Christopher J. Schenk Jenny H. Lagesse Benjamin G. Johnson Tracey J. Mercier Heidi M. Leathers-Miller Sarah E. Gelman Jane S. Hearon Phuong A. Le Andrea D. Cicero 2026 <p class="MsoNormal">Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean continuous and conventional resources of 1.6 billion barrels of oil and 28.3 trillion cubic feet of gas in the Woodford and Barnett Shales of the Permian Basin Province.</p> application/pdf 10.3133/fs20263059 en U.S. Geological Survey Assessment of undiscovered continuous and conventional oil and gas resources in the Woodford and Barnett Shales of the Permian Basin Province, Texas and New Mexico, 2025 reports