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Digital Data Series 69-Y

National Assessment of Oil and Gas Project:

Oil Shale and Nahcolite Resources of the Piceance Basin, Colorado

U.S. Geological Survey Oil Shale Assessment Team

Available on CD-ROM contact  Energy Team CD Distribution



View the Report in CD-ROM structure (1.1 MB)
Cover and link to pdf report


This report presents an in-place assessment of the oil shale and nahcolite resources of the Green River Formation in the Piceance Basin of western Colorado. The Piceance Basin is one of three large structural and sedimentary basins that contain vast amounts of oil shale resources in the Green River Formation of Eocene age. The other two basins, the Uinta Basin of eastern Utah and westernmost Colorado, and the Greater Green River Basin of southwest Wyoming, northwestern Colorado, and northeastern Utah also contain large resources of oil shale in the Green River Formation, and these two basins will be assessed separately.

Estimated in-place oil is about 1.5 trillion barrels, based on Fischer a ssay results from boreholes drilled to evaluate oil shale, making it the largest oil shale deposit in the world. The estimated in-place nahcolite resource is about 43.3 billion short tons.

Suggested citation:

U.S. Geological Survey Oil Shale Assessment Team, 2010, Oil shale and nahcolite resources of the Piceance Basin, Colorado: U.S. Geological Survey Digital Data Series DDS–69–Y, 7 chapters, pages variable.

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