USGS – American Oil Reserves

https://www.usgs.gov/centers/central-energy-resources-science-center/science/united-states-assessments-undiscovered-oil https://www.usgs.gov/centers/central-energy-resources-science-center/science/williston-basin-oil-and-gas-assessments Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 4.3 billion barrels of oil and 4.9