Laura R.H. Biewick Michael E. Brownfield Lauri Burke Ronald R. Charpentier Russell F. Dubiel Stephanie B. Gaswirth Nicholas J. Gianoutsos Scott A. Kinney Timothy R. Klett Heidi M. Leathers Tracey J. Mercier Stanley T. Paxton Ofori N. Pearson Janet K. Pitman Christopher J. Schenk Marilyn E. Tennyson Katherine J. Whidden Jennifer D. Eoff 2015 <p>Using a geology-based assessment&nbsp;methodology, the U.S. Geological Survey&nbsp;estimated undiscovered mean volumes&nbsp;of 14 million barrels of conventional oil,&nbsp;430 billion cubic feet of conventional gas,&nbsp;34,028 billion cubic feet of continuous gas,&nbsp;and a mean total of 391 million barrels of&nbsp;natural gas liquids in sandstone reservoirs&nbsp;of the Upper Jurassic&ndash;Lower Cretaceous&nbsp;Cotton Valley Group in onshore lands and&nbsp;State waters of the U.S. Gulf Coast region.</p> application/pdf 10.3133/fs20153050 en U.S. Geological Survey Assessment of undiscovered oil and gas resources in sandstone reservoirs of the Cotton Valley Group, U.S. Gulf Coast, 2015 reports