Tracey J. Mercier Phuong A. Le Andrea D. Cicero Ronald M. Drake II Sarah E. Gelman Jane S. Hearon Benjamin G. Johnson Jenny H. Lagesse Heidi M. Leathers-Miller Kira K. Timm Christopher J. Schenk 2025 <p>Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 1.0 billion barrels of oil and 53.4 trillion cubic feet of gas in India and Sri Lanka.</p> application/pdf 10.3133/fs20253043 en U.S. Geological Survey Assessment of undiscovered conventional oil and gas resources of India and Sri Lanka, 2024 reports