Sequence stratigraphic and depositional controls on reservoir continuity within the Cretaceous Doe Creek Member of the Kaskapau Formation, Valhalla Field, Alberta, Canada.

The Doe Creek Member of the Late Cretaceous (Cenomanian) Kaskapau Formation is located in northwestern Alberta. Valhalla Field was discovered in 1979 and is the major producer of hydrocarbons from the Doe Creek Member. This study assesses the spatial and temporal distribution of reservoir facies by evaluating the sequence stratigraphic controls on reservoir quality and continuity across Valhalla Field. A total of ten retrogradationally-stacked parasequences and/or associated bedsets occur within the Doe Creek Member, of which, four include reservoir quality sandstone (I-1, I-Sand, I+1 and I+2). For these sandstones, maps are provided that depict the spatial distribution of reservoir facies, average effective porosity, gross pore volume and fraction of calcite cement. Comparison of these maps with fieldwide trends of total fluid and cumulative oil production suggest a strong correlation, and validate the utility of the sequence-keyed stratigraphic framework presented in this study as a guide for enhanced oil recovery.