Tracey J. Mercier Sarah E. Gelman Christopher J. Schenk Cheryl A. Woodall Andrea D. Cicero Ronald M. Drake II Geoffrey S. Ellis Thomas M. Finn Michael H. Gardner Jane S. Hearon Benjamin G. Johnson Jenny H. Lagesse Phuong A. Le Heidi M. Leathers-Miller Kira K. Timm Scott S. Young Kristen R. Marra 2021 <p>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 trillion cubic feet of gas (associated) in the Bakken and Three Forks Formations of the Williston Basin Province, North Dakota and Montana.</p> application/pdf 10.3133/fs20213058 en U.S. Geological Survey Assessment of undiscovered continuous oil resources in the Bakken and Three Forks Formations of the Williston Basin Province, North Dakota and Montana, 2021 reports