This study provides an understanding of the stratigraphy and depositional units of the Manitoba Group and assists in the prediction of the occurrence and distribution of potential hydrocarbon source intervals within this unit in southern Saskatchewan. Several relatively discontinuous potential source rock laminate beds have been recognized within the Manitoba Group. Organic-rich laminations develop at a number of stratigraphic horizons within a variety of depositional lithofacies. Geochemical work has indicated that several regions on the Canadian side of the Williston Basin could have enhanced thermal maturity corresponding to elevated heat anomalies. Consequently, delineation of the distribution of potential source rocks and determination of thermally mature sediments within the Manitoba Group has important implications for prospects within the Devonian section of southern Saskatchewan.
The Middle and Upper Devonian Manitoba Group is composed of a number of shoaling-upward carbonate/evaporite sequences deposited in a shallow epeiric seaway extending throughout the Williston Basin. The Manitoba Group is composed of, in ascending order, the Dawson Bay Formation and the Souris River Formation. The Dawson Bay Formation and Davidson carbonate member of the Souris River Formation resulted from shallow-water carbonate ramp deposition within the study area. The basinal extent of these ramp systems is broadly defined by the development of the Hubbard and Davidson Evaporites that infilled pre-existing basin topography. However, subsequent solution of these evaporitic units inhibits complete reconstruction of the basin geometries. The depositional limit of the evaporite units is considered to be much greater than previously describe in the literature.
The study area is all of southern Saskatchewan, south of Township 40. A total of 70 wells penetrating the Devonian Dawson Bay – Souris River sequence within the study area were selected for use, based upon location, quality of logs, depth of penetration, availability of core, and geographical distribution.
Product – Three Volume Report
- fully illustrated text (39 pages, including 26 colour and B&W figures) documenting stratigraphy, depositional setting & facies, source rock intervals, distribution & maturation, core descriptions, and database;
- 7 regional cross sections;
- 4 isopach maps at 1:500,000 scale;
- 12 stratigraphic picks from Top Souris River Formation to Top Prairie Evaporite Formation;
- 70 well database available in hardcopy and digital formats;
- core descriptions from 30 wells with internally consistent correlations;
- geochemical analyses of 17 samples from 10 wells.
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