2008 Shale Gas Resources
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HORN RIVER BASIN
North American Shale Gas Gas Resource Plays
2008 Shale Gas Resources Frequently Asked Questions
Q. WHAT IS SHALE GAS?
A. Shale gas is natural gas stored in, and produced from shale formations.
Fractured Shale Production Comparisons – TOTAL US
Q. HOW WIDE-SPREAD ARE GAS SHALES?
A. Gas shales occur widely over the United States and Canada.
Q. HOW BIG IS THE RESOURCE?
A. Shale gas is a relatively new gas play. Not all prospective areas have
Technical Issues in Shale Gas Development been assessed fully. Current estimates put the North American shale
gas resource at 1,200 trillion cubic feet total gas in place.
Shale gas will not produce without fractur- Q. WHAT CHARACTERISTICS DOES GAS-BEARING SHALE HAVE?
ing. Initial fracturing is often followed by A. As a gas resource, its most critical characteristics are its very low porosity,
re-fracturing. Best-practice well planning and extremely low permeability. It requires special completions and frac-
now includes provision for multiple fractures turing techniques to bring its production to economic levels.
of horizontally drilled shale gas wells. The
trend in shale gas fracturing has been Q. HOW MUCH OF THE NORTH AMERICAN GAS SUPPLY
towards less expensive, slick water fractur- MIGHT SHALE GAS EVENTUALLY PRODUCE?
WILLISTON BASIN A. Current estimates indicate that shale gas, when fully developed, may
ing with lighter proppants. Care must be
taken, especially in the Barnett Shale, to account for 10% or more of North American gas production.
avoid fracture propagation into water-bear- Fig. 1. – Rigging up for a frac job in the Fayetteville Shale for Southwestern
Energy subsidiary Seeco. At top is one of 22 ponds that Seeco has constructed
ing formations. in the Fayetteville play as sources of frac water. Q. HOW MANY SHALE GAS WELLS ARE THERE IN NORTH AMERICA?
A. There are approximately 40,000 shale gas wells in North America Source: Unconventional Gas — What’s in Play, IHS, Steve Trammel, presented at the third annual
Hart Energy Developing Unconventional Gas Conference, Fort Worth, 2008.
WELL SPACING AND DRILLING FOOTPRINT
Well spacing has consistently diminished in shale gas wells. Spacing of 10 acres or less is not
uncommon. Well density is, therefore, quite high. In addition, shale gas occurs often in urban areas, WINDSOR BASIN
particularly in the Barnett Shale where wells are regularly drilled in dense urban areas around Ft.
Worth, Dallas and their suburbs. This further strength- Horton Bluff
ens the need for a small drilling and production pad
footprint. The solution has been the development of a
new generation of skid land rigs that allow more than BIG
20 horizontal wells to be drilled from one drilling pad.
The skidding flexibility allows rigs such as the
Mowry Participants in shale plays
Helmerich & Payne FlexRig 4, pictured here, to skid Large, Mid and Estimated Net Shale : Basin
over any one of 22 well locations with a spacing MICHIGAN Small Cap Acreage in Barnett/ Barnett/
between wells of 10 ft or less. Closely spaced and par- BASIN UTICA Company Ticker
Gas Shale Plays
Barnett: Fayetteville: Woodford:
Fort Worth Arkoma Arkoma
Woodford: Floyd: New Albany: Haynesville: Muskwa:
Marfa Black Warrior Illinois East Texas Horn River
Abraxas ABP 65 I
allel horizontal wells drilled from these very small pads American Oil & Gas AEZ 90 I
I I I I I
Fig. 2. Helmerich & Payne FlexRig 4 has a hydraulic-ram-type
Anadarko Petroleum APC 400
allow close concentration of bottomhole locations. I
skidding system with two sets of cylinders, two reversible claws,
Apache Corp. APA NA
a hydraulic control console and a 2-by-11 well pattern.
Baxter Bankers Petroleum BNK CN 125 I I
(Image courtesy of Helmerich & Payne) Brigham Exploration BEXP 250 I I
Mancos Cabot Oil & Gas COG NA I I
Carrizo Oil & Gas CRZO 330 I I I I I I
DENVER–JULESBURG ILLINOIS APPALACHIAN BASIN Chesapeake CHK 2,000 I I I I I I I I
PICEANCE BASIN Clayton Williams CWEI NA I
BASIN I I I
UINTA BASIN CNX Gas CXG 786
ConocoPhillips COP 500 I I I
BASIN Contango Oil & Gas MCF NA I
Continental Resources CLR 370 I I I
Cubic Energy QBIK.OB NA I
Denbury Resources DNR NA I I
Devon Energy DVN 1,250 I I I I
Dominion D NA I I
PARADOX Edge Petroleum EPEX 43 I
Pierre Huron El Paso EP NA I I
BASIN Marcellus EnCana ECA 1,200 I I I I I
Hovenweep Energen Corp.
1,500 I I I I I I I I
Equitable Resources EQT NA I I
SAN JOAQUIN EXCO Resources XCO 200 I I I
BASIN SAN JUAN ExxonMobil XOM NA I I I
ARKOMA/ARDMORE BASIN Forest Oil FST 150 I I I I
BASIN Chattanooga Goodrich Petroleum GDP NA I
300 I I
Meridian Resource Corp. TMR NA I
Murphy Oil MUR NA I
SANTA MARIA Newfield Exploration NFX 215 I I
Nexen Inc. NXY NA I
BASIN BLACK WARRIOR Noble Energy NBL 350 I I I I
BASIN Northern Oil & Gas NOGS 8.0 I
Parallel Petroleum PLLL 10 I
Penn Viginia PVA 200 I I I I I I
Petrohawk Energy HK 175 I I
FORT WORTH I I
Map Legend BASIN
Pioneer Natural Res.
NA I I
Plains Exploration PXP NA I I
Questar Corp. STR NA I
DELAWARE BASIN Quicksilver KWK 1,500 I I I I
I I I I I
Haynesville/ Range Resources RRC 1,000
Productive Shale Gas Barnett Bossier
1,500 I I I
St. Mary Land SM 40 I I
Storm Cat SCU 20 I
Prospective Shale Gas Talisman
TXCO Resources TXCO 250 I
Westside Energy WHT 20 I
BLUE Pearsall Whiting Petroleum WLL 150 I
TEXT Basin Name MAVERICK Williams Co WMB 110 I I
BASIN XTO Energy XTO 750 I I I I
RED Atlas Energy ATN 530 I
TEXT Shale Name Breitburn Energy BBEP 530 I
Encore Energy ENP NA I I
Linn Energy LINE NA I I
Source: John White, Natixis Bleichroeder Inc., Shale Plays Soar, An Investor’s Guide to Unconventional Gas: Shales and Coalbed Methane, Oil & Gas Investor, January 2008. Revised by Hart Energy Publishing, May 2008.
This map is based on the best available information regarding location and extent of shale gas plays in North America.
Hart Energy Publishing does not warrant this information as being a definitive map of shale gas plays in North America. This map is
not to be used for exploration, investment, navigation, or other purposes where precise geographic coordinates are required.
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