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The Dad Sandstone member of the Upper Cretaceous Lewis Shale, Wyoming, is a lithic-rich fine-grained sandstone and a difficult exploration target. A preliminary analysis of petrophysical, petrological and stratigraphic information was made to determine the major factors that control reservoir quality (porosity and permeability). The data included 718 conventional core plug analyses supplemented with 70 thin sections. The petrophysical data show a wide range of porosity and permeability for individual wells and fields that is not directly related to depth of burial. The sequence of diagenetic events was similar for all the samples studied. The important diagenetic factors include physical compaction, including compaction of ductile grains and framework grains that are altered to clay, calcite and quartz cementation, and late secondary porosity development. Calcite and quartz cement are locally important, but are usually secondary porosity loss mechanisms compared to compaction. Production data from Hay Reservoir show an interesting trend where the majority of petroleum produced is derived from one reservoir interval. This implies a stratigraphic as well as diagenetic control on reservoir quality.
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