Marcellus Shale - Appalachian Basin Natural Gas Play

Early Marcellus Estimates by USGS

As recently as 2002 the United States Geological Survey in its Assessment of Undiscovered Oil and Gas Resources of the Appalachian Basin Province, calculated that the Marcellus Shale contained an estimated undiscovered resource of about 1.9 trillion cubic feet of gas. [1] That's a lot of gas but spread over the enormous geographic extent of the Marcellus it was not that much per acre.