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The U.S. Geological Survey (USGS) completed a geology-based assessment of continuous (unconventional) tight-gas resources of the Upper Cretaceous Mesaverde Group and Paleogene Wasatch Formation in the Uinta and Piceance Basins of northeast Utah and northwest Colorado (fig. 1). The Mesaverde Total Petroleum System (TPS) produces mostly natural gas from basin-centered accumulations in the two basins. The main sources are primarily coal and carbonaceous shale and siltstone in the Mesaverde Group. This assessment is based on the TPS concept and related geologic criteria and includes information on the hydrocarbon source rocks, reservoir rocks, and hydrocarbon traps. In this study, we defined the Mesaverde TPS and two continuous assessment units (AUs) that have similar structural, stratigraphic, and petroleum-charge histories. The assessment input data for each AU are shown in table 1.

fact sheet

Assessment of undiscovered continuous tight-gas resources in the Mesaverde Group and Wasatch Formation, Uinta-Piceance Province, Utah and Colorado, 2018