ABSTRACT

The Nisku, Leduc and Basal Quartz are the producing zones in the West Drumheller and Drumheller oil fields, which were discovered between 1950 and 1952. The Nisku formation of the Upper Devonian is the primary reservoir. Production is also obtained from the Leduc reef at West Drumheller, and from the Lower Cretaceous Basal Quartz sandstone in Drumheller. The Nisku consists of two units: an upper unit of dense, evaporitic dolomite and anhydrite, and a lower unit of porous crystalline dolomite, which is the reservoir rock. The trap at West Drumheller is due to reef buildup; at Drumheller it is stratigraphic. Reservoir and development data are presented in the text.

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