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Book Chapter

Woodbend Megasequence

By
F.A. Stoakes
F.A. Stoakes
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Published:
January 01, 1992

Abstract

This sequence comprises the strata between the Beaverhill Lake Group (Chapter 7) and the Winterburn Group (Chapter 9). The stratigraphic section includes shallow-water carbonates of the Cooking Lake, Leduc and Grosmont formations and deep-water carbonates and shales of the Majeau Lake Member, Duvernay and Ireton formations. The isolate reef complexes of the Leduc Formation are especially well known because they contain some of the largest oil reserves in the WCSB. In central Alberta, the basin-fill succession of the Woodbend Group differs markedly from that of the underlying Beaverhill Lake Group. Rather than being comprised dominantly of carbonate muds derived from coeval carbonate banks to the east, Woodbend basin-fill units have a significant clay shale content. The occurrence of these shales marks the initial delivery of terrigenous deposits into the central Alberta Basin from an extrabasinal northerly source. The configuration of these shale "banks" controls the distribution of some overlying carbonate platform deposits.

Figure 1 depicts the configuration of the Alberta Basin during the Woodbend which marks the furthest incursion of the open-marine Devonian seaway onto the craton. Shallow-water platform carbonates occur along the periphery of this basin in east-central Alberta, in the Devonian "Deep Basin" area of west-central Alberta and around the Peace River Arch landmass.

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SEPM Short Course Notes

Devonian-Early Mississippian Carbonates of the Western Canada Sedimentary Basin: A Sequence Stratigraphic Framework

Jack Wendte
Jack Wendte
Institute of Sedimentary and Petroleum Geology, Geological Survey of Canada 3303 33rd Street N.W. Calgary, Alberta T2L 2A7
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Frank A. Stoakes
Frank A. Stoakes
Stoakes Campbell Geoconsulting Ltd. 500, 839 - 5th Avenue S.W. Calgary, Alberta T2P 3C8
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Clarence V. Campbell
Clarence V. Campbell
Stoakes Campbell Geoconsulting Ltd. 500, 839 - 5th Avenue S.W. Calgary, Alberta T2P 3C8
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SEPM Society for Sedimentary Geology
Volume
28
ISBN electronic:
9781565762510
Publication date:
January 01, 1992

GeoRef

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