Assessment of undiscovered oil and gas resources of the Devonian Marcellus Shale of the Appalachian Basin Province

We estimated a mean undiscovered natural gas resource of 84,198 billion cubic feet and a mean undiscovered natural gas liquids resource of 3,379 million barrels using a geology-based assessment methodology.

by Coleman, James L. Jr.; Milici, Robert C.; Cook, Troy A.; Charpentier, Ronald R.; Kirschbaum, Mark A.; Klett, Timothy R.; Pollastro, Richard M.; and Schenk, Christopher J.

U.S. Geological Survey Fact Sheet 2011-3092

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