Legacy Oil Shale Well Logs in Uinta Piceance

This document describes a legacy collection of 2,263 scanned well logs from 621 distinct wells in the Piceance Basin of western Colorado, now made publicly available for long-term preservation. The dataset includes various log types—gamma ray, sonic, neutron, caliper, and lithologic descriptions—with a primary focus on intervals within the Green River Formation, a region notable for its significant oil shale deposits. The logs are provided in PDF and TIFF formats, with file sizes ranging up to 560 megabytes and an average size of 33 megabytes. Image quality varies considerably, reflecting the condition of the original source materials. Due to the departure of key project staff, limited quality assurance and quality control (QA/QC) measures have been performed on this collection. Consequently, several data attributes remain uncertain, including projection details (presumed to be NAD27) and the accuracy of depth measurements and geographic coordinates (latitude and longitude). These uncertainties may pose challenges for some users in applications requiring high precision. Despite these limitations, this collection serves as a valuable resource for geological and petroleum engineering research, offering insights into the subsurface characteristics of the oil shale-rich Green River Formation. Users are encouraged to apply caution and verify data accuracy where critical. The availability of this dataset supports ongoing and future exploration and development activities in the Piceance Basin, providing a foundation for further analysis and preservation of geological information.on of tabular, geospatial and textual information from 3 CD-ROMs published in 1995 and 1996 from the USGS in support of the 1995 National Oil and Gas Assessment Project. This includes USGS DDS Series 30, 35 and 36. This collection was available online through various web platforms hosted by USGS Central Energy Resources Science Center / Central Energy Team since initial recovery from the CD's in early 2000's. This contains the data collection from the original data archives. Over 11,000 files are part of this collection, with 1,524 shapefiles, 648 PDFs and 189 Tab-delimited data files. Limited qa/qc was performed on this due to time constraints and acknowledging that this is a representation of a product over 20 years old.

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