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Recent oil and gas discoveries in the Upper Devonian (Fammenian) Wabamun Group of the Peace River arch area, north-central Alberta, have led to a reevaluation of stratigraphic and structural trapping mechanisms. These discoveries have occurred at a number of different intervals within the Wabamun. In the Tangent, Teepee, and Eaglesham areas, fractured and dolomitized mudstones, and grainstones produce hydrocarbons. At Normandville, however, fractured stromatoporoid-algal boundstones form the reservoir. Stromatoporoid-algal boundstones in the Wabamun Group have not been reported previously in this area. The stromatoporoids consist of predominantly massive and bulbous growth forms that created shoals and mounds in the Wabamun epeiric sea. Encrusting algae constitute an addi ional major component of the boundstone. Sparry-calcite cemented pelletal, skeletal, and oolitic grainstones form the surrounding matrix.
Although Wabamun carbonates are predominantly well-cemented mudstones and grainstones, the reemergence of relatively primitive stromatoporoid forms in the Late Devonian, after the extinction of the numerous Frasnian stromatoporoid families, provides potential for an interesting new exploration target.
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