Assessment of undiscovered oil and gas resources in the Paradox Basin Province, Utah, Colorado, New Mexico, and Arizona, 2011

http://pubs.usgs.gov/fs/2012/3031/

We estimated means of 560 million barrels of undiscovered oil, 12,701 billion cubic feet of undiscovered natural gas, and 490 million barrels of undiscovered natural gas liquids in this area using a geology-based assessment methodology.

by Whidden, Katherine J.; Anna, Lawrence O.; Pearson, Krystal M.; and Lillis, Paul G.

U.S. Geological Survey Fact Sheet 2012-3031