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An assessment of oil and gas resources of the United States was completed by the United States Geological Survey (USGS) in 1994 and published in 1995 (U.S. Geological Survey National Oil and Gas Resource Assessment Team, 1995; Gautier and others, 1995; Dolton, 1995). As part of this assessment and for the first time, the USGS assessed recoverable resources from unconventional or continuous-type deposits nationally. These deposits, commonly treated as unconventional, have an important place in the nation’s energy future. At the same time, they possess unique geologic, technologic and economic aspects which set them apart from conventional types of oil and gas resources. The purpose of this report is to lay out the assumptions and results of the initial resource assessment of the Antrim Shale, and indicate directions of research to improve future assessments.

An initial resource assessment of the Upper Devonian Antrim Shale in the Michigan basin