Janet K. Pitman Ofori N. Pearson Peter D. Warwick Alexander W. Karlsen James L. Coleman Jr. Paul C. Hackley Daniel O. Hayba Sharon M. Swanson Ronald R. Charpentier Troy A Cook Timothy R. Klett Richard M. Pollastro Christopher J. Schenk Russell F. Dubiel 2007 <p class="abstract">Using a geology-based assessment methodology, the U.S. Geological Survey estimated a mean of 113.7 trillion cubic feet of undiscovered natural gas, a mean of 690 million barrels of undiscovered oil, and a mean of 3.7 billion barrels of undiscovered natural gas liquids in onshore lands and State waters of the Gulf Coast.</p> application/pdf 10.3133/fs20073066 en U.S. Geological Survey Assessment of undiscovered oil and gas resources in Tertiary strata of the Gulf Coast, 2007 reports