Stratigraphic partitioning and distribution of reservoir attributes within the Late Devonian Duvernay Formation, Western Canada Sedimentary Basin.

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Abstract

The Late Devonian Duvernay Formation is a nascent shale reservoir within the Western Canada Sedimentary Basin (WCSB) that accumulated as an organic-rich basinal mudrock concurrent with shallow marine carbonates of the Leduc and Grosmont formations. The WCSB is partitioned into the West and East Shale Basins by a narrow, linear Leduc Formation reef complex known as the Rimbey-Meadowbrook trend. Since 2011, Duvernay exploration has been focused in the West Shale Basin. This study characterizes sedimentologic, stratigraphic, and geomechanical controls on Duvernay reservoir potential across the East Shale Basin based upon detailed description of core from 42 wells. Ten basinal Duvernay depositional facies were identified, and nine sequence stratigraphic surfaces were correlated across the study area. Geologic attributes were mapped to identify development “sweet spots” in the East Shale Basin, and hydrocarbon yield calculations indicate a total source rock yield of 5.4 billion barrels of oil within one prospective area.

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Shale. Stratigraphy. Devonian. Duvernay.

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