Hart Energy 2014 DUG Permian Basin Conference Midland Basin's ...

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Hart Energy 2014 DUG Permian Basin Conference Midland Basin’s Spraberry/Wolfcamp: Most Active Play in the World and Accelerating Growth May 21, 2014

Forward-Looking Statements Except for historical information contained herein, the statements, charts and graphs in this presentation 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 commodity prices, product supply and demand, competition, the ability to obtain environmental and other permits and the timing thereof, other government regulation or action, the ability to obtain approvals from third parties and negotiate agreements with third parties on mutually acceptable terms, completion of planned divestitures, litigation, the costs and results of drilling and operations, availability of equipment, services, resources and personnel required to complete the Company's operating activities, access to and availability of transportation, processing, fractionation and refining facilities, Pioneer's ability to replace reserves, implement its business plans or complete its development activities as scheduled, access to and cost of capital, the financial strength of counterparties to Pioneer's credit facility and derivative contracts and the purchasers of Pioneer's oil, NGL and gas production, uncertainties about estimates of reserves and resource potential and the ability to add proved reserves in the future, the assumptions underlying production forecasts, quality of technical data, environmental and weather risks, including the possible impacts of climate change, the risks associated with the ownership and operation of the Company’s industrial sand mining and oilfield services businesses and 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. In addition, Pioneer may be subject to currently unforeseen risks that may have a materially adverse impact on it. Pioneer undertakes no duty to publicly update these statements except as required by law.

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Pioneer At A Glance Total Enterprise Value ($B) 2014 Drilling Capex ($B) Q1 2014 Production (MBOEPD) 2013 Reserves (BBOE) 2013 Reserves + Resource (BBOE)

~$30 $3.0 172 0.8 >11.0

Top U.S. Fields By Rig Count1 313

(Pioneer Operated Count in Green – 43 rigs) 218 204

 Resource-focused strategy, with activity concentrated in 2 of the most active U.S. fields

182 84

35

76

64

53

45

35

8

36

24

 Best performing energy stock in S&P 500 since 2009  Operating in core Spraberry/Wolfcamp asset since early 1980s

– PXD holds ~825,000 acres in Spraberry/Wolfcamp – Largest producer in Spraberry/Wolfcamp

1) Baker Hughes Rig Count (5/9/14) and PXD Internal

Spraberry/Wolfcamp Gross Production By Operator

93

(MBOEPD)1

– Preeminent, low-cost operator benefitting from vertical integration strategy  Attractive derivative positions protect margins – ~80% of Spraberry/Wolfcamp oil production

51 37

28

27

20

19

18

16

15

protected against volatility in Midland-Cushing oil price differential  Strong investment grade financial position 1) November 2013 IHS data, gross reported oil and wet gas

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Share Price Performance of Permian Basin Operators since 20091 Since 2009, the combined enterprise value for Permian-weighted companies listed has increased from $20 billion to $55 billion 1,200%

1,000%

800%

600%

400%

200%

Jan-09

PXD

Jan-10

CXO

LPI

Jan-11

FANG

XEC

Jan-12

AREX

EGN

1) LPI, FANG and RSPP’s price performance based on IPO price since respective IPO occurred after 1/1/2009

Jan-13

ATHL

RSPP

Jan-14

S&P 500

4

Geologic Provinces of the Permian Basin

Spraberry/ Wolfcamp Shale

Midland

Ozona Platform KS NM

OK TX

20 Miles

 Permian Basin is composed of multiple uplifts and basins that formed during the Pennsylvanian and early Permian ages  Spraberry/Wolfcamp Shale and deeper intervals are located in the Midland Basin of the Permian Basin  Spraberry/Wolfcamp field was discovered in 1943 with production commencing in 1949 5

Wolfcamp Depositional Model – Midland Basin Platform Carbonate

Midland Basin

CBP

Platform Carbonate

Land

Shelf Edge Carbonate

Clastic Detrital

Slope Sediments & Reef Talus

Fluvial - Deltaic

Carbonate Debris Flows

Delta

Carbonate Gravity Flows

Clastic Slope Sediments

Basinal Sediments

Clastic Gravity Flows

Land

Pelagic Sediments Silt Cloud in Suspension Anaerobic Zone (Organic-rich Sediments)

Midland

Marathon Thrust Belt Land

Marathon Thrust Belt

Pelagic Sed.

Glasscock Nose

Clastic Slope

Land

Wolfcamp Map Carbonate Slope

Platform Carbonate

Clastic Gravity Flow

Debris Flow

Older Wolfcamp Clastics

Carb Gravity Flow

North Basin Platform San Simon Channel

North Source: Adapted from Handford, 1981

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Midland Basin: Stacked Play Potential Clear Fork

U. Spraberry M. Spraberry Shale Jo Mill Shale L. Spraberry Shale Dean Wolfcamp A Wolfcamp B

 “Delta log R” (excess electrical resistance)  Red intervals indicate hydrocarbons  Petrophysical analysis indicates significantly more oil-in-place in the Wolfcamp and Spraberry Shale intervals in the Midland Basin compared to other major U.S. shale oil plays  Midland Basin: 13 horizontal play intervals identified (so far) — 10 intervals have been tested successfully — 3 additional intervals remain to be tested Eagle Ford Condensate

Barnett Combo

Niobrara

Bakken

Marcellus

200 ft

Midland Basin

Wolfcamp C Wolfcamp D “Cline” Strawn Atoka Barnett Miss Lime Woodford

Source: PXD

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Drilling Results Confirming Pioneer’s Midland Basin Sweet Spot PXD Wolfcamp B Prospectivity Map (Early 2013) Tier 1

Tier 2

2014 ITG Research Report Wolfcamp Test Rates Higher

Pioneer Land

Pioneer Wolfcamp B wells Wolfcamp B depth contour

Test Rate (BOEPD/1000’ lateral)

Source: ITG Investment Research

Lower

Source: Internal Pioneer developed in early 2013

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Pioneer’s Original Two Horizontal Giddings Wells (Average)1 Updated end of April

1,000

Giddings #2041H & Giddings #2073H – Wolfcamp B wells in southern Wolfcamp JV area (Upton County) ~5,300′ laterals; average cumulative production per well: 212 MBOE (70% oil)

BOEPD

500

800 MBOE 650 MBOE

100 0

100

200

300

400

Days

500

600

700

800

900

More than two years of production data for the original two 5,300′ Giddings Wolfcamp B horizontal wells supports an average EUR of 725 MBOE (equates to an average EUR of 950 MBOE for 7,000′ laterals) 1) Daily production normalized for operational shut-ins

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Pioneer’s First 6 Northern Horizontal Wolfcamp B and Wolfcamp A Shale Wells1 E.T. O'Daniel #1H – Wolfcamp B (Midland County); 9,229′ lateral Cumulative production: 165 MBOE (76% oil)

Updated end of April

Scharbauer Ranch #202H – Wolfcamp B (Martin County); 8,342′ lateral Cumulative production: 83 MBOE (74% oil) DL Hutt C #3H – Wolfcamp B (Midland County); 7,142′ lateral Cumulative production: 122 MBOE (73% oil)

3,000

DL Hutt C #2H – Wolfcamp A (Midland County); 7,380′ lateral Cumulative production: 174 MBOE (76% oil)

2,000

Mabee K #1H – Wolfcamp B (Martin County); 6,671′ lateral Cumulative production: 120 MBOE (73% oil)2

BOEPD

1,000

DL Hutt C #1H – Wolfcamp B (Midland County); 7,380′ lateral Cumulative production: 217 MBOE (73% oil)

500 1 MMBOE 800 MBOE

100 0

30

60

90

120

150

180

210 Days

240

270

300

330

360

390

420

Production data from these first 6 wells and 7 subsequent wells supports EURs for wells with ~7,000′ lateral lengths of:  1 MMBOE for Wolfcamp B wells in Midland County  800 MBOE for Wolfcamp A wells in Midland County and Wolfcamp B wells in Martin County 1) Daily production normalized for operational shut-ins 2) Mabee K #1H shut-in for offset frac; recently placed back on production and currently cleaning up; oil production is recovering to pre-frac levels

10

Pioneer’s First 4 Northern Horizontal Wolfcamp D Shale Wells1 University 7-43 #10H – Wolfcamp D (Andrews County); 7,382′ lateral Cumulative production: 76 MBOE (69% oil)

Updated end of April

E.T. O’Daniel #2H – Wolfcamp D (Midland County); 9,112′ lateral Cumulative production: 128 MBOE (70% oil)

3,000

Scharbauer Ranch #201H – Wolfcamp D (Martin County); 7,862′ lateral Cumulative production: 76 MBOE (60% oil)

2,000 DL Hutt C #4H – Wolfcamp D (Midland County); 6,962′ lateral Cumulative production: 95 MBOE (71% oil)

BOEPD

1,000

500 800 MBOE 650 MBOE

100 0

30

60

90

120 Days

150

180

210

240

Production data from these wells supports EURs of 650 MBOE to 800 MBOE for Wolfcamp D wells in Midland, Martin and Andrews counties with ~7,000′ lateral lengths 1) Daily production normalized for operational shut-ins

11

Pioneer’s First 5 Northern Horizontal Lower Spraberry Shale Wells1 Flanagan 14 Lloyd A #21H (Glasscock County); 7,212′ lateral Cumulative production: 88 MBOE (84% oil)

Updated end of April

Hutt C #21H (Midland County); 6,662′ lateral Cumulative production: 43 MBOE (77% oil) University 7-43 #16H (Andrews County); 7,502′ lateral Cumulative production: 73 MBOE (83% oil) Mabee K #10H (Martin County); 4,982′ lateral Cumulative production: 57 MBOE (89% oil)2

2,000

Scharbauer Ranch #501H (Martin County); 7,502′ lateral Cumulative production: 83 MBOE (83% oil)

BOEPD

1,000

500 1 MMBOE 800 MBOE 575 MBOE Shut-in due to severe weather

Lower Spraberry Shale wells typically take 30 – 60 days to reach a peak rate

100 0

30

60

90

Days 120

150

180

210

 Lower Spraberry Shale interval contains highest oil-in-place of all Spraberry/Wolfcamp Shale intervals  Production data from these wells and 1 subsequent well suggests EURs for Lower Spraberry Shale wells with 7,000′ lateral lengths will be 575 MBOE to 1 MMBOE 1) All wells on artificial lift, either ESPs or gas lift; daily production normalized for operational shut-ins 2) Mabee K #10H tracks above 800 MBOE EUR type curve if normalized to 7,000′ lateral

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Northern Horizontal Well Economics1,2 BTAX IRR 100+% 45% - 100+%

100+% 45% - 95%

Lower Spraberry Shale

Wolfcamp D

Midland County Wolfcamp A & Martin County Wolfcamp B

Midland County Wolfcamp B

EUR (MBOE)

575 – 1,000

650 - 800

800

1,000

D&C Cost ($MM)

$7.5

$8.5

$8.0

$8.0

Payout Years

1.0 - 2.5

1.3 - 2.4

1.1

1.0

1) Pricing: $90/BBL for oil and $4/MCF for gas 2) Reflects 7,000′ lateral length, single well drilling cost and no “science”

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Midland Basin Horizontal Resource Potential Continues to Grow 75 BBOE Recoverable Resource Potential (Up from 50 BBOE in 2013)

Wolfcamp C 2 BBOE

Wolfcamp D 13 BBOE

Wolfcamp B 27 BBOE

Spraberry Shales 14 BBOE

Wolfcamp A 19 BBOE

 75 BBOE recoverable resource potential in shale intervals where successful horizontal wells have been drilled  Assumes 140-acre spacing on 75% of acreage and downspacing to 100-acres on 25% of acreage; additional down-spacing potential exists  Additional horizontal potential from other intervals (e.g. Clearfork, Middle Spraberry 14 Shale, Atoka, Woodford)

Largest U.S. Oil Fields Estimated Recoverable Resource (BBOE)1 0

25

50

75

Spraberry/Wolfcamp Eagle Ford Shale Prudhoe Bay, AK Bakken Shale Delaware Basin East Texas Basin Midway-Sunset, CA Wilmington, CA Kuparuk River, AK Kern River, CA Thunder Horse, GOM Yates, West TX Belridge South, CA Wasson, West TX Elk Hills, CA Panhandle, TX

Spraberry/Wolfcamp is the largest oil field in the U.S. 1) Cumulative production + estimated remaining recoverable resource Source: DOE, EIA, ITG and other sources

15

Pioneer’s Significant Proved Reserves and Recoverable Resource Potential1 Proved Reserves + Estimated Net Recoverable Resource Potential of >11 BBOE >22,000 Horizontal Drilling Locations 12/31/13 Proved Reserves: 845 MMBOE2 Rockies 119 MMBOE Eagle Ford Shale 131 MMBOE 130 PUD locations

Additional Net Recoverable Resource Potential: 10.2 BBOE3

Mid-Continent 93 MMBOE

Other 70 MMBOE

Spraberry/Wolfcamp 432 MMBOE 640 PUD locations

Horizontal Spraberry/Wolfcamp4,5,6,7 9.6 BBOE 20,500 locations

Other9 180 MMBOE

Expect to add 600+ MMBOE of Spraberry/Wolfcamp horizontal reserves during 2014 - 2016 1) All drilling locations shown on a gross basis 2) Proved reserves use SEC pricing of $96.82/BBL for oil and $3.67/MMBTU for gas (NYMEX) 3) Net recoverable resource potential assumes $90/BBL for oil and $5/MMBTU for gas 4) On PXD’s northern acreage, assumes (i) average EURs of 800 MBOE per well for Wolfcamp A and B intervals, 650 MBOE for Wolfcamp D interval and 575 MBOE for Spraberry Shale intervals (Lower Spraberry Shale and Jo Mill Shale), (ii) 100-acre spacing on 50% of total acreage and (iii) 90% WI and 15% royalty 5) On PXD’s southern JV acreage, assumes (i) average EUR of 575 MBOE per well, (ii) 207,000 net acres, (iii) 100-acre spacing on 50% of total acreage, (iv) laterals in Wolfcamp A, B, C & D intervals, Lower Spraberry Shale interval and Jo Mill Shale interval and (v) 25% royalty and Pioneer’s 60% share 6) Excludes horizontal resource potential from additional intervals (e.g. Clearfork, Middle Spraberry Shale, Atoka, Woodford) and further downspacing opportunities 7) Vertical resource potential that was not converted to horizontal resource potential (e.g. Strawn, Atoka) is not included as PXD has no plans to drill vertical wells in the future except to meet continuous drilling obligations 8) Reflects primarily Upper Eagle Ford Shale potential and 500 additional locations from downspacing to ~300’ 9) Other net recoverable resource potential excludes Alaska and Barnett Shale

16

Spraberry/Wolfcamp Rig Count Counties: Andrews, Borden, Crockett, Dawson, Ector, Gaines, Glasscock, Howard, Irion, Martin, Midland, Mitchell, Reagan, Schleicher, Scurry, Sterling, Tom Green and Upton 350

58% Vertical Rigs 300

96% Vertical Rigs

250

200

Vertical Rigs

42% Horizontal Rigs (up from 23% in early 2013)

150

100

4% Horizontal Rigs 50

0

Source: Rig count data provided by Baker Hughes, 5/9/14

Horizontal Rigs

17

Production Growth Profiles For 3 Largest U.S. Oil Shale Plays Includes Horizontal Wells Only

10,000,000

Eagle Ford 196 Horizontal Rigs (down from 218 rigs in early 2013)

Gross Production (BOEPD)

1,000,000

Bakken 168 Horizontal Rigs (down from 176 rigs in early 2013)

100,000

Spraberry/Wolfcamp 131 Horizontal Rigs (up from 60 rigs in early 2013)

10,000

1,000

100 0

12

24

36

48

60

72

84

96

108

120

132

Months

Spraberry/Wolfcamp horizontal growth trajectory similar to Bakken and Eagle Ford Note: Production data is from IHS and represents incremental production for the play beginning when horizontal drilling activity began in earnest; Rig count data from Baker Hughes as of 5/9/14; Spraberry/Wolfcamp includes selected counties identified on slide titled “Spraberry/Wolfcamp Rig Count”; Initial month is November 2010 for Spraberry/Wolfcamp, April 2008 for Eagle Ford and January 2003 for Bakken

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Spraberry/Wolfcamp Production History Includes Vertical and Horizontal Wells

650,000 600,000 585,000

550,000

500,000

Spraberry/Wolfcamp production has increased ~425,000 BOEPD since 2009

400,000 350,000 300,000 250,000

Production (BOEPD)

450,000

200,000 150,000 100,000

Monthly Production

50,000

2013

2011

2009

2007

2005

2003

2001

1999

1997

1995

1993

1991

1989

1987

1985

1983

1981

1979

1977

1975

1973

1971

1969

1967

1965

-

 From 2009 to 2012, production growth primarily attributable to increased vertical activity  Post 2012, production growth expected to be driven by horizontal activity Source: IHS Energy through January 2014 for the Spraberry, Credo East, Garden City South and Lin Fields; 2-stream production data

19

Pace of Eagle Ford Production Growth is Slowing

Source: Credit Suisse, E&P Performance Monitor, April 28, 2014

20

Pace of Bakken Production Growth is Slowing North Dakota Daily Oil Production (MBOPD) 1,000

Daily Oil Production (MBOPD)

900

800 700 600 500 400 300 200 100 0 Jan-10

Jan-11

Jan-12

Source: North Dakota Industrial Commission, Department of Mineral Resources, Oil and Gas Division

Jan-13

Jan-14

21

Spraberry/Wolfcamp Horizontal Production Growth Profile

3.50

3.50

3.00

3.00

2.50 2.00 1.50

Other Operators2,3

1.00 0.50

2014

2016

2018

2020

2022

2.50

2.00

Other Operators2,3

1.50 1.00

Pioneer3,4

0.50

Pioneer3,4

0.00 1) 2) 3) 4)

PXD’s 120 HZ Rig Growth Scenario PXD adds ~10 HZ rigs/year for 10 years Assumes flat $95 oil & $4.50 gas

Gross Daily Production (MMBOEPD)

Gross Daily Production (MMBOEPD)

PXD’s 80 HZ Rig Growth Scenario PXD adds ~5 HZ rigs/year for 10 years Assumes strip pricing for oil & gas1

2024

0.00 2014

2016

2018

2020

As of 5/15/2014; oil price declines from $100 in 2014 to $81 in 2019+; gas price increases from $4.50 in 2014 to $5.00 in 2021+ Assumes PXD operates 1/3 of horizontal rigs in Spraberry/Wolfcamp and other operators account for 2/3 of horizontal rigs Assumes indicative EURs and lateral lengths across PXD acreage Includes royalty volumes, joint venture partner’s share of production in southern Wolfcamp and volumes for other small working interest owners

2022

2024

22

ITG’s Permian Basin Oil Growth Forecast 1-1.8 MMbbl/d Total Permian Growth by 2025 High Case 3.2 MMbbl/d by 2025

3,500

3,000

Wellhead Oil (MBbl/d)

2,500

Current 1.5 MMbbl/d

2,000

Base Case 2.5 MMbbl/d by 2025

1,500

Midland Basin

1,000

Delaware Basin

500

Other Permian

Source: ITG Investment Research

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

-

23

Primary Sources of Domestic Oil Growth

Bakken

Niobrara

Permian

Delaware Basin

Midland Basin Spraberry/Wolfcamp 75 BBOE Recoverable Resource Potential Eagle Ford Deepwater Gulf of Mexico 24

U.S. Production Forecast by Grade History

Forecast

12

10

Production (MMBPD)

~8 MMBPD 8

Light

6

4

2

Medium 0 2009

Heavy 2010

2011

2012 Heavy

Source: Turner, Mason & Company

2013

2014

Medium

2015 Light

2016

2017

2018

2019

2020

Condensate

25

U.S. Rig Activity Since 1990 1,800 1,600 1,400 1,200

U.S. Gas Rig Count

1,000 800

600 400

U.S. Oil Rig Count

200 Jan-90

Jan-94

Jan-98

Jan-02

Jan-06

Jan-10

Jan-14

26

Historical WTI and Brent Price Relationship Historical WTI and Brent Prices

WTI - Brent Price Differential

$30

$150

Brent

Relationship broke in January 2011

$20

$125

$100

$75

WTI

Oil Price ($/BBL)

Oil Price ($/BBL)

$10

-

$(10)

$(20)

($17/bbl)

$50

($23/bbl)

$(30)

$25 2006 Source: EIA

2007

2008

2009

2010

2011

2012

2013

2014

$(40) 2006 Source: EIA

($30/bbl)

2007

2008

2009

2010

2011

2012

2013

2014 27

U.S. PADD III (Gulf Coast) Crude Imports Since 2005 Majority of the light crude imports have been displaced, but mediums may be “stickier,” which could put a ceiling on U.S. production growth Oil Imports to PADD 3 7,000

Average API gravity of imported crude decreasing (right axis)

6,000

32.0

30.0

5,000

Light (API > 32°)

4,000

26.0 3,000

Intermediate (28° < API < 32°)

API Gravity

Oil (MBBL/D)

28.0

24.0 2,000

0 Jan-05 Source: EIA

22.0

Heavy (API < 28°)

1,000

20.0 Jan-06

Jan-07

Jan-08

Jan-09

Jan-10

Jan-11

Jan-12

Jan-13

Jan-14

28

Increased U.S. Petroleum Product Exports Over 10 Years U.S. Petroleum Product Exports (million barrels per day)

Product exports reached 4.3 MM in 12/2013

4.5 4.0

Gasoline 3.5

Kerosene & distillates driving growth

3.0 2.5

Kerosene & Distillates

2.0

Residual Fuel

1.5

LPG 1.0

Coke

0.5

Other 0.0 Jan-04

Jan-05

Jan-06

Jan-07

Jan-08

Jan-09

Source: EIA Other includes pentane plus, gasoline blending components and other products

Jan-10

Jan-11

Jan-12

Jan-13

29

WTI, Brent and PADD 3 Gasoline Price History 350

Gasoline prices are more closely tied to Brent than WTI

PADD 3 Gasoline Price

Price (Cents per Gallon)

300

Brent Price

250

200

WTI Price 150

100

50 Jan-06 Source: EIA

Jan-07

Jan-08

Jan-09

Jan-10

Jan-11

Jan-12

Jan-13

Jan-14

30

The Export Ban Threatens to Strand U.S. Crude  Downstream industry is responding to increased light production — Announced refinery and splitter investments, increased refinery utilization — Product exports are booming — Increased exports of crude to Canada for refining

 But production will soon outpace downstream industry responses — Nearly all light sweet imports have been displaced — Crude imports from Canada are increasing (including for re-export) — Heavy or medium to light refining slate adjustments economically limited

 The Gulf Coast is becoming saturated with domestic production

 Similar to Cushing in 2012, the U.S. will become a globally stranded location unless there is export relief — Producers will likely experience large price differentials to Brent — Supply glut will drive prices below costs for large number of producers

— A far-reaching discount blow-out clearly looms on the horizon

31

The Foreseeable Consequences of Inaction  Producers will be forced to lay down rigs

 Production growth will stall and production will quickly decline  A substantial portion of domestic natural gas production is associated with oil production – as crude production declines, so will natural gas supplies  Hundreds of thousands of jobs at risk – Industry supports 9.8 MM jobs and will create up to 1.7 million new jobs by 2020 (McKinsey)

 Less tax revenue for federal, state and local governments – Industry delivers $85 million per day in revenue to the federal government

 U.S. trade deficit will widen as foreign light crude oil imports resume – If ban is lifted, oil and gas trade balance forecasted to improve from $354 billion deficit in 2011 to $5 billion surplus in 2020 (Citi)

 Reduced gasoline prices to the U.S. consumer (Resources for the Future)

32

Banned Commodities Exports Only 3 commodities are included in the Export Administration Regulations’ “Short Supply Control” list1

Crude Oil

Unprocessed Western Red Cedar

Horses Exported by Sea

Source: BIS Short Supply Controls Part 754 1) Certain other items not on the “Short Supply Control” are prohibited for exports due to national security and foreign policy reasons

33

Certain Reserve Information Cautionary Note to U.S. Investors --The SEC prohibits oil and gas companies, in their filings with the SEC, from disclosing estimates of oil or gas resources other than “reserves,” as that term is defined by the SEC. In this news release, Pioneer includes estimates of quantities of oil and gas using certain terms, such as “resource potential,” “net recoverable resource potential,” “resource base,” “estimated ultimate recovery,” “EUR,” “oil-in-place” or other descriptions of volumes of reserves, which terms include quantities of oil and gas that may not meet the SEC’s definitions of proved, probable and possible reserves, and which the SEC's guidelines strictly 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. U.S. investors are urged to consider closely the disclosures in the Company’s periodic filings with the SEC. Such filings are available from the Company at 5205 N. O'Connor Blvd., Suite 200, Irving, Texas 75039, Attention: Investor Relations, and the Company’s website at www.pxd.com. These filings also can be obtained from the SEC by calling 1-800-SEC-0330.

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