Sarah E. Gelman Jane S. Hearon Tracey J. Mercier Phuong A. Le Andrea D. Cicero Benjamin G. Johnson Jenny H. Lagesse Heidi M. Leathers-Miller Christopher J. Schenk 2026 <p class="MsoNormal">Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 10.4 billion barrels of oil and 53.3 trillion cubic feet of gas in the Santos Basin, Campos Basin, and Espírito Santo Basin provinces of Brazil.</p> application/pdf 10.3133/fs20263062 en U.S. Geological Survey Assessment of undiscovered conventional oil and gas resources in the Santos Basin, Campos Basin, and Espírito Santo Basin provinces of Brazil, 2024 reports