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Abstracts 4. Lateral Facies Relationships and Reservoir Geometry in the Mississippian MC-3 (Frobisher-Alida Beds) of the Pierson Field, Northeastern Williston Basin
Supervisor: Dr. J. Hopkins
The Pierson oil field is located in the extreme southwestern part of Manitoba on the northeastern side of the Williston Basin. Here the interbedded porous and non-porous, in places anhydritic carbonates of the Mississippian MC-3 member dip gently to the southwest and are truncated by non-porous beds of the Jurassic Amaranth Formation. The oil is trapped near the subcrop edge against an anhydritic caprock which directly underlies the pre-Jurassic unconformity. The caprock is a diagenetically altered zone and its formation is believed to be related to the pre-Jurassic erosional event.
The distribution of the porosity in the oil field is in part related to the original sedimentary framework of the MC-3 member. Thus a subdivision in 9 facies units is proposed. Facies unit 1 occurs locally in the basal part of the member. It is a transgressive lag deposit. Facies units 2, 3 and subfacies unit 4a together form the lower part of the member and represent a shallowing upward sequence of carbonate mudstones. Subfacies unit 4b and facies units 5 and 6 form two buildups and are the principal reservoir rocks. Facies units 7, 8 and 9 are discontinuous, wedge like deposits adjacent to the carbonate buildups. They represent washover fans and tidal channel fills.
Acknowledgments and Associated Footnotes
1 University of Calgary, M.Sc. Thesis Research
Copyright © 2010 by the Canadian Society of Petroleum Geologists
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