High resolution sequence stratigraphy and a study of reservoir controls of the glauconitic sandstone member in the Cessford Mannville C Pool, southeastern Alberta

The Glauconitic sandstone member of the Mannville Group in the Cessford area of southeastern Alberta was deposited in an estuarine environment and is comprised of three depositional sequences. Initial deposition of DS1 occurred in a planiform funnel-shaped valley, which was eroded into the underlying Mississippian deposits during the pre-Cretaceous hiatus. The main body of each depositional sequence is composed of sandstones deposited in estuarine channel and bay-head delta environments. A paleosol or coal, indicating a period of subaerial exposure, marks the top of each depositional sequence.; Several factors affect the porosity and permeability of the sandstones, including grain size, sedimentary structure, the presence of kaolinite, and mineralogy. Grain size has the strongest influence, followed by mineralogy and sedimentary structure. Production from the Mannville C Pool is controlled by a combination of structure and facies. The best producers are structurally high, allowing the more permeable sandstones and conglomerates of DS1 and DS2 to intersect the oil interval.