ABSTRACT

The East Calgary gas field in southern Alberta is located at the junction of two trends of stratigraphic traps. The lower reservoir, the Crossfield dolomite member of the Upper Devonian Three Forks formation, contains substantial reserves of highly sulphurous gas trapped by an eastward up-dip porosity pinch-out. The upper reservoir, the Elkton member of the Mississippian Turner Valley formation, contains sizeable wet-gas reserves within a lobe of porous dolomite formed by progressive eastward erosional truncation of the Mississippian surface. Minor gas reserves may be present within Basal Cretaceous sands lying immediately above the Mississippian unconformity. Step-outs and infill drilling is continuing slowly within the field area of approximately two townships.

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