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Recent studies indicate that the Piceance Basin in northwestern Colorado contains over 1.5 trillion barrels of oil in place, making the basin the largest known oil-shale deposit in the world. Previously published histograms display oil-yield variations with depth and widely correlate rich and lean oil-shale beds and zones throughout the basin. Histograms in this report display oil-yield data plotted alongside either water-yield or oil specific-gravity data. Fischer assay analyses of core and cutting samples collected from exploration drill holes penetrating the Eocene Green River Formation in the Piceance Basin can aid in determining the origins of those deposits, as well as estimating the amount of organic matter, halite, nahcolite, and water-bearing minerals. This report focuses only on the oil yield plotted against water yield and oil specific gravity. Introduction The Green River Formation in the Piceance Basin of northwestern Colorado (fig. 1) was deposited in Lake Uinta during early to middle Eocene time, with the richest oil-shale deposits (Johnson and others, 2010) in the Garden Gulch and Parachute Creek Members (fig. 2). From this area, rich in oil shale, data were collected and preserved for use by researchers and industry in anticipation of a time when Green River oil-shale deposits would become an economically practical alternate source of fossil energy. For several decades, the U.S. Geological Survey (USGS) has collected core, cuttings and other subsurface data from boreholes drilled to evaluate these oil-shale deposits (Smith and others, 1972; Beard and others, 1974; Brownfield and others, 2010). Types of collected data include (1) Fischer (shale oil) assay analyses (American Society for Testing and Materials [ASTM], 1984) on cores and cuttings from rotary-drilled holes; (2) geophysical and lithologic logs of drill holes; (3) chemical, water-quality, and X-ray diffraction analyses; as well as (4) rock-mechanics data. Dyni (1998), in cooperation with the U.S. Department of Energy, published original Fischer assay data on 737 oil-shale exploration holes, containing about 298,500 assays in text format. Most of the Fischer assays on oil-shale samples were conducted by the U.S. Bureau of Mines (USBM) laboratory in Laramie, Wyoming. From the late 1940s to the early 1980s, the USBM analyzed core splits and drill cuttings from holes drilled in the Green River Formation oil-shale deposits in Colorado, Utah, and Wyoming; holes

u.s. geological survey open file report/open-file report

Histograms showing variations in oil yield, water yield, and specific gravity of oil from Fischer assay analyses of oil-shale drill cores and cuttings from the Piceance Basin, northwestern Colorado