Thomas S. Ahlbrandt Ronald R. Charpentier Donald L. Gautier Timothy R. Klett Richard M. Pollastro Christopher J. Schenk Gregory F. Ulmishek Mitchell E. Henry 2006 Using a geology-based assessment methodology, the U.S. Geological Survey estimated a mean of 40 trillion cubic feet of undiscovered nonassociated gas, a mean of 10.5 billion barrels of undiscovered oil (with 46.6 trillion cubic feet of associated gas), and a mean of 4.0 billion barrels of undiscovered natural gas liquids in the Mackenzie Delta Province of North America, exclusive of the unassessed deep-water portion of the province. application/pdf 10.3133/fs20063002 en U.S. Geological Survey Assessment of undiscovered oil and gas resources of the Mackenzie Delta province, North America, 2004 reports