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The AAPG/Datapages Combined Publications Database
Williston Basin Symposium
Abstract
SKGS-AAPG
Sixth International Williston Basin Symposium, October 7,
MINTON POOL, SOUTH-CENTRAL SASKATCHEWAN: A MODEL FOR BASEMENT INDUCED STRUCTURAL AND STRATIGRAPHIC RELATIONSHIPS
ABSTRACT
In the Minton pool, south-central Saskatchewan, oil is trapped in structural closures in the Ordovician Red River and Devonian Winnipegosis Formation. The Minton pool marks the most northern accumulation of oil in Red River dolomites along a major oil production fairway that extends 200 km (120 miles) south into Richland County, Montana.
Development of structural closure is related to conjugate wrench faults along zones of weakness in Precambrian basement rocks. Growth of structural closures is best expressed by thinning of Silurian age strata. Upper Devonian and lower Mississippian age basement faulting is recognized along the margins of the structural closures. Porosity in both the Red River and Winnipegosis dolomites is best developed within structural closures and is commonly enhanced by fracture porosity. Likewise, porous coral-stromatoporoid bank reservoir facies of the Winnipegosis Formation crown the structural crest thereby suggesting depositional control.
Timing of structural growth, oil reserves, oil source rocks and dolomite reservoir characteristics of the Minton pool are similar to those in the well-established production trend to the south in eastern Montana. Significant exploration potential is indicated in southern Saskatchewan to at least the limits of Red River source rock maturations.
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