J.C. Wendte, 1992. "Evolution of the Judy Creek Complex, a Late Middle Devonian Isolate Platform–Reef Complex in West–Central Alberta", Devonian-Early Mississippian Carbonates of the Western Canada Sedimentary Basin: A Sequence Stratigraphic Framework, Jack Wendte, Frank A. Stoakes, Clarence V. Campbell
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Reef complexes situated on carbonate platforms contain a disproportionate amount of hydrocarbon reserves. In Western Canada, approximately half of the oil and gas pools with recoverable reserves greater than 16 X 106 m3 (100 million barrels) of oil or its gas equivalent are Devonian reef complexes. Cores and wireline logs from producing and outlying wells from these pools provide perhaps an unparalleled opportunity to examine the evolution of reef complexes in all three dimensions.
Most of the hydrocarbon bearing Devonian reef complexes in the WCSB are isolate features situated on areally widespread carbonate platforms. They include the Middle Devonian (late Givetian) Swan Hills reef complexes in west-central Alberta and the Kee Scarp buildup at Norman Wells in the Northwest Territories; and the Late Devonian (Frasnian) Leduc reef complexes in both east-central and west-central Alberta. The previous chapter dealt with the evolution of the underlying carbonate platform and its relationship to reef inception and localization. This chapter focuses primarily on the evolution of isolate platform-reef complexes. The Swan Hills buildup at Judy Creek in west-central Alberta is used as an example to illustrate the evolutionary development of these complexes.
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Devonian-Early Mississippian Carbonates of the Western Canada Sedimentary Basin: A Sequence Stratigraphic Framework
The Devonian and early Mississippian strata in the Western Canada Sedimentary Basin include a wide diversity of shallow-water carbonate and basin filling carbonate, shale and evaporite facies. Of these, the large Devonian platform-reef complexes are the most spectacular. They occur in magnificent exposures in the Front Ranges of the Canadian Rockies and in the subsurface of Alberta. In the subsurface, these complexes pool many of the largest oil and gas accumulations in Western Canada. This short course is intended to provide a summary of Devonian and early Mississippian deposits in the subsurface of the Western Canada Sedimentary Basin. One of the major goals is to present the evolution of these strata in a sequence-stratigraphic context. The role of sea-level, tectonic and depositional controls on “stacking” and facies patterns are considered. A second major goal is to relate the occurrence of hydrocarbon pools to this sequence-stratigraphic framework.