EXHIBIT 99.1



                                  NEWS RELEASE

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


            Pioneer Reports Fourth Quarter and Full Year 2006 Results

Dallas,  Texas, February 6, 2007 -- Pioneer Natural Resources Company (NYSE:PXD)
today announced  financial and operating  results for the quarter and year ended
December 31, 2006.

     o    Net income for the fourth quarter was $28 million, or $.22 per diluted
          share.
     o    Fourth quarter oil and  gas sales from continuing  operations averaged
          100,799 barrels oil equivalent per day (BOEPD).
     o    North  American  production for the  year  rose  12%  from  equivalent
          volumetric production payment (VPP) adjusted 2005 levels.
     o    Total  production  rose  7% to  35.9  million  barrels  oil equivalent
          (MMBOE) from  equivalent VPP  adjusted  2005  levels.  On a  per share
          basis, total production was up 19%.
     o    During 2006,  8.8 million shares were repurchased at $39.16 per share,
          essentially  completing  the  $1  billion  share  repurchase   program
          authorized by the board of directors in September 2005.
     o    Net debt-to-book capitalization  ended the year at 33%, reflecting the
          Company's strong balance sheet.
     o    Net proved  reserves of 91 MMBOE  were added  in 2006 at a finding and
          development cost of $18.36 per barrel oil equivalent (BOE),  resulting
          in reserve replacement of 200% of production.

Income  from  continuing  operations  for the  fourth  quarter  of 2006  was $27
million,  or $.22 per diluted  share,  as compared to $83  million,  or $.64 per
diluted share, for the fourth quarter of 2005. Income from continuing operations
for the fourth quarter of 2006 included the following unusual items:

     o    incremental reclamation charge of $33 million ($21 million or $.17 per
          diluted share after taxes)  resulting from the denial of the Company's
          application to "reef-in-place" the debris from  East Cameron 322 which
          was destroyed in Hurricane Rita,
     o    estimated insurance recoveries for debris removal associated with East
          Cameron  322 of  $43 million  ($27 million  or $.22  per diluted share
          after taxes) and
     o    a charge  of $18 million  ($13 million or $.11 per diluted share after
          taxes)  related  to  previously  drilled  discoveries  that  had  been
          suspended  pending  additional  commercialization,   appraisal  and/or
          technical work.

Scott D. Sheffield,  Pioneer's  Chairman and CEO, stated,  "Throughout  2006, we
demonstrated that we can deliver strong,  consistent  production growth in North
America.  We expanded our  resource  base and made  significant  progress on two
multi-year  development  projects.  Our low-risk  onshore  development  programs
continue to deliver high returns,  and with the contributions  from our resource
plays,  especially in the Edwards Trend,  and the initiation of production  from
the South Coast Gas project during the second half of 2007,  we've laid a strong
foundation for achieving our 10+% production growth target for 2007."







For the twelve months ended December 31, 2006,  net income was $740 million,  or
$5.81 per diluted  share,  compared to $535 million,  or $3.80 per diluted share
for the prior year. Income from continuing operations was $172 million, or $1.36
per  diluted  share,  compared  to income  from  continuing  operations  of $195
million, or $1.40 per diluted share, for the same period in 2005.

Operations Review

For 2006, Pioneer posted outstanding operating results,  drilling  approximately
1,100 wells with 96% success.  In the Permian  Basin,  Pioneer  drilled over 300
wells in 2006, up from 190 wells during 2005, and increased Spraberry production
by 21%.  Successful  drilling in the deeper  Wolfcamp  formation  contributed to
these  strong  results.   The  Company  completed  several   attractive  bolt-on
acquisitions  which added  approximately  230,000 gross  leasehold  acres in the
Spraberry field with estimated resource potential of more than 50 MMBOE.

In the  Raton  field,  Pioneer  drilled  approximately  300  wells  in 2006  and
increased annual production by 10%, supported by pipeline expansion and improved
compression. In South Texas, Pioneer focused on testing prospects with potential
to further  expand the Edwards  Trend play,  drilling six new  discoveries  with
total program success of 88%.

In Canada,  annual  production  rose 18% during  2006,  supported  by a 150-well
Horseshoe Canyon CBM drilling program. In Tunisia, drilling success continued in
the Adam Concession during 2006 and was extended to two adjacent blocks in early
2007.  Recent  discoveries in each of the three areas have tested  approximately
13,000 BOPD on a combined gross basis.  New 3-D seismic was acquired during 2006
to further optimize the drilling program going forward.

On the North Slope of Alaska, Pioneer completed the construction, contouring and
armoring of the gravel drill site for its Oooguruk  development  project  during
2006.  Currently,   winter-access  construction  activities  are  underway  with
development  drilling anticipated to begin in late 2007 and first oil production
in 2008.

Offshore  South  Africa,  significant  progress  was made on the South Coast Gas
project  during 2006.  Development  wells were drilled and subsea  equipment was
fabricated in anticipation of first production during the second half of 2007.

Tim  Dove,   Pioneer's  President  and  Chief  Operating  Officer,   stated,  "I
congratulate  our  operations  teams for their success in executing the shift in
our focus to lower-risk  opportunities,  primarily in North America.  The strong
results delivered in 2006 support our confidence in our people and our expanding
portfolio of growth opportunities in achieving continued success in 2007."

Financial Review

Fourth quarter oil sales  averaged  25,004 barrels per day (BPD) and natural gas
liquids sales averaged 18,708 BPD. Gas sales in the fourth quarter  averaged 343
MMcfpd. The reported price for oil was $61.67 per barrel and included $12.58 per
barrel  related  to  deferred  revenue  from VPPs for which  production  was not
recorded.  The price for natural gas liquids was $32.78 per barrel. The reported
price for gas was $5.67 per Mcf,  including  $.58 per Mcf  related  to  deferred
revenue from VPPs for which production was not recorded.

Fourth  quarter  production  costs  averaged  $10.52  per BOE and were less than
expected due to lower than anticipated 2006 ad valorem taxes.







Exploration and abandonment  costs were $96 million for the quarter and included
$44 million of unsuccessful drilling costs, $18 million of costs associated with
previously drilled discoveries that will not be developed (included with unusual
items noted above), $32 million of geologic and geophysical expenses,  including
seismic and  personnel  costs,  and $2 million of acreage and other  costs.  Net
activity  related to the abandonment of East Cameron 322 resulted in an increase
to  earnings  of $10  million  (included  with  unusual  items  noted  above and
representing  incremental abandonment charges of $33 million more than offset by
$43 million of estimated insurance recoveries).

Comparable sales for the fourth quarter 2005,  adjusted to exclude  discontinued
operations from asset  divestitures  and assuming that the 2006 VPP volumes were
in place for all of the 2005 quarter, averaged 95,166 BOEPD. Adjusted to exclude
only  discontinued  operations,  sales  averaged  103,906 BOEPD and included oil
sales of 32,357 BPD,  natural  gas liquids  sales of 19,568 BPD and gas sales of
312 MMcfpd.  Reported  prices for fourth quarter 2005 were $40.33 per barrel for
oil,  $37.22 per  barrel  for  natural  gas  liquids  and $8.10 per Mcf for gas,
including  $.76  per Mcf  related  to  deferred  revenue  from  VPPs  for  which
production was not recorded.

Full-year 2006 oil and gas sales averaged  98,382 BOEPD,  including oil sales of
24,540 BPD, natural gas liquids sales of 18,951 BPD and gas sales of 329 MMcfpd.
Reported  prices for 2006 were $65.51 per barrel for oil and included $12.96 per
barrel  related  to  deferred  revenue  from VPPs for which  production  was not
recorded,  $35.64 per barrel for  natural gas liquids and $6.23 per Mcf for gas,
including  $.62  per Mcf  related  to  deferred  revenue  from  VPPs  for  which
production was not recorded.

Comparable  oil  and  gas  sales  for  full-year  2005  (excluding  discontinued
operations  and  assuming the 2005 and 2006 VPP volumes were in place for all of
2005) averaged 91,640 BOEPD.  Adjusted to exclude only  discontinued  operations
from  asset  divestitures,  full-year  2005 oil and gas sales  averaged  101,366
BOEPD,  including  oil sales of 32,217 BPD,  natural gas liquids sales of 17,906
BPD and gas sales of 307 MMcfpd. Reported prices for 2005 were $38.70 per barrel
for oil,  $32.12 per barrel for  natural  gas liquids and $7.02 per Mcf for gas,
including  $.68  per Mcf  related  to  deferred  revenue  from  VPPs  for  which
production was not recorded.

Financial Outlook

First quarter 2007  production is forecasted to average 97,000 to 102,000 BOEPD,
approximately  3,000  BOEPD lower than  anticipated  due to  significant  winter
weather downtime in the Raton, Hugoton and West Panhandle fields during January.
First quarter  production costs  (including  production and ad valorem taxes and
transportation  costs) are expected to average $11.25 to $12.25 per BOE based on
current  NYMEX  strip  prices  for oil and  gas.  Production  costs  per BOE are
forecasted  to be  approximately  $.25 per BOE higher in the first  quarter as a
result of the weather downtime and related repairs. Depreciation,  depletion and
amortization expense is expected to average $10.00 to $11.00 per BOE.

Total  exploration and abandonment  expense during the first quarter is expected
to be $50 million to $90  million  and could  include up to $25 million of costs
associated  with  high-impact  drilling in the NPR-A on Alaska's North Slope. It
could also include up to $30 million  associated with lower-risk  resource plays
in the  Edwards  Trend in South  Texas,  Uinta/Piceance  basins in the  Rockies,
Canada and  Tunisia and up to $5 million  for  acreage  and other  expenses.  In
addition,  exploration  expense is  expected  to include up to $30  million  for
seismic  investments and personnel,  primarily  related to the onshore  resource
plays Pioneer is currently progressing.







General and administrative expense is expected to be $30 million to $35 million,
including performance-related  compensation.  Interest expense is expected to be
$25  million  to  $28  million.   Accretion  of  discount  on  asset  retirement
obligations is expected to be $1 million to $2 million.

The Company's first quarter  effective income tax rate is expected to range from
37% 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.

The  Company's  financial  results  and oil and gas hedges are  outlined  on the
attached  schedules.  First  quarter  2007  amortization  of deferred  losses on
terminated oil and gas hedges is expected to be $33 million.

Earnings Conference Call

On Wednesday,  February 7 at 10:00 a.m.  Eastern Time,  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)  310-1961  (confirmation  code:  6881455) 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:
6881455).

Pioneer is a large  independent oil and gas exploration and production  company,
headquartered  in Dallas,  with operations in the United States,  Canada,  South
Africa  and  Tunisia.   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,
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.  Pioneer  undertakes  no duty  to  publicly  update  these
statements except as required by law.






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





                                                              December 31,    December 31,
                                                                  2006            2005
                                                              -----------     -----------
                                                              (Unaudited)
                                     ASSETS
                                                                        
Current assets:
   Cash and cash equivalents                                  $     7,033     $    18,802
   Accounts receivable, net                                       199,371         337,658
   Income taxes receivable                                         24,693           1,198
   Inventories                                                     95,131          79,659
   Prepaid expenses                                                11,509          18,091
   Deferred income taxes                                           82,927         158,878
   Other current assets, net                                      115,894           9,518
                                                              -----------     -----------
        Total current assets                                      536,558         623,804
                                                              -----------     -----------
Property, plant and equipment, at cost:
   Oil and gas properties, using the successful efforts
     method of accounting                                       8,178,052       8,813,134
   Accumulated depletion, depreciation and amortization        (1,895,408)     (2,577,946)
                                                              ------------    -----------
        Total property, plant and equipment                     6,282,644       6,235,188
                                                              -----------     -----------
Deferred income taxes                                                 345               -
Goodwill                                                          309,908         311,651
Other assets, net                                                 225,944         158,591
                                                              -----------     -----------
                                                              $ 7,355,399     $ 7,329,234
                                                              ===========     ===========

                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Accounts payable                                           $   349,820     $   345,204
   Interest payable                                                31,008          40,314
   Income taxes payable                                            12,865          22,470
   Deferred revenue                                               181,232         190,327
   Other current liabilities                                      312,054         435,040
                                                              -----------     -----------
        Total current liabilities                                 886,979       1,033,355
                                                              -----------     -----------
Long-term debt                                                  1,497,162       2,058,412
Deferred income taxes                                           1,172,507         767,329
Deferred revenue                                                  483,279         664,511
Other liabilities and minority interests                          330,801         588,525
Stockholders' equity                                            2,984,671       2,217,102
                                                              -----------     -----------
                                                              $ 7,355,399     $ 7,329,234
                                                              ===========     ===========








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




                                                       Three months ended                Year ended
                                                           December 31,                 December 31,
                                                   -------------------------     ---------------------------
                                                      2006           2005           2006             2005
                                                   ----------     ----------     -----------     -----------

                                                                                     
Revenues and other income:
   Oil and gas                                     $  376,905     $  419,398     $ 1,582,049     $ 1,453,240
   Interest and other                                  16,642          9,595          58,723          31,531
   Gain (loss) on disposition of assets, net           (3,707)        57,202          (7,891)         59,827
                                                   ----------     ----------     -----------     -----------
                                                      389,840        486,195       1,632,881       1,544,598
                                                   ----------     ----------     -----------     -----------
Costs and expenses:
   Oil and gas production                              97,539         93,046         398,257         346,439
   Depletion, depreciation and amortization            93,845         84,801         359,523         299,944
   Impairment of long-lived assets                          -              -               -             644
   Exploration and abandonments                        96,065         48,445         264,145         163,323
   General and administrative                          29,694         30,336         121,830         114,237
   Accretion of discount on asset retirement
     obligations                                        1,356          1,026           4,826           4,209
   Interest                                            24,104         35,075         107,032         126,086
   Hurricane activity, net                            (10,000)         7,000          32,000          39,813
   Other                                                4,688         40,698          36,280          99,437
                                                   ----------     ----------     -----------     -----------
                                                      337,291        340,427       1,323,893       1,194,132
                                                   ----------     ----------     -----------     -----------
Income from continuing operations before
     income taxes                                      52,549        145,768         308,988         350,466
Income tax provision                                  (25,472)       (62,598)       (136,666)       (155,832)
                                                   ----------     ----------     -----------     -----------
Income from continuing operations                      27,077         83,170         172,322         194,634
Income from discontinued operations, net of tax           609         57,609         567,409         339,934
                                                   ----------     ----------     -----------     -----------
Net income                                         $   27,686     $  140,779     $   739,731     $   534,568
                                                   ==========     ==========     ===========     ===========
Basic earnings per share:
   Income from continuing operations               $      .22     $      .66     $      1.39     $      1.42
   Income from discontinued operations
     net of tax                                           .01            .45            4.56            2.48
                                                   ----------     ----------     -----------     -----------
   Net income                                      $      .23     $     1.11     $      5.95     $      3.90
                                                   ==========     ==========     ===========     ===========
Diluted earnings per share:
   Income from continuing operations               $      .22     $      .64     $      1.36     $      1.40
   Income from discontinued operations,
     net of tax                                             -            .44            4.45            2.40
                                                   ----------     ----------     -----------     -----------
   Net income                                      $      .22     $     1.08     $      5.81     $      3.80
                                                   ==========     ==========     ===========     ===========
Weighted average shares outstanding:
   Basic                                              120,914        127,243         124,359         137,110
                                                   ==========     ==========     ===========     ===========
   Diluted                                            123,067        131,465         127,608         141,417
                                                   ==========     ==========     ===========     ===========








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




                                                            Three months ended               Year ended
                                                                December 31,                December 31,
                                                        -------------------------     --------------------------
                                                            2006          2005           2006            2005
                                                        ----------     ----------     ----------     -----------

                                                                                         
Cash flows from operating activities:
  Net income                                            $   27,686     $  140,779     $  739,731     $   534,568
  Adjustments to reconcile net income to net
    cash provided by operating activities:
      Depletion, depreciation and amortization              93,845         84,801        359,523         299,944
      Impairment of long-lived assets                            -              -              -             644
      Exploration expenses, including dry holes             62,160         18,731        148,077          53,489
      Hurricane activity                                    33,000          7,000         75,000          39,813
      Deferred income taxes                                 44,391         44,228        154,911         104,987
      Loss (gain) on disposition of assets, net              3,707        (57,202)         7,891         (59,827)
      Loss on extinguishment of debt                             -              -          8,076          25,975
      Accretion of discount on asset retirement
         obligations                                         1,356          1,026          4,826           4,209
      Discontinued operations                                6,830        114,076       (537,073)        376,952
      Interest expense                                       3,520          1,844         11,042           4,399
      Commodity hedge related activity                      (2,078)        30,306        (11,498)         21,237
      Amortization of stock-based compensation               6,708          7,238         32,065          26,857
      Amortization of deferred revenue                     (47,096)       (21,817)      (190,327)        (75,773)
      Other noncash items                                    1,571         10,182         15,589          19,940
  Changes in operating assets and liabilities, net
   of effects from acquisitions
    and dispositions:
      Accounts receivable, net                             (40,454)       (82,760)       121,360        (128,015)
      Income taxes receivable                              (23,426)           382        (23,495)         (1,198)
      Inventories                                            4,053        (15,281)       (48,060)        (36,948)
      Prepaid expenses                                       4,517            201          4,808          (7,504)
      Other current assets, net                            (44,531)          (484)       (42,484)            972
      Accounts payable                                     (14,832)        60,335        (36,085)         83,960
      Interest payable                                       4,976         18,842         (6,500)         (7,115)
      Income taxes payable                                 (21,515)         3,345         (3,695)          8,950
      Other current liabilities                             (6,230)         1,677        (28,854)        (13,362)
                                                       -----------     ----------     ----------     -----------
Net cash provided by operating activities                   98,158        367,449        754,828       1,277,154
Net cash provided by (used in) investing
  activitites                                             (452,597)      (217,514)       145,515          84,734
Net cash provided by (used in) financing
  activities                                               261,683       (195,552)      (913,543)     (1,353,634)

Net increase (decrease) in cash and cash
  equivalents                                              (92,756)       (45,617)       (13,200)          8,254
Effect of exchange rate changes on cash and
  cash equivalents                                            (283)           (89)         1,431           3,291
Cash and cash equivalents, beginning of period             100,072         64,508         18,802           7,257
                                                        ----------     ----------     ----------     -----------
Cash and cash equivalents, end of period                $    7,033     $   18,802     $    7,033     $    18,802
                                                        ==========     ==========     ==========     ===========








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




                                                         Three months ended         Year ended
                                                             December 31,           December 31,
                                                        -------------------     -------------------
                                                          2006        2005        2006        2005
                                                        -------     -------     -------     -------

                                                                             
Average Daily Sales Volumes
  from Continuing Operations:
   Oil (Bbls) -                          U.S.            18,639      23,877      17,716      21,942
                                         Canada             347         258         311         210
                                         Africa           6,018       8,222       6,513      10,065
                                                        -------     -------     -------     -------
                                         Worldwide       25,004      32,357      24,540      32,217
                                                        =======     =======     =======     =======

   Natural gas liquids (Bbls) -          U.S.            18,156      19,087      18,488      17,403
                                         Canada             552         481         463         503
                                                        -------     -------     -------     -------
                                         Worldwide       18,708      19,568      18,951      17,906
                                                        =======     =======     =======     =======

   Gas (Mcf) -                           U.S.           291,509     274,671     284,732     271,033
                                         Canada          46,280      37,220      43,420      36,427
                                         Africa           4,740           -       1,195           -
                                                        -------     -------     -------     -------
                                         Worldwide      342,529     311,891     329,347     307,460
                                                        =======     =======     =======     =======

Average Daily Sales Volumes
  from Discontinued Operations:
   Oil (Bbls) -                          U.S.                 -       4,688       2,400       5,280
                                         Argentina            -       7,564       2,515       7,869
                                         Canada               -           -           -          28
                                                        -------     -------     -------     -------
                                         Worldwide            -      12,252       4,915      13,177
                                                        =======     =======     =======     =======

   Natural gas liquids (Bbls) -          U.S.                 -           -           -          65
                                         Argentina            -       1,854         421       1,824
                                         Canada               -           -           -         112
                                                        -------     -------     --------    -------
                                         Worldwide            -       1,854         421       2,001
                                                        =======     =======     =======     =======

   Gas (Mcf) -                           U.S.               (36)    175,615      36,038     230,171
                                         Argentina            -     140,025      43,905     137,032
                                         Canada            (114)          -          14       6,489
                                                        -------     -------     -------     -------
                                         Worldwide         (150)    315,640      79,957     373,692
                                                        =======     =======     =======     =======

Average Reported Prices (a):
   Oil (per Bbl) -                       U.S.           $ 62.45     $ 33.71     $ 65.73     $ 32.01
                                         Canada         $ 54.02     $ 52.99     $ 65.57     $ 52.12
                                         Africa         $ 59.72     $ 59.16     $ 64.91     $ 53.00
                                         Worldwide      $ 61.67     $ 40.33     $ 65.51     $ 38.70

   Natural gas liquids (per Bbl) -       U.S.           $ 32.47     $ 36.80     $ 35.24     $ 31.72
                                         Canada         $ 43.23     $ 53.88     $ 51.47     $ 45.79
                                         Worldwide      $ 32.78     $ 37.22     $ 35.64     $ 32.12

   Gas (per Mcf) -                       U.S.           $  5.72     $  7.73     $  6.15     $  6.94
                                         Canada         $  5.33     $ 10.83     $  6.75     $  7.67
                                         Africa         $  5.97     $     -     $  5.97     $     -
                                         Worldwide      $  5.67     $  8.10     $  6.23     $  7.02

<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                Year ended
                                                                December 31,                 December 31,
                                                        -------------------------     -------------------------
                                                            2006          2005            2006           2005
                                                        ----------     ----------     ----------     ----------

                                                                                         
   Net income                                           $   27,686     $  140,779     $  739,731     $  534,568
   Depletion, depreciation and amortization                 93,845         84,801        359,523        299,944
   Impairment of long-lived assets                               -              -              -            644
   Exploration and abandonments                             96,065         48,445        264,145        163,323
   Hurricane activity                                       33,000          7,000         75,000         39,813
   Loss on extinguishment of debt                                -              -          8,076         25,975
   Accretion of discount on asset retirement
     obligations                                             1,356          1,026          4,826          4,209
   Interest expense                                         24,104         35,075        107,032        126,086
   Income tax provision                                     25,472         62,598        136,666        155,832
   Loss (gain) on disposition of assets, net                 3,707        (57,202)         7,891        (59,827)
   Discontinued operations                                   3,023        115,353       (385,737)       392,854
   Commodity hedge related activity                         (2,078)        30,306        (11,498)        21,237
   Amortization of stock-based compensation                  6,708          7,238         32,065         26,857
   Amortization of deferred revenue                        (47,096)       (21,817)      (190,327)       (75,773)
   Other noncash items                                       1,571         10,182         15,589         19,940
                                                        ----------     ----------      ---------      ---------
       EBITDAX (a)                                         267,363        463,784      1,162,982      1,675,682

   Less:  Cash interest expense                            (20,584)       (33,231)       (95,990)      (121,687)
          Current income taxes                              22,726        (18,375)      (130,936)       (57,683)
                                                        ----------     ----------      ---------      ---------
          Discretionary cash flow (b)                      269,505        412,178        936,056      1,496,312

   Less:  Cash exploration expense                         (33,905)       (30,986)      (118,223)      (118,898)
          Changes in operating assets and
            liabilities                                   (137,442)       (13,743)       (63,005)      (100,260)
                                                        ----------     ----------      ---------     ----------
   Net cash provided by operating activities            $   98,158     $  367,449     $  754,828     $1,277,154
                                                        ==========     ==========      =========     ==========
<FN>
- ------------
(a)  "EBITDAX"   represents   earnings  before   depletion,   depreciation   and
     amortization  expense;  impairment of long-lived  assets;  exploration  and
     abandonments; hurricane activity; accretion of discount on asset retirement
     obligations;   interest  expense;   income  taxes;  gain  or  loss  on  the
     disposition  of  assets;  loss on  extinguishment  of  debt;  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 February 5, 2007

                         Open Commodity Hedge Positions




                                                            2007
                                       -----------------------------------------------
                                        First       Second        Third       Fourth
                                       Quarter      Quarter      Quarter      Quarter        Year         2008
                                       --------     --------     --------     --------     --------     -------
                                                                                     
Average Daily Oil Production
Hedged:
    Swap Contracts:
    Volume (Bbl)                            689            -            -            -          170       4,000
    NYMEX price (Bbl)                  $  30.58     $      -     $      -     $      -     $  30.58     $ 32.00

Average Daily Gas Production
Hedged:
    Swap Contracts:
    Volume (MMBtu)                      107,063      185,000      185,000      185,000      165,783       15,000
    NYMEX price (MMBtu) (a)            $   8.69     $   8.54     $   8.54     $   8.54     $   8.56     $  9.10
    Collar Contracts:
    Volume (MMBtu)                       25,000            -            -            -        6,164           -
    NYMEX price (MMBtu) (a)
       Ceiling                         $  12.82     $      -     $      -     $      -     $  12.82     $     -
       Floor                           $  10.00     $      -     $      -     $      -     $  10.00     $     -
<FN>
- ---------------
(a)  Approximate, based on historical differentials to index prices.
</FN>



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




                                                             2007
                                       ----------------------------------------------
                                         First       Second       Third       Fourth
                                        Quarter      Quarter     Quarter      Quarter       2008     Thereafter    Total
                                       ---------    ---------    ---------   ---------    --------   ----------  ---------
                                                                                            
Unamortized VPP proceeds, net of
  transaction costs                    $  43,564    $  43,828    $  44,058   $  43,766    $152,304   $ 308,018   $ 635,538
Net hedge obligations assigned             1,470        1,495        1,520       1,531       5,834      17,123      28,973
                                       ---------    ---------    ---------   ---------    --------   ---------   ---------
Total deferred revenue (a)                45,034       45,323       45,578      45,297     158,138     325,141     664,511
Less derivative gains and (losses)
  to be recognized in pretax
  earnings (b)                            (3,765)         148          424        (347)     (4,373)    (12,744)    (20,657)
                                       ---------    ---------    ---------   ---------    --------   ---------   ---------
Total VPP impact to pretax earnings    $  41,269    $  45,471    $  46,002   $  44,950    $153,765   $ 312,397   $ 643,854
                                       =========    =========    =========   =========    ========   =========   =========
<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, which will be reflected in oil and gas revenues.
</FN>






                        PIONEER NATURAL RESOURCES COMPANY

                            SUPPLEMENTAL INFORMATION
                             As of February 5, 2007
                                   (continued)


                    Deferred Losses on Terminated Hedges (a)
                                 (in thousands)



                                                       2007
                                 ----------------------------------------------
                                   First       Second       Third       Fourth
                                  Quarter      Quarter     Quarter      Quarter       2008     Thereafter    Total
                                 ---------    ---------    --------    ---------    --------   ----------   ---------
                                                                                       
Commodity hedge losses (b)       $ (33,388)   $ (38,849)  $ (38,410)   $ (36,220)  $ (94,653)   $       -   $(241,520)
Debt hedge losses (c)                  (58)         (87)        (89)         (91)       (371)      (4,413)     (5,109)
                                 ---------    ---------   ---------    ---------   ---------    ---------   ---------
Total deferred losses            $ (33,446)   $ (38,936)  $ (38,499)   $ (36,311)  $ (95,024)   $  (4,413)  $(246,629)
                                 =========    =========   =========    =========   =========    =========   =========
<FN>
- --------------
(a)  Excludes deferred hedge gains and losses on terminated VPPs.
(b)  Deferred  commodity  hedge losses will be amortized as decreases to oil and
     gas revenues during the indicated future periods.
(c)  Deferred  debt hedge  losses will be  amortized  as  increases  to interest
     expense during the indicated future periods.
</FN>