Stratigraphy, sedimentology and petroleum potential of the Upper Devonian Duperow Formation, southwest Manitoba
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Date
2016
Authors
Bates, Kerry
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Abstract
The Upper Devonian (Frasnian) Duperow Formation in the Williston Basin consists of cyclical deposits of carbonate rocks and evaporites deposited in the semi-restricted Duperow Embayment. The formation can be divided, in ascending order, into the Saskatoon, Wymark and Seward members.
Three lithofacies associations (subtidal, intertidal and supratidal/sabkha) comprised of nine lithofacies, representing a semi-restricted interior platform setting, are recognized in this study. These lithofacies include diagenetic features representing alteration in marine, burial and meteoric environments.
Thin organic-rich laminae throughout the Wymark Member have good generative potential for oil and/or gas but are thermally immature. Dolomitized units of the Saskatoon and Wymark Members have good reservoir potential. The best potential for conventional petroleum plays exists in possible structural traps related to salt dissolution in the Prairie Evaporite and block faulting along the Birdtail-Waskada Zone, as well as stratigraphic traps related to laterally and vertically variable dolomitization.
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Geology