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The in-place oil shale resources in the Eocene Green River Formation of the Piceance Basin of western Colorado and the Uinta Basin of western Colorado and eastern Utah are estimated at 1.53 trillion barrels and 1.32 trillion barrels, respectively. The oil shale strata were deposited in a single large saline lake, Lake Uinta, that covered both basins and the intervening Douglas Creek arch, an area of comparatively low rates of subsidence throughout the history of Lake Uinta. Although the Green River Formation is largely eroded for about a 20-mile area along the crest of the arch, the oil shale interval is similar in both basins, and 17 out of 18 of the assessed oil shale zones are common to both basins. Assessment maps for these 17 zones are combined so that the overall distribution of oil shale over the entire extent of Lake Uinta can be studied. The combined maps show that throughout most of the history of Lake Uinta, the richest oil shale was deposited in the depocenter in the north-central part of the Piceance Basin and in the northeast corner of the Uinta Basin where it is closest to the Piceance Basin, which is the only area of the Uinta Basin where all of the rich and lean oil shale zones, originally defined in the Piceance Basin, can be identified. Both the oil shale and saline mineral depocenter in the Piceance Basin and the richest oil shale area in the Uinta Basin were in areas with comparatively low rates of subsidence during Lake Uinta time, but both areas had low rates of clastic influx. Limiting clastic influx rather than maximizing subsidence appears to have been the most important factor in producing rich oil shale. Introduction The in-place oil shale resources in the Eocene Green River Formation of the Piceance Basin of western Colorado and the Uinta Basin of western Colorado and eastern Utah are estimated at 1.53 trillion barrels and 1.32 trillion barrels, respectively (Johnson, Mercier, Brownfield, and others, 2010; Johnson, Mercier, Brownfield, and Self, 2010). The oil shale strata were deposited in a single large saline lake, Lake Uinta, that covered both basins and the intervening Douglas Creek arch (figs. 1 and 2). Although the Green River Formation is largely eroded for about a 20-mile area along the crest of the arch, the oil shale interval is similar in both basins, and 17 of the 18 assessed oil shale zones are common to both basins. The Greater Green River Basin of Wyoming, Utah, and Colorado also contains significant oil shale resources in the Green River Formation, recently estimated at 1.44 trillion barrels of oil in place (Johnson and others, 2011); however, these oil shale resources were deposited in a separate Eocene lake, Lake Gosiute, that underwent a different depositional history from that of Lake Uinta. There has been little success thus far correlating the oil shale deposits of Lake Gosiute to those of Lake Uinta; therefore, the oil shale deposits of Lake Gosiute are excluded from this report. The oil shale interval in the Uinta and Piceance Basins is divided into 18 rich and lean zones (fig. 3), 17 of which are recognized in both basins, and one zone, bed 76, is unique to the Uinta Basin. Four maps are presented here for each assessed zone: (1) isopach, (2) variations in gallons per ton (GPT), (3) variations in barrels per acre (BPA) oil yield, and (4) total in-place oil in each 6-mi by 6-mi township. Gallons per ton maps depict variations in the richness of oil shale deposited in a particular oil shale zone, whereas BPA maps depict variations in the total amount of oil. In this report, the individual assessment results for the Uinta and Piceance Basins are combined into a single set of maps for the 17 oil shale zones common to both basins. The maps are identical to those published by Johnson, Mercier, Brownfield, and others (2010) and Johnson, Mercier, Brownfield, and Self (2010), except the contoured intervals are changed so that both basins use the same intervals for each map. Some detail on a few of the Uinta Basin maps originally published by Johnson, Mercier, Brownfield, and Self (2010) is lost due to the new contour intervals. Combined maps depicting total oil in each township were considered of limited usefulness and are not presented here. Maps showing variations in weight-percent oil for each zone are presented for the first time. This step was taken because weight-percent oil is used instead of GPT to measure variations in oil shale richness by most countries; thus, these Isopach and Isoresource Maps for Oil Shale Deposits in the Eocene Green River Formation for the Combined Uinta and Piceance Basins, Utah and Colorado By Tracey J. Mercier and Ronald C. Johnson 2 M ps or O il Sale D eosits in U nta nd Piance B ains, U ah nd Coorado Figure 1. Generalized geologic map of the Uinta and Piceance Basins, northeastern Utah and northwestern Colorado, showing Upper Cretaceous and lower Tertiary stratigraphic units. Glenwood Springs CARBON

Isopach and isoresource maps for oil shale deposits in the Eocene Green River Formation for the combined Uinta and Piceance Basins, Utah and Colorado