Exploration in the Minnelusa Sandstone using a digital well log database
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The Pennsylvanian Minnelusa Sandstone is one of the most prolific oil producing formations in the Powder River Basin of Wyoming. Virtually all petroleum accumulation is in stratigraphic traps, with much production from paleotopographic highs beneath a regional unconformity. Oil is trapped in dune sands. Both thickness of sandstones and their cementation vary greatly over short distances. The exploration area comprises 60 townships and 3400 wells. About 95% of the wells have sonic γ ray logs. The database includes cartographic data, formation, and zone tops picked by a single geologist, and normalized γ ray and sonic logs. Great emphasis is placed on data quality. Newly released logs are added monthly. This database provides the exploration geologist with a new way of doing subsurface interpretation. Free from demands of gathering and tabulating basic data, the geologist is able to do more creative work. A new and original concept—one that would take several person-months of manual effort to work out—can be mapped out and evaluated in less than a week.
KeywordsMinnelusa digital well log database
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