GeoDigital Information's Tensleep-Phosphoria study is designed to enhance both exploration and development efforts that are directed at Tensleep and Phosphoria reservoirs. These reservoirs occur within eolian sandstone and peritidal carbonate sequences at multiple stratigraphic horizons. GDI has created an extensive stratigraphic framework that documents the extent of these reservoir-potential intervals. The mapping of these intervals is essential in the exploration for Tensleep and Phosphoria reservoirs.

     The Tensleep-Phosphoria study represents twelve man-years of geologic research which affords explorationists significant time savings in assimilating data and developing exploration strategies. The study area covers 7488 square miles in northeastern Wyoming and southeastern Montana. It spans Big Horn, Washakie, Hot Springs and Park counties in Wyoming and Carbon county in southeastern Montana.

     Correlations of 5,536 wells were made by defining 22 geologic markers throughout the study area. In addition,

porosity limits were defined for all wells with suitable log suites.

     Tensleep and Phosphoria depositional models and lithofacies reservoir potential are determined through the integration of core, thinsection, and log analyses. Four representative field studies are incorporated with a focus on Tensleep and Phosphoria reservoir characteristics, trap types, and deliverability.

     The Tensleep and Phosphoria study contains descriptions of 166 cores. Additionally, more than 550 thinsections were examined to define the diagenetic sequence of events that affect reservoir quality. These core and thinsection descriptions are essential for understanding the geologic history of the Tensleep and Phosphoria in the Bighorn Basin.

     The study components include an extensive summary text and figures, maps and cross sections, core and thinsection descriptions, and stratigraphic data appendices. These components provide the client with a presentation format that is concise and readily useable.