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Open-File Report 98-483

Prepared in cooperation with the U.S. Department of Energy

Fischer Assays of Oil Shale Drill Cores and Rotary Cuttings from the Piceance Basin, Colorado—2009 Update

By Tracey J. Mercier, Michael E. Brownfield, Ronald C. Johnson, and Jesse G. Self


Thumbnail of cover and link to report PDF (16.9 MB)

This CD–ROM includes updated files containing Fischer assays of samples of core holes and cuttings from exploration drill holes drilled in the Eocene Green River Formation in the Piceance Basin of northwestern Colorado. A database was compiled that includes more than 321,380 Fischer assays from 782 boreholes. Most of the oil yield data were analyzed by the former U.S. Bureau of Mines oil shale laboratory in Laramie, Wyoming, and some analyses were made by private laboratories. Location data for 1,042 core and rotary holes, oil and gas tests, as well as a few surface sections are listed in a spreadsheet and included in the CD–ROM.

These assays are part of a larger collection of subsurface information held by the U.S. Geological Survey, including geophysical and lithologic logs, water data, and chemical and X-ray diffraction analyses having to do with the Green River oil shale deposits in Colorado, Wyoming, and Utah. Because of an increased interest in oil shale, this CD–ROM disc containing updated Fischer assay data for the Piceance Basin oil shale deposits in northwestern Colorado is being released to the public.

Version 2.0

First posted October 21, 2009

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

U.S. Geological Survey Oil Shale Assessment Team, 2009, Fischer assays of oil shale drill cores and rotary cuttings from the Piceance Basin, Colorado–2009 Update: U.S. Geological Survey Open-File Report 98–483 Version 2.0, 16 p.


Introduction 2009 Update

2009 CD–ROM

Readme File for the U.S. Geological Survey Open–File Report 98–483

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