Jason A. Flaum Justin E. Birdwell Scott A. Kinney Janet K. Pitman Stanley T. Paxton Katherine L. French Tracey J. Mercier Heidi M. Leathers-Miller Christopher J. Schenk Rand Gardner 2025 <p>Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 152 million barrels of oil and 47.9 trillion cubic feet of gas in reservoirs of the Haynesville Formation within the onshore United States and State waters of the Gulf Coast Basin.</p> application/pdf 10.3133/fs20253054 en U.S. Geological Survey Assessment of undiscovered oil and gas resources in the Haynesville Formation within the onshore United States and State waters of the Gulf Coast Basin, 2024 reports