National Assessment of Oil and Gas Project:

Petroleum Systems and Geologic Assessment of Oil and Gas in the Bighorn Basin Province, Wyoming and Montana

U.S. Geological Survey Bighorn Basin Assessment Team

Available on CD-ROM contact  Energy Team CD Distribution

Contents

• ReadMeFile (442 kB)

• Chapter 1 (1.8 MB)
  Executive Summary—Assessment of Undiscovered Oil and Gas Resources of the Bighorn Basin Province, Wyoming and Montana, 2008
  By USGS Bighorn Basin Province Assessment Team

• Chapter 2 (561 kB)
  Tabular Data and Graphical Images in Support of the U.S. Geological Survey National Oil and Gas Assessment— Bighorn Basin Province (5034)
  By T.R. Klett and P.A. Le

• Chapter 3 (14.1 MB)
  Cretaceous–Tertiary Composite Total Petroleum System (503402), Bighorn Basin, Wyoming and Montana
  By Thomas M. Finn, Mark A. Kirschbaum, Stephen B. Roberts, Steven M. Condon, Laura N.R. Roberts, and Ronald C. Johnson

• Chapter 4 (3 MB)
  New Source Rock Data for the Thermopolis and Mowry Shales in the Wyoming Part of the Bighorn Basin
  By Thomas M. Finn

• Chapter 5 (4.5 MB)
  Sonic Velocity and Other Petrophysical Properties of Source Rocks of Cody, Mowry, Shell Creek, and Thermopolis Shales, Bighorn Basin, Wyoming
  By Philip H. Nelson

• Chapter 6 (1.2 MB)
  Subsurface Stratigraphic Cross Sections Showing Correlation of Cretaceous and Lower Tertiary Rocks in the Bighorn Basin, Wyoming and Montana
  By Thomas M. Finn

• Chapter 7 (528 kB)
  Detailed West to East Cross Section of Cretaceous and Lower Tertiary Rocks Across the South Part of the Bighorn Basin, Wyoming
  By Ronald C. Johnson

• Chapter 8 (733 kB)
  The GIS Project for the Geologic Assessment of Undiscovered Oil and Gas Resources of the Bighorn Basin Province, Wyoming and Montana
  By GIS Spatial Data Team

GIS/Data/Metadata

• Boundary
• Cloverly Formation
• Assessment Units and Input Data Form
• Total Petroleum Systems
• Quarter-Mile Cells
• Assessment Units

Abstract The U.S. Geological Survey (USGS) recently completed an assessment of the undiscovered oil and gas potential of the Bighorn Basin Province, which encompasses about 6.7 million acres in north-central Wyoming and southern Montana. The assessment is based on the geologic elements of each total petroleum system defined in the province, including petroleum source rocks (source-rock maturation, petroleum generation, and migration), reservoir rocks (sequence stratigraphy and petrophysical properties), and traps (trap formation and timing). Using this geologic framework, the USGS defined two total petroleum systems: (1) Phosphoria, and (2) Cretaceous–Tertiary Composite. Within these two systems, eight assessment units (AU) were defined, and undiscovered oil and gas resources were quantitatively estimated within each AU.