Sustaining Members

Williams

Questar Market Resources

Pioneer Natural Resources

Halliburton Energy Services
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EnCana Oil and Gas (USA) Inc.

Devon Energy Corporation

Bill Barrett Corporation

Anadarko Petroleum

Noble Energy Inc.
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SM Energy

Black Gold Members

Sanjel
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XTO Energy Inc.

Wells Fargo Bank, N.A.

Merit Energy Company
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IMA

Fidelity Exploration and Production Company

EOG Resources

Enerplus Resources (USA) Corporation

El Paso Western Pipelines

Cabot Oil & Gas Corporation

Whiting Petroleum Corporation

Ultra Petroleum, Inc.

Samson Resources

Newfield Exploration Company
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Ensign United States Drilling

Cordillera Energy Partners III, LLC

Black Hills Exploration and Production, Inc.

Berry Petroleum Company

Merit Energy Company
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Wildcatter Members

Baker Hughes Inc.
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Robert L. Bayless, Producer LLC
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Petroleum Development Corporation
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Petroglyph Energy, Inc.
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Nerd Gas Company, LLC
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Nabors Drilling USA, LP
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McElvain Oil and Gas Properties
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Marathon Oil Company

Lario Oil and Gas Company
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Forest Oil Corporation

Ernst and Young

Cimarex Energy Co.

Chesapeake Energy Corporation

Cameron

Calfrac Well Services Corp

BP America

U.S. Bank

Schlumberger

Saga Petroleum

Oneok Field Services Company

Rosetta Resources Inc.

Tudor Pickering Holt and Co

Weatherford International

EnCap Investments

El Paso E and P Company, L.P.

BOPCO, L.P.

Basic Energy Services