusual after-tax items:

o    deferred tax expense  related to the newly  enacted Texas margin tax of $13
     million, or $.10 per diluted share,
o    deferred  tax benefit  from the recent  reduction  in Canadian  federal and
     provincial tax rates of $10 million, or $.07 per diluted share, and
o    a loss of $5 million, or $.04 per diluted share,  associated with the early
     extinguishment of $346 million of 6 1/2% 2008 senior notes with a scheduled
     maturity of January 2008.

Income from discontinued  operations for the second quarter was comprised of the
following after-tax items:

o    a gain on the  disposition of the Argentina  assets of $6 million,  or $.05
     per diluted share, and operating income from the divested  properties prior
     to closing of $4 million, or $.03 per diluted share, and






o    a gain related to deepwater Gulf of Mexico business interruption  insurance
     recoveries (Hurricane Katrina) of $12 million, or $.09 per diluted share.

Cash flow from  operating  activities  for the  second  quarter of 2006 was $158
million.

Scott D.  Sheffield,  Pioneer's  Chairman and CEO,  stated,  "Since shifting our
strategy to deliver strong,  consistent  production growth in North America,  we
have  accelerated  development  drilling,  progressed  several new resource play
opportunities  and advanced our major development  projects.  We are on track to
meet or exceed our production  targets for 2006 and remain confident that we can
deliver  double-digit  production  growth and add significant  shareholder value
over the next five years."

Operations Review

Pioneer currently has 32 rigs running, up from 27 rigs during the first quarter,
and expects to continue to increase  its  drilling  activity  level  through the
remainder of 2006 and have approximately 44 rigs active by year end.

In the Permian Basin,  Pioneer is on track to drill approximately 340 wells this
year, up from 190 wells in 2005.  Production  growth from the Spraberry field is
on target to meet or exceed the Company's  exit rate  forecast  with  production
during the first half of 2006  rising  26% from the same  period in 2005,  after
adjusting for the Company's VPPs for comparison purposes. These strong Spraberry
results are being driven by the success of Pioneer's  deeper drilling  campaign,
which  increases  reserves  and  production  by  including  the deeper  Wolfcamp
formation, and new opportunities from bolt-on acquisitions.

In South Texas, Pioneer is running four rigs in the Edwards Trend and expects to
add two rigs  before  year  end.  The  Company  has  successfully  drilled  five
prospects in different  areas of the Trend with a 100%  success  rate.  Three of
these  prospects  were  drilled in the second  quarter - Bonita,  Barracuda  and
Wahoo. On the previously  announced Sinor prospect,  where four successful wells
have been  drilled,  the Company  expects an aggressive  development  program to
begin in the second  quarter of 2007 after a 3-D  seismic  program is  completed
later this year. On the previously  announced  Stingray  prospect,  the first of
three appraisal wells is being drilled.  Three wells from the Sinor and Stingray
prospects  are now on production  at  approximately  five million cubic feet per
day.  As more  wells  come on  stream  from the five  successful  prospects  and
development  drilling  in the  existing  Pawnee  field  continues,  South  Texas
production  is expected to exceed prior  estimates  for 2006.  In addition,  the
Company continues to believe the Edwards Trend holds a gross resource  potential
of one to three trillion cubic feet and will generate very attractive returns.

In the Rocky  Mountains,  year-to-date  coal bed methane (CBM) production in the
Raton field was up 8% from the same period in 2005.  Through  July,  Pioneer has
drilled 155 of the 330 Raton wells planned for 2006 and recently added the third
rig  planned for this  drilling  program.  The  Company  now  expects  full-year
production  from the Raton  field to exceed  the 5% to 7% annual  growth  target
versus 2005 announced earlier this year.

In northeast Utah and northwest Colorado, Pioneer's programs to evaluate the CBM
resource potential in the Uinta,  Piceance and Sand Wash basins are progressing,
and results  from the initial  pilot wells are  expected to be evaluated in late
2006 / early 2007 to  determine  future  development  plans.  In the Uinta Basin
pilot  program,  25 Castlegate  wells are expected to be producing by the end of
the third quarter,  including four wells to be drilled during the third quarter.
In the Piceance Basin, 35 Columbine  Springs pilot program wells are expected to






be on production during the third quarter.  In the Sand Wash Basin, 22 Lay Creek
wells from the initial  two pilots are  expected  to be  producing  by year end.
Drilling and testing continues on three additional pilots. Pioneer also plans to
drill four wells and shoot  additional  3-D seismic to evaluate  the Main Canyon
Entrada conventional gas play in the Uinta Basin during the second half of 2006.

In Canada,  the  Company has  drilled 20 of the 200  Horseshoe  Canyon CBM wells
planned for 2006,  hindered by road bans from heavy spring rains which prevented
access. The road bans were recently lifted, and Pioneer has two rigs on location
and expects to add a third rig later in the third quarter. To test the potential
of Mannville CBM in the Bashaw area,  Pioneer has drilled four horizontal  wells
and plans to drill two additional horizontal wells during the third quarter.

On the North Slope of Alaska,  Pioneer has  completed  the  construction  of the
gravel drill site for the Oooguruk development  project.  Additional work on the
project  scheduled  for 2006  includes  contouring  and armoring the drill site,
fabricating  equipment and modifying  the drilling rig for  installation  during
2007. The project is on schedule to achieve first oil production in 2008. In the
Cook Inlet,  Pioneer has assumed  operatorship of the Cosmopolitan oil discovery
project and increased its working interest to 50%.

Offshore  South Africa,  development  drilling  continues on the South Coast Gas
Project,  a seven-well  subsea  tie-back to the existing  F-A  platform.  Subsea
infrastructure  is expected to be in place for project startup during the second
half of 2007.

In  Tunisia,  production  from the  Adam 4 well oil  discovery  has  begun,  and
drilling  on the  Adam 5 well  began in  July.  Two  wells  are  planned  in the
Pioneer-operated  Jenein  Nord  block by year end,  and one well is  anticipated
during the second half in the Borj El Khadra block.

Pioneer  increased  its 2006  capital  budget by $100  million to $1.4  billion,
excluding  discontinued  operations,  to  accelerate  successful  Edwards  Trend
activities  and fund new  shale gas  acreage  additions  and core  area  bolt-on
acquisitions.


Financial Review

Second quarter oil sales  averaged  24,571 barrels per day (BPD) and natural gas
liquids sales averaged 19,143 BPD. Gas sales in the second quarter  averaged 331
million cubic feet per day. The reported price for oil was $69.71 per barrel and
included  $13.00 per  barrel  related to  deferred  revenue  from VPPs for which
production  is not  recorded.  The price for  natural gas liquids was $36.32 per
barrel.  The reported  price for gas was $6.25 per thousand cubic feet (Mcf) and
included $.62 per Mcf related to deferred revenue from VPPs for which production
is not recorded.

Second quarter  production  costs  averaged  $11.45 per barrel of oil equivalent
(BOE).  Exploration and  abandonment  costs were $42 million for the quarter and
included  $13  million  of  unsuccessful   Alaskan  drilling  costs,   primarily
associated  with the Cronus and  Antigua  wells,  $24  million of  geologic  and
geophysical  expenses  including  seismic and personnel  costs and $5 million of
other drilling and acreage costs.

Financial Outlook

The following  statements  are estimates  based on current  expectations.  These
forward-looking  statements  are subject to a number of risks and  uncertainties
that may cause the  Company's  actual  results  to  differ  materially  from the
following  statements.  The last paragraph of this release  addresses certain of
the risks and uncertainties to which the Company is subject.






Third quarter 2006  production is expected to average  95,000 to 100,000  BOEPD.
Third quarter  production costs  (including  production and ad valorem taxes and
transportation  costs) are expected to average $11.00 to $12.00 per BOE based on
current  NYMEX  strip  prices  for  oil and  gas.  Depreciation,  depletion  and
amortization expense is expected to average $9.50 to $10.50 per BOE.

Total  exploration and abandonment  expense during the third quarter is expected
to be $20 million to $65  million  and could  include up to $15 million of costs
associated  with the  high-impact  drilling  of a new  prospect  adjacent to the
Company's Clipper  discovery  (deepwater Gulf of Mexico) and an onshore Norphlet
prospect  (Mississippi).  It could also  include  $25  million  associated  with
lower-risk  resource plays in the Edwards Trend in South Texas, Uinta / Piceance
in the Rockies,  Canada and Tunisia.  In addition,  exploration expense includes
$20  million to $25 million for seismic  investments  and  personnel,  primarily
related to the onshore resource plays Pioneer is currently pursuing. General and
administrative  expense is expected to be $29 million to $32  million.  Interest
expense is expected to be $22 million to $25 million,  offset by interest income
of $3  million  to  $5  million.  Accretion  of  discount  on  asset  retirement
obligations is expected to be $1 million to $2 million.

The Company's third quarter  effective income tax rate is expected to range from
35% to 45% based on  current  capital  spending  plans.  Cash  income  taxes are
expected  to range  from $5  million  to $15  million,  principally  related  to
Tunisian income taxes and nominal alternative minimum tax in the U.S.

The  Company's  financial  results  and oil and gas hedges are  outlined  on the
attached schedules.

Earnings Conference Call

This morning at 10:00 a.m. Eastern, Pioneer will discuss its quarterly financial
and  operating  results  with an  accompanying  presentation.  The call  will be
webcast on Pioneer's website,  www.pxd.com. At the website, select `INVESTOR' at
the top of the page. For those who cannot listen to the live broadcast, a replay
will be  available  shortly  after the  call.  Or you may  choose to dial  (800)
474-8920  (confirmation  code:  1564263) to listen to the call by telephone  and
view the  accompanying  visual  presentation  at the website  above. A telephone
replay will be available by dialing (888) 203-1112 (confirmation code: 1564263).

Pioneer is a large  independent oil and gas exploration and production  company,
headquartered  in  Dallas,  with  operations  in the United  States,  Canada and
Africa. For more information, visit Pioneer's website at www.pxd.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,   the  ability  to  obtain
environmental  and  other  permits  and the  timing  thereof,  other  government
regulation  or action,  third  party  approvals,  international  operations  and
associated  international  political and economic instability,  litigation,  the
costs  and  results  of  drilling  and  operations,   availability  of  drilling
equipment,  Pioneer's ability to replace reserves,  implement its business plans
(including its plan to repurchase  stock), or complete its development  projects
as scheduled,  access to and cost of capital,  uncertainties  about estimates of
reserves, the assumptions underlying production forecasts,  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 (the "SEC").

Cautionary Note to U.S.  Investors -- The SEC permits oil and gas companies,  in
their filings with the SEC, to disclose only proved  reserves that a company has
demonstrated  by  actual   production  or  conclusive   formation  tests  to  be
economically  and legally  producible  under  existing  economic  and  operating
conditions.  Pioneer  uses  certain  terms in this  release,  such as  "resource
potential" or other descriptions of volumes of reserves potentially  recoverable
through  additional  drilling or recovery  techniques that the SEC's  guidelines
prohibit  Pioneer from including in filings with the SEC. These estimates are by
their nature more  speculative than estimates of proved reserves and accordingly
are subject to substantially greater risk of being recovered by Pioneer.





                        PIONEER NATURAL RESOURCES COMPANY
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (in thousands)



                                                                  June 30,        December 31,
                                                                    2006              2005
                                                                 -----------      ------------
                                                                 (Unaudited)

                                     ASSETS
                                                                            
Current assets:
   Cash and cash equivalents                                     $   457,042      $    18,802
   Accounts receivable, net                                          166,982          337,658
   Inventories                                                       115,917           79,659
   Prepaid expenses                                                    8,563           18,091
   Deferred income taxes                                             115,963          158,878
   Other current assets, net                                          30,604           10,716
                                                                  ----------       ----------
        Total current assets                                         895,071          623,804
                                                                  ----------       ----------
Property, plant and equipment, at cost:
   Oil and gas properties, using the successful efforts
     method of accounting                                          7,389,043        8,813,134
   Accumulated depletion, depreciation and amortization           (1,728,466)      (2,577,946)
                                                                  -----------      -----------
        Total property, plant and equipment                        5,660,577        6,235,188
                                                                  ----------       ----------
Goodwill                                                             311,346          311,651
Other assets, net                                                    200,434          158,591
                                                                  ----------       ----------
                                                                 $ 7,067,428      $ 7,329,234
                                                                  ==========       ==========

                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                                              $   238,410      $   345,204
   Interest payable                                                   30,500           40,314
   Income taxes payable                                               78,283           22,470
   Deferred revenue                                                  184,848          190,327
   Other current liabilities                                         349,047          435,040
                                                                  ----------       ----------
        Total current liabilities                                    881,088        1,033,355
                                                                  ----------       ----------
Long-term debt                                                     1,263,994        2,058,412
Deferred income taxes                                              1,050,236          767,329
Deferred revenue                                                     574,155          664,511
Other liabilities and minority interests                             383,028          588,525
Stockholders' equity                                               2,914,927        2,217,102
                                                                  ----------       ----------
                                                                 $ 7,067,428      $ 7,329,234
                                                                  ==========       ==========







                        PIONEER NATURAL RESOURCES COMPANY
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                    (in thousands, except for per share data)
                                   (Unaudited)



                                                   Three months ended         Six months ended
                                                        June 30,                   June 30,
                                                 ----------------------    ----------------------
                                                    2006        2005          2006         2005
                                                 ---------    ---------    ---------    ---------
                                                                            
Revenues and other income:
   Oil and gas                                   $ 407,570    $ 320,337    $ 787,038    $ 644,163
   Interest and other                                9,741       12,031       26,852       14,051
   Gain (loss) on disposition of assets, net        (3,403)         109       (3,476)       2,250
                                                  --------     --------     --------     --------
                                                   413,908      332,477      810,414      660,464
                                                  --------     --------     --------     --------
Costs and expenses:
   Oil and gas production                          103,066       79,640      197,749      160,584
   Depletion, depreciation and amortization         87,984       65,999      170,390      139,307
   Impairment of long-lived assets                     -            471          -            623
   Exploration and abandonments                     41,618       37,498      166,260       91,327
   General and administrative                       29,468       26,596       61,715       54,084
   Accretion of discount on asset retirement
      obligations                                    1,154        1,043        2,302        2,089
   Interest                                         22,766       29,403       59,342       62,149
   Other                                            11,759       15,713       16,813       24,554
                                                  --------     --------     --------     --------
                                                   297,815      256,363      674,571      534,717
                                                  --------     --------     --------     --------
Income from continuing operations before
   income taxes                                    116,093       76,114      135,843      125,747
Income tax provision                               (50,207)     (53,885)     (70,924)     (75,796)
                                                  --------     --------     --------     --------
Income from continuing operations                   65,886       22,229       64,919       49,951
Income from discontinued operations,
   net of tax                                       22,153      163,330      566,327      220,265
                                                  --------     --------     --------     --------
Net income                                       $  88,039    $ 185,559    $ 631,246    $ 270,216
                                                  ========     ========     ========     ========
Basic earnings per share:
   Income from continuing operations             $     .52    $     .16    $     .52    $     .35
   Income from discontinued operations,
      net of tax                                       .18         1.16         4.48         1.55
                                                  --------     --------     --------     --------
   Net income                                    $     .70    $    1.32    $    5.00    $    1.90
                                                  ========     ========     ========     ========
Diluted earnings per share:
   Income from continuing operations             $     .52    $     .16    $     .52    $     .35
   Income from discontinued operations,
      net of tax                                       .17         1.12         4.34         1.51
                                                  --------     --------     --------     --------
   Net income                                    $     .69    $    1.28    $    4.86    $    1.86
                                                  ========     ========     ========     ========
Weighted average shares outstanding:
   Basic                                           125,629      140,812      126,282      141,849
                                                  ========     ========     ========     ========
   Diluted                                         129,624      145,246      130,346      146,286
                                                  ========     ========     ========     ========






                        PIONEER NATURAL RESOURCES COMPANY
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                   (Unaudited)




                                                      Three months ended           Six months ended
                                                           June 30,                    June 30,
                                                   ------------------------    -------------------------
                                                      2006          2005          2006           2005
                                                   ----------    ----------    ----------    -----------
                                                                                 
Cash flows from operating activities:
   Net income                                      $   88,039    $  185,559    $  631,246    $   270,216
   Adjustments to reconcile net income to net
     cash provided by operating activities:
      Depletion, depreciation and amortization         87,984        65,999       170,390        139,307
      Impairment of long-lived assets                     -             471           -              623
      Exploration expenses, including dry holes        17,354        12,286       111,936         28,962
      Deferred income taxes                            50,223        41,030        67,184         56,376
      Loss (gain) on disposition of assets, net         3,403          (109)        3,476         (2,250)
      Loss on extinguishment of debt                    8,076         7,342         8,076          7,342
      Accretion of discount on asset retirement
         obligations                                    1,154         1,043         2,302          2,089
      Discontinued operations                          (1,002)       61,019      (540,655)       184,072
      Interest expense                                  2,118           865         5,165          1,062
      Commodity hedge related activity                 (6,061)       (7,666)       (5,553)       (10,727)
      Stock-based compensation                         10,824         8,018        18,310         13,170
      Amortization of deferred revenue                (47,886)      (20,449)      (95,835)       (32,074)
      Other noncash items                               5,810         1,553         9,524          5,699
   Changes in operating assets and liabilities,
    net of effects from acquisition:
      Accounts receivable, net                         37,050       (42,269)      163,165        (54,302)
      Inventories                                     (18,994)      (11,388)      (39,125)       (12,703)
      Prepaid expenses                                 14,228         3,359         1,964          5,808
      Other current assets, net                          (237)         (331)        9,192           (529)
      Accounts payable                                (19,993)       (8,029)     (113,641)         9,564
      Interest payable                                  8,826        11,895       (10,274)        (4,364)
      Income taxes payable                            (78,236)        9,144        55,815         11,919
      Other current liabilities                        (4,438)       (9,425)        8,927         (5,689)
                                                    ---------     ---------     ---------     ----------
Net cash provided by operating activities             158,242       309,917       461,589        613,571
Net cash provided by investing activities             343,536       266,099       965,291        659,228
Net cash used in financing activities                 (89,857)     (536,165)     (990,440)    (1,224,367)
                                                    ---------     ---------     ---------     ----------
Net increase in cash and cash equivalents             411,921        39,851       436,440         48,432
Effect of exchange rate changes on cash
   and cash equivalents                                 2,139         2,561         1,800          2,762
Cash and cash equivalents, beginning
   of period                                           42,982        16,039        18,802          7,257
                                                    ---------     ---------     ---------     ----------
Cash and cash equivalents, end of period           $  457,042    $   58,451    $  457,042    $    58,451
                                                    =========     =========     =========     ==========







                        PIONEER NATURAL RESOURCES COMPANY
                        SUMMARY PRODUCTION AND PRICE DATA
                                   (Unaudited)



                                                    Three months ended          Six months ended
                                                         June 30,                    June 30,
                                                   ----------------------    -----------------------
                                                     2006         2005         2006          2005
                                                   ---------    ---------    ---------    ----------
                                                                              
Average Daily Sales Volumes
  from Continuing Operations:
   Oil (Bbls) -                       U.S.            17,671       19,875       17,320       21,191
                                      Canada             307          210          292          186
                                      Africa           6,593       10,452        7,121       11,205
                                                   ---------    ---------    ---------    ---------
                                      Worldwide       24,571       30,537       24,733       32,582
                                                   =========    =========    =========    =========
   Natural gas liquids (Bbls) -       U.S.            18,731       14,834       18,455       16,154
                                      Canada             412          610          415          514
                                                   ---------    ---------    ---------    ---------
                                      Worldwide       19,143       15,444       18,870       16,668
                                                   =========    =========    =========    =========
   Gas (Mcf) -                        U.S.           286,270      252,047      280,553      267,477
                                      Canada          44,801       36,710       40,317       35,448
                                                   ---------    ---------    ---------    ---------
                                      Worldwide      331,071      288,757      320,870      302,925
                                                   =========    =========    =========    =========
Average Daily Sales Volumes
  from Discontinued Operations:
   Oil (Bbls) -                       U.S.               -          6,549        4,839        6,376
                                      Argentina        2,982        7,796        5,071        7,992
                                      Canada             -             45          -             57
                                                   ---------    ---------    ---------    ---------
                                      Worldwide        2,982       14,390        9,910       14,425
                                                   =========    =========    =========    =========
   Natural gas liquids (Bbls) -       U.S.               -             74          -             65
                                      Argentina          406        1,948          849        1,761
                                      Canada             -            264          -            224
                                                   ---------    ---------    ---------    ---------
                                      Worldwide          406        2,286          849        2,050
                                                   =========    =========    =========    =========
   Gas (Mcf) -                        U.S.             1,317      301,756       72,763      278,609
                                      Argentina       42,538      135,188       88,537      132,783
                                      Canada             173       10,472           87       12,910
                                                   ---------    ---------    ---------    ---------
                                      Worldwide       44,028      447,416      161,387      424,302
                                                   =========    =========    =========    =========
Average Reported Prices (a):
   Oil (per Bbl) -                    U.S.         $   69.43    $   30.13    $   64.82    $   29.71
                                      Canada       $   72.37    $   35.22    $   69.89    $   41.97
                                      Africa       $   70.34    $   51.84    $   64.73    $   47.82
                                      Worldwide    $   69.71    $   37.60    $   64.86    $   36.01

   Natural gas liquids (per Bbl) -    U.S.         $   35.84    $   28.34    $   34.81    $   27.14
                                      Canada       $   57.97    $   41.18    $   56.10    $   39.89
                                      Worldwide    $   36.32    $   28.85    $   35.28    $   27.54

   Gas (per Mcf) -                    U.S.         $    6.08    $    6.75    $    6.33    $    6.40
                                      Canada       $    7.35    $    6.17    $    7.48    $    6.07
                                      Worldwide    $    6.25    $    6.67    $    6.48    $    6.36
<FN>
- ---------------
(a)  Average prices are  attributable to continuing  operations and  include the
     results of hedging activities and amortization of VPP deferred revenue.
</FN>








                        PIONEER NATURAL RESOURCES COMPANY
                    SUPPLEMENTAL NON-GAAP FINANCIAL MEASURES
                                 (in thousands)
                                   (Unaudited)


     EBITDAX  and  discretionary  cash  flow  ("DCF")  (as  defined  below)  are
presented herein, and reconciled to the generally accepted accounting  principle
("GAAP")  measures of net income and net cash  provided by operating  activities
because  of their wide  acceptance  by the  investment  community  as  financial
indicators of a company's ability to internally fund exploration and development
activities  and to service or incur debt.  The Company  also views the  non-GAAP
measures of EBITDAX and DCF as useful  tools for  comparisons  of the  Company's
financial  indicators  with those of peer  companies  that  follow the full cost
method of accounting.  EBITDAX and DCF should not be considered as  alternatives
to net income or net cash provided by operating activities, as defined by GAAP.



                                                        Three months ended           Six months ended
                                                             June 30,                    June 30,
                                                     ------------------------    ------------------------
                                                        2006          2005          2006          2005
                                                     ----------    ----------    ----------    ----------
                                                                                   
   Net income                                        $   88,039    $  185,559    $  631,246    $  270,216
   Depletion, depreciation and amortization              87,984        65,999       170,390       139,307
   Impairment of long-lived assets                          -             471           -             623
   Exploration and abandonments                          41,618        37,498       166,260        91,327
   Accretion of discount on asset retirement
      obligations                                         1,154         1,043         2,302         2,089
   Interest expense                                      22,766        29,403        59,342        62,149
   Income tax provision                                  50,207        53,885        70,924        75,796
   Loss (gain) on disposition of assets, net              3,403          (109)        3,476        (2,250)
   Loss on extinguishment of debt                         8,076         7,342         8,076         7,342
   Discontinued operations                               (1,002)       61,019      (540,655)      184,072
   Current income taxes on discontinued operations        8,545         5,563       152,575         7,889
   Cash exploration expense on discontinued
      operations                                            634         3,213         2,145         6,230
   Commodity hedge related activity                      (6,061)       (7,666)       (5,553)      (10,727)
   Stock-based compensation                              10,824         8,018        18,310        13,170
   Amortization of deferred revenue                     (47,886)      (20,449)      (95,835)      (32,074)
   Other noncash items                                    5,810         1,553         9,524         5,699
                                                      ---------     ---------     ---------     ---------
      EBITDAX (a)                                       274,111       432,342       652,527       820,858

   Less: Cash interest expense                          (20,648)      (28,538)      (54,177)      (61,087)
         Current income taxes                            (8,529)      (18,418)     (156,315)      (27,309)
                                                      ---------     ---------     ---------     ---------
         Discretionary cash flow (b)                    244,934       385,386       442,035       732,462

   Less: Cash exploration expense                       (24,898)      (28,425)      (56,469)      (68,595)
         Changes in operating assets and liabilities    (61,794)      (47,044)       76,023       (50,296)
                                                      ---------     ---------     ---------     ----------

   Net cash provided by operating activities         $  158,242    $  309,917    $  461,589    $  613,571
                                                      =========     =========     =========     =========
<FN>
- -------------
(a)  "EBITDAX"   represents   earnings  before   depletion,   depreciation   and
     amortization  expense;  impairment of long-lived  assets;  exploration  and
     abandonments;  accretion  of  discount  on  asset  retirement  obligations;
     interest expense;  income taxes; gain or loss on the disposition of assets;
     loss  on  extinguishment   of  debt;   noncash  effects  from  discontinued
     operations;  commodity hedge related  activity;  stock-based  compensation;
     amortization of deferred revenue; and other noncash items.
(b)  Discretionary cash flow equals cash flows from operating  activities before
     changes in operating  assets and  liabilities  and before cash  exploration
     expense.

</FN>







                        PIONEER NATURAL RESOURCES COMPANY

                            SUPPLEMENTAL INFORMATION
                              As of August 1, 2006

                         Open Commodity Hedge Positions



                                                       2006
                                          ------------------------------
                                           Third     Fourth
                                          Quarter    Quarter      Year       2007       2008
                                          --------   --------   --------   --------   --------
                                                                       
Average Daily Oil Production Hedged:
     Swap Contracts:
     Volume (Bbl)                            5,000      5,000      5,000     10,000     10,000
     NYMEX price (Bbl)                    $  37.20   $  37.20   $  37.20   $  30.96   $  30.62
     Collar Contracts:
     Volume (Bbl)                            6,500      6,500      6,500      2,000         -
     NYMEX price (Bbl):
         Ceiling                          $  66.41   $  66.41   $  66.41   $  89.50   $     -
         Floor                            $  41.92   $  41.92   $  41.92   $  50.00   $     -

Average Daily Gas Production Hedged:
     Swap Contracts:
     Volume (MMBtu)                         73,880     73,984     73,932     59,195     15,000
     NYMEX price (MMBtu) (a)              $   4.30   $   4.30   $   4.30   $   7.75   $   9.10
     Collar Contracts:
     Volume (MMBtu)                         85,000     95,000     90,000         -          -
     NYMEX price (MMBtu) (a):
         Ceiling                          $  15.00   $  15.25   $  15.15   $     -    $     -
         Floor                            $   6.95   $   6.95   $   6.95   $     -    $     -
<FN>
- ---------------
(a) Approximate, based on historical differentials to index prices.
</FN>



Amortization of Volumetric Production Payment Proceeds and Net Derivative Losses
                                 (in thousands)



                                                    2006
                                     -----------------------------------
                                       Third       Fourth
                                      Quarter      Quarter        Year         2007      Thereafter      Total
                                     ---------    ---------    ---------    ---------    ----------    ---------
                                                                                     
VPP proceeds, net of
   transaction costs                 $  45,838    $  45,527    $  91,365    $ 175,216    $ 460,322     $ 726,903
Net hedge obligations assigned           1,558        1,569        3,127        6,016       22,957        32,100
                                      --------     --------     --------     --------     --------      --------
Total deferred revenue (a)              47,396       47,096       94,492      181,232      483,279       759,003
Less net derivative losses to be
   recognized in pretax earnings (b)       274         (396)        (122)      (3,540)     (17,117)      (20,779)
                                      --------     --------     --------     --------     --------      --------
Total VPP impact to pretax
    earnings                         $  47,670    $  46,700    $  94,370    $ 177,692    $ 466,162     $ 738,224
                                      ========     ========     ========     ========     ========      ========
<FN>
- --------------
(a)  Deferred  revenue  will be  amortized  as increases to oil and gas revenues
     during the indicated future periods.
(b)  Represents the remaining pretax earnings impact of the derivatives assigned
     in the VPPs.
</FN>