Abraxas Petroleum (AXAS) 8-K Regulation FD Disclosure

October 12 -13, 2011

Miami, Florida

Exhibit 99.1

2

Forward-Looking Statements

The information presented herein may contain predictions, estimates and
other forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act of
1934.Although the Company believes that its expectations are based on
reasonable assumptions, it can give no assurance that its goals will be
achieved.

Important factors that could cause actual results to differ materially from
those included in the forward-looking statements include the timing and
extent of changes in commodity prices for oil and gas, the need to develop
and replace reserves, environmental risks, competition, government
regulation and the ability of the Company to meet its stated business
goals.

3

AXAS Highlights

§NASDAQ: AXAS

§Shares outstanding: ~92.1 million

§~40% institutional

§~10% insider

§Average trading volume: ~2.5 million shares per day

§Short position: ~23 million shares (09-15-11)

§Market capitalization: ~$275 million

§Long-term revolving bank debt:~$90 million

§2011 Capital program: $60 million+

§100% oil or liquids weighted

§2011 Production guidance(1):

§4,000 - 4,200 boe/d average

§4,700 - 4,900 boe/d exit rate

§2012 Capital program: TBD (Nov-11)

(1)Production guidance includes AXAS’ share of Blue Eagle’s production

4

Unique to AXAS

§Portfolio of unconventional oil assets

§50,000+ net acres: Bakken, Eagle Ford, Niobrara

§Acreage predominately held by production

§Operated operations in Bakken exclusively pad development

§Will continue non-op participation

5

AXAS Hedges

	2011	2012	2013	AVE.
OIL - weighted average price	$76.61	$70.89	$80.79	$75.69
% OIL PDP(1)	77%	80%	67%
GAS - weighted average price	$6.52	$6.77	$6.84	$6.69
% GAS PDP(1)	82%	81%	66%

NYMEX-based fixed price swaps:

(1)As of December 31, 2010

6

ND

MT

WY

CO

UT

TX

OK

LA

Proved Reserves (MMBoe)(1):
26.6

- Proved Developed:49%

- Oil/NGL %:42%
- Operated:81%

Abraxas Petroleum Corporation

(1)Net proved reserves as of December 31, 2010, including
AXAS’ 50% share of Blue Eagle’s proved reserves

(41% as of 06/30/11)

Bakken / Three Forks

Play

Barnett / Woodford

Shale Play

Wolfberry Trend

Rocky Mountain

Mid-Continent

Permian Basin

Gulf Coast

Eagle Ford Shale Play

High Quality Assets

Alberta

Niobrara Play

Alberta Basin

Bakken Play

Alberta

Wolfbone Play

7

Reserve / Production Summary

Proved Reserves(1) - 26.6 MMBoe

Production(2) - 3,845 Boepd

(1)Net proved reserves as of December 31, 2010, including AXAS’ 50% share of Blue Eagle’s proved reserves (41% as of 06/30/11)

(2)Daily net production for the quarter ended June 30, 2011, including AXAS’ 50% share of Blue Eagle’s production (41% as of 06/30/11)

Basin

21%

Basin

31%

Canada

1%

Canada

2%

8

AXAS Production

(1)Includes AXAS’ share of Blue Eagle’s production (50% in Q1 and Q2 2011 and 41% in July 2011)

Base production

Divestitures

Weather disruptions

34%35%36%39%42%49%50%>50%Oil/NGL %

(1)

(1)

(1)

Range of guidance

9

2011 Capital Budget

§Large inventory of drilling locations in unconventional and conventional oil plays

§1H:11 oil weighted drilling program focused on low-risk / high-return Texas conventional
oil projects

§2H:11 accelerate operated drilling activity in the Bakken and Three Forks plays

§Additional inventory of gas projects await higher gas prices (all HBP)

(1)Unrisked locations based on eight wells (four Bakken and four Three Forks) per 1,280 acre units; 160 acre spacing assumptions in the Eagle Ford Shale; 3-D identified locations in
the Niobrara Shale play

(2)Eagle Ford Shale acreage and locations are gross to the Blue Eagle JV which Abraxas owns a 50% equity interest(41% as of 06/30/11)

Project Area	Net Acres	Net Unrisked Locations(1)	2011 Drilling Program		2011 Net Capital ($MM)
			Gross	Net
Bakken / Three Forks	20,835	130	15.0	3.0	$25.5
Eagle Ford Shale(2)	12,073	75	4.0	4.0	$0.0
Niobrara Shale	17,800	56	2.0	2.0	$10.0
Pekisko Fairway	9,120	10	2.0	2.0	$4.0
Alberta Bakken	10,000	-	-	-	-
Texas Oil Plays	8,700	65	15.0	15.0	$14.1
Other	n/a	n/a	4.0	4.0	$6.4
Total:	78,528	336	42.0	30.0	$60.0

10

Bakken / Three Forks

Nesson

2,270 net acres

Elm Coulee

440 net acres

Elkhorn Ranch / Lewis & Clark

2,035 net acres

Harding / Rough Rider

7,010 net acres

Carter

3,200 net acres

Sheridan

2,340 net acres

North Fork / Nesson

3,540 net acres

§Gross / Net Acres:

§109,658 / 20,835

§~100% held by production

§Drilling Inventory:

§1,280 acre units

§~685 gross / 130 net

§4 Bakken / 4 Three Forks
wells

§Recent Activity:

§2 gross (1.4 net) operated
wells

§19 gross (1.0 net) non-
operated wells

§2011 Activity:

§$25.5 MM budget

§Long-term arrangements:

§Drilling rig (purchased)

§Completion services

Ravin 26-35 1H - TFS

Stenehjem 27-34 1H - Bakken

11

Why Drilling Rig?

§Economics:

§3 year cost to wells

§Contract - $29.6 MM

§Own - $16.4 MM

§Payout - 3 years

§Efficiency & Performance:

§In-house drilling rig management

§Company crews incentivized with company goals - not contractors

§Pad drilling allows semi-permanent man camp

§Control:

§Company makes decisions

§Leverage to increase land ownership

§Financing:

§Very favorable terms

12

AXAS operated wells

Three ForksBakken

AXAS non-operated wellslocationlocation

Bakken / Three Forks

§North Fork/Nesson:

§3,540 net acres

§1,280 acre units: 8 B/TF wells

§64 gross (19.7 net)

§Drilled: 4 gross (1.5 net)

§Locations: 60 gross (18.2 net)

§Economics:

§D&C Cost: $9.0 MM

§$7.5 MM (pad drilling)

§EUR: 500 Mboe

§87% Oil & NGLs

§IRR: ~30% (no acreage)

§~46% (pad drilling)

§Ravin 26-35 1H:

§Cumulative production (270 days):

§80,000 Boe

§86% Oil & NGLs

§Stenehjem 27-34 1H:

§Cumulative production (95 days):

§50,000 Boe

§84% Oil & NGLs

North Fork / Nesson

3,540 net acres

79% WI

2% WI

15% WI

6% WI

48% WI

7% WI

30% WI

Koeser (B)

Stenehjem (B)

Johnson (B)

Ravin (TF)

59% WI

<1% WI

13

Eagle Ford Shale

§Acreage:

§12,073 net

§Atascosa, DeWitt, Lavaca and McMullen
Counties, TX

§Drilling Inventory:

§75 net JV locations

§160 acre spacing

§Economics:

§D&C Cost: $8.5 MM

§EUR: 500 MBoe(1)

§Blue Eagle Joint Venture:

§Abraxas operator

§Rock Oil committed to fund up to $75 MM

§Upon full funding, AXAS equity interest - 25%

§$36 MM Rock Oil contribution to date

§41% equity interest (AXAS)

§Recent Activity:

§1st well: T Bird 1H - on production

§2nd well: Matejek Gas Unit 1 - on production

§3rd well: Grass Farms 1H - flowing back

§Acquired 2,487 net acres (McMullen Co.)

§Q4: drill two McMullen Co. wells

Lavaca County

Atascosa County

AXAS: Grass Farms 1H

DeWitt County

AXAS: T Bird 1H

TLM: Matejek Gas Unit 1

oil window

gas window

gas/condensate

window

(1) 1st JV Eagle Ford well - 1,100 MBoe of proved reserves

McMullen County

14

Drilling Inventory:

Nordheim Area -

§3,600 net acres

§160 acre spacing

§23 net wells

T Bird 1H:

§JV - 100% WI

§Op: AXAS

§TMD - 19,450’

§5,700’ lateral

§15-stage frac

§75 days (spud to on-line)

§Current:

800 Boepd

§Cumulative (235 days):

AXAS owns a 50% equity interest in the Blue Eagle joint venture

(41% as of 06/30/11)

Eagle Ford Shale

Nordheim Prospect

DeWitt County, TX

oil window

gas window

15

Campbell

Converse

Niobrara

Weston

Niobrara Shale

Converse / Niobrara Counties, Wyoming

CHK / EOG:

2 producing wells

9 permits

§Gross / Net Acres:

§20,720 / 17,800

§Primarily in Converse and Niobrara
Counties

§~90% held by production

§~2,100 net acres in Campbell County
directly offsetting EOG producing well

§Drilling Inventory:

§90 gross / 56 net locations

§3-D identified

§Economics:

§D&C Cost: $5.0 MM

§EUR: 250 MBoe

§Historical Activity:

§12 wells (2000 - 2009)

(7 horizontal / 5 vertical)

§1 vertical Niobrara

§2011 Activity:

§$10.0 MM to drill 2.0 gross/net wells

§1st well (Prairie Falcon 3H)

§w/o 15 stage frac

§4,500’ lateral

§Other:

§23 sq. miles proprietary 3D seismic
data

§Full-diameter core data

EOG Crossbow Area:

8 successful horizontal wells (Turner)

1-rig program

Typical well (Crossbow 7-06H)

30-day average: >700 Boepd

SWN / Helis:

1 producing well

14 permits

AXAS Activity:

Sage Grouse 3H:

(Cum Oil 25 MBbl / 50 MBbl EUR)

CHK:

Sims 15-26H:

(Cum Oil 20 MBbl / Gas 678 MMcf)

11 producing wells (Frontier/Niobrara)

4 permits

16

West Texas - Spires Ranch

§Economics:

§D&C Cost: $1.6 MM

§EUR: 160 MBoe

§80 MBbl oil

§200 MMcf sales gas

§45 MBbl NGL

§IRR: 160%

§Spires 126 1H:

§Cumulative production (190 days):

§16,000 Boe

§75% Oil & NGLs

§Spires 126 2H:

§Average daily production (70
days):

§100 Boepd

§74% Oil & NGLs

AXAS owns 100% working interest in Spires Ranch leasehold

5,600 net acres

Nolan
County

17

West Texas - Wolfbone

§April 2011 TX GLO Lease Sale:

§$5,295 / acre -

offsetting AXAS

§Current Industry Activity:

§2 CWEI-CHK wells -

offsetting AXAS

(completed - w/o results)

§Current Activity:

§AXAS Lindemann 24-1 -

w/o fracture stimulation

AXAS’ leasehold at Nine Mile Draw (100% WI)

Reeves
County

3,000 net acres

AXAS

Lindemann 24-1

(w/o frac)

18

Near-Term Drilling Catalysts

AXAS OPERATED:

OUTSIDE OPERATED:

Bakken/Three Forks, North Dakota •Stenehjem: on production •AXAS 79% •Horizontal drilling program •Purchased drilling rig •Spud 1st well: Fall 2011 Spires Ranch / NE Millican, West Texas •3 horizontal oil wells - 2 wells: on production •3rd well: drilling lateral •2 vertical oil wells - 2nd well: completing •AXAS 100% Eagle Ford, South Texas •Matejek 1H - on production •JV 44%(1) •Grass Farms 1H - flowing back •JV 100%(1) Pekisko, Alberta, Canada •2 horizontal oil wells - •1st well: completed (w/o facilities) •2nd well: completed (w/o facilities) •CANAXAS 100% Niobrara / Turner, Wyoming •2 horizontal oil wells - •1st well: w/o completion •AXAS 100%

Bakken/Three Forks, North Dakota / Montana •Continental operated •5 wells: 4 on production (2-TF, 2-B), 1 w/o rig •AXAS 4% •Denbury operated •2 wells: on production •AXAS 2-6% •TAQA operated •1 well: completing •AXAS 36% •Brigham operated •3 wells: on production •AXAS 1-7% •Whiting operated •1 well: on production •AXAS 13% •Petro-Hunt operated •1 well: drilling lateral •AXAS <1% •XTO Energy operated •1 well: on production •AXAS 1% Mission Canyon, North Dakota •True operated •2 horizontal wells: completed (w/o facilities) •AXAS 3-8%

(1) AXAS owns a 50% equity interest in the Blue Eagle joint venture (41% as of 06/30/11)

19

Business Plan

§2011 Capital Program: $60 MM+

§oil development

§Bakken/TFS - Accelerate with purchase of drilling rig

§Eagle Ford - Accelerate with JV

§Target - 50/50 oil/gas production mix

§Target - >90% operated

20

Appendix

21

Net Asset Value

(1)Includes identified and resource potential on Bakken, Niobrara, Eagle Ford, Pekisko and Texas oil plays. Excludes identified and resource reserves in Alberta Basin Bakken
and value of Eagle Ford joint venture drilling carry.The probable and possible reserve estimates do not necessarily represent reserves defined under SEC rules.

Net Asset Value per Share(1)

Proved Reserves Only

$ 2.46

Proved PLUS Probable Reserves

$ 13.82

Proved PLUS Probable PLUS
Possible Reserves

$ 28.54

22

(1)Eagle Ford Shale acreage and locations are net to AXAS’ 50% equity interest in the Blue Eagle JV (41% as of 06/30/11)

(2)Possible Bakken/Three Forks locations are based on three additional Bakken and four additional Three Forks wells per 1,280 acre unit

Note:The probable and possible reserve estimates do not necessarily represent reserves defined under SEC rules

NAV - Undiscounted

2010 PV-10 at Current Pricing
($100/$4.50)

$313,084,390

Net Cash

$2,000,000

Less Outstanding Debt

($90,000,000)

Basin

Net Undeveloped
Acres

Well Spacing /
Acre

Net Locations

Per Well Reserves
(BOE)

Reserve Potential
(BOE)

Bakken / Three Forks

20,835

1280

16.3

500,000

8,138,672

Eagle Ford Shale(1)

6,037

160

37.7

500,000

18,864,094

Pekisko Fairway

9,120

10.0

150,000

1,500,000

Texas Oil Plays

8,700

65.0

57,423

3,732,500

Probable Reserve Value @$30 Netback

$1,387,057,969

Probable Reserve Value/Share (Unrisked)

$15.15

2P NAV/Share (Risked)

$13.82

Possible

Net Undeveloped
Acres

Well Spacing /
Acre

Per Well Reserves
(BOE)

Reserve Potential
(BOE)

Eagle Ford Shale(1)

6,037

80

37.7

500,000

18,864,094

Possible Reserve Value @$30 Netback

$2,695,043,906

3P NAV/Share (Risked)

$28.54

23

(1)Eagle Ford Shale acreage and locations are net to AXAS’ 50% equity interest in the Blue Eagle JV (41% as of 06/30/11)

(2)Possible Bakken/Three Forks locations are based on three additional Bakken and four additional Three Forks wells per 1,280 acre unit

Note:The probable and possible reserve estimates do not necessarily represent reserves defined under SEC rules

NAV - PV Equivalent

2010 PV-10 at Current Pricing
($100/$4.50)

$313,084,390

Net Cash

$2,000,000

Less Outstanding Debt

($90,000,000)

Basin

Net Undeveloped
Acres

Well Spacing /
Acre

Net Locations

Per Well Reserves
(BOE)

Reserve Potential
(BOE)

Bakken / Three Forks

20,835

1280

16.3

500,000

8,138,672

Eagle Ford Shale(1)

6,037

160

37.7

500,000

18,864,094

Pekisko Fairway

9,120

10.0

150,000

1,500,000

Texas Oil Plays

8,700

65.0

57,423

3,732,500

Probable Reserve Value @$15 Netback

$693,528,984

Probable Reserve Value/Share (Unrisked)

$7.57

2P NAV/Share (Risked)

$8.14

Possible

Net Undeveloped
Acres

Well Spacing /
Acre

Per Well Reserves
(BOE)

Reserve Potential
(BOE)

Eagle Ford Shale(1)

6,037

80

37.7

500,000

18,864,094

Possible Reserve Value @$10 Netback

$898,347,969

3P NAV/Share (Risked)

$13.04

24

Low Risk Oil Development

West Texas - Spires Ranch

§Gross / Net Acres: 5,600 (100% WI)

§County: Nolan

§Formation: Strawn

§Locations: 10

§D&C: $1.6 MM / EUR: 160 MBoe

§2011 Capex / Activity:

§$4.8 MM to drill 3.0 wells

West Texas - Shallow Howe

§Gross / Net Acres: 2,000 (100% WI)

§County: Ward

§Formation: Yates

§Locations: 40

§D&C: $400K / EUR: 40 MBoe

§2011 Capex / Activity:

§$1.6 MM to drill 4.0 wells

South Texas - Portilla

§Gross / Net Acres: 1,100 (100% WI)

§County: San Patricio

§Formation: Frio 7,400 and 8,100 sands

§Locations: 15

§D&C: $700K - $900K / EUR: 47 - 88 MBoe

§2011 Capex / Activity:

§$7.7 MM to drill 7.0 infill wells

Portilla -

San Patricio County

Spires Ranch -

Nolan County

Shallow Howe -

Ward County

25

Canada Oil Development - Pekisko

§Gross / Net Acres:

§9,120 (100% WI)

§Drilling Inventory:

§10 gross / net locations

§Economics:

§D&C Cost: $2.0 MM

§EUR: 150 MBoe

§Historical Activity:

§2 horizontal wells (2010)

§2011 Activity:

§$4.0 MM to drill 2.0 gross / net
horizontal wells offsetting successful
2010 Twining 9-11 well

§1st well - completed (w/o facilities)

§2nd well - completed (w/o facilities)

§Other:

§Horizontal development of conventional
field

§5,400’ vertical depth / 3,000’ lateral
length

Tomahawk

Twining

Pekisko Trend

Alberta, Canada

26

Southern Alberta Basin - Bakken

§Gross / Net Acres:

§>10,000 net acres

§800 net mineral acres

§Glacier and Toole Counties, Montana

§Leases have 5-10 year primary terms

§2011 Activity:

§Continue to add to leasehold position in
geologically specific areas

§Monitor industry drilling activity

AXAS Leasing Area

Blackfoot Nation Territory

Newfield Wells

Rosetta & Others Wells

Toole

Glacier

Glacier / Toole Counties, Montana

27

Rocky Mountain

Ø8.4 MMBoe of proved reserves

Ø53% proved developed

Ø86% crude oil / NGL

Ø1,004 Boepd of production

Ø20.8 R/P ratio

Ø896 gross (104 net) producing wells

Ø72 PUD locations

Ø81,990 net acres

ØPrimary producing basins include:

§Williston Basin (MT and ND)

§Powder River & Green River Basins (WY)

§Uinta Basin (UT)

ØBakken / Three Forks - HBP

Rocky Mountain

ND

SD

MT

WY

CO

UT

Area of Operations

Overview

Net proved reserves, well count and acreage as of December 31, 2010

Daily net production for the quarter ended June 30, 2011

Alberta Basin

Bakken Play

Bakken / Three Forks

Play

Niobrara Play

28

Permian Basin

Permian Basin

Ø5.6 MMBoe of proved reserves

Ø79% proved developed

Ø31% crude oil / NGL

Ø1,201 Boepd of production

Ø12.3 R/P ratio

Ø210 gross (156 net) producing wells

Ø5 PUD locations

Ø38,951 net acres

ØPrimary producing sub-basins:

§Delaware Basin

§Eastern Shelf

TX

Area of Operations

Overview

Barnett / Woodford

Shale Play

Wolfberry Trend

Net proved reserves, well count and acreage as of December 31, 2010

Daily net production for the quarter ended June 30, 2011

Wolfbone Play

29

Gulf Coast

Gulf Coast

Ø10.9 MMBoe of proved reserves

Ø30% proved developed

Ø17% crude oil / NGL

Ø1,398 Boepd of production

Ø32.0 R/P ratio

Ø53 gross (47 net) producing wells

Ø23 PUD locations

Ø7,776 net acres

ØPrimary producing sub-basin:

§Onshore Gulf Coast

TX

Area of Operations

Overview

Eagle Ford

Shale Play

Net proved reserves, well count and acreage as of December 31, 2010

Net proved reserves, R/P ratio, PUD locations and daily net production include AXAS’ share of Blue Eagle

Daily net production for the quarter ended June 30, 2011

30

NASDAQ: AXAS