F.A. Stoakes, 1992. "Nature and Succession of Basin Fill Strata", Devonian-Early Mississippian Carbonates of the Western Canada Sedimentary Basin: A Sequence Stratigraphic Framework, Jack Wendte, Frank A. Stoakes, Clarence V. Campbell
Download citation file:
Thick basinal sequences comprising very fine-grained sediments are common in the geological record. For the most part they present a monotonous succession of poorly defined lithologies. Although not the direct focus of exploration efforts these intervals are important in terms of permeability seals and more importantly the accumulation of hydrocarbon source sections.
This article examines the nature and controls on basin filling during the Upper Devonian - Early Mississippian of the WCSB. It focuses primarily on the Ireton and Duvernay intervals of the Woodbend sequence (see Chapter 8). However, conclusions and general inferences are then related to other basin-fill successions, namely the Waterways Formation of the Beaverhill Lake Group (Chapter 7), the Winterburn shales of the Winterburn Group (Chapter 9) and finally the Exshaw - Banff shales of the early Mississippian (Chapter 11).
Volumetrically basin-fill successions comprise a significant portion of the Upper Devonian to Lower Mississippian section in the WCSB. They may be grouped into three types based on gross lithology: 1) Evaporitic 2) Carbonate-rich 3) Shale-rich
Figures & Tables
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.