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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Vol. 38 (1990), No. 1. (March), Pages 158-158

C.S.P.G. 1990 Convention, "Basin Perspectives"

Sedimentology of Mixed Carbonate-Siliciclastic Deposits: The Permian Belloy Formation of Northeast British Columbia and the Upper Pennsylvanian - Lower Permian Wood River Basin of South-Central Idaho [Abstract]

Burton, B.R.1, Link, P.K.2, Aukes, P.G.3

ABSTRACT

The Upper Pennsylvanian - Lower Permian systems of western North America are characterized by poorly understood mixed carbonate-siliciclastic sedimentary rocks that form important, but under-explored, hydrocarbon sources and reservoirs. Genetic models of mixed carbonate-siliciclastic depositional systems are proposed to assist petroleum exploration.

The Belloy Formation (Wolfcampian-Guadalupian) in the Eagle, West Eagle, and Stoddart areas of northeast British Columbia, produces oil and gas from dolomitic sandstone and coquina reservoirs in tidally influenced west-prograding shoreline sequences. Collapse of the Peace River Arch produced a hinge-zone separating these deposits from thicker, deeper-water, fine grained, mixed carbonate-siliciclastic rocks to the southwest (Belloy Formation and Ishbel Group).

In south-central Idaho, the Wood River Basin (Desmoinesian-Wolfcampian Sun Valley assemblage) provides an excellent model of a tectonically controlled, epicratonic, mixed carbonate-siliciclastic sedimentary basin that formed during late stages of the ancestral Rockies orogeny. Here, carbonate "apron-type" facies are recognized in rocks composed of sub-equal amounts of carbonate and siliciclastic sediment. The Wood River Formation (2000 m) records the evolution of the basin from inner apron facies, where siliciclastic conglomerates intertongue with marginal marine biostromes, through outer apron, fine grained, mixed carbonate-siliciclastic turbidites. The Wood River Basin received carbonate sediment from the east (coeval Snaky Canyon Formation), which mixed in an inner apron environment with sand and silt from another (northern?) source.

Deep-water mixed carbonate-siliciclastic rocks are overlooked by most explorationists because they are usually tight. The Belloy and Wood River formations demonstrate, however, that a genetic relationship between outer and inner shelf/apron deposits can be used to predict the occurrence of reservoir facies.

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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES

1 Norcen Energy Resources Ltd., Calgary T2P 2X7

2 Idaho State University, Idaho 83209

3 Norcen Energy Resources Ltd., Calgary T2P 2X7

Copyright © 2003 by The Society of Canadian Petroleum Geologists. All Rights Reserved.