This regional framework study examines the stratigraphy and depositional facies of the Jean Marie Member and relates the extent of its fracturing system to reservoir quality and deliverability. The Jean Marie Member lies conformably above the shales of the Fort Simpson Formation and is, in turn, conformably overlain by Redknife shale. Observations in this study indicate that it comprises a tripartite stratigraphy consisting of a rather monotonous, relatively flat-lying basal ramp, a “lower” Jean Marie unit and an “upper” Jean Marie unit.
The Jean Marie Member is primarily comprised of limestones, however dolostone does occurs in the “upper” Jean Marie where it is commonly porous. The Jean Marie Member can be divided into six distinct depositional facies
- open marine
- open marine dominated by wafer stromatoporoids
- open marine with abundant corals
- ‘monkey-plate’ stromatoporoid-Renalcis reef core
- grainy/muddy foreslope
- Amphipora meadow
The study focuses on several areas in north eastern British Columbia: Ekwan (94-I-10), Gunnell (94-I-13), Tees (94-I-16), Helmet (94-P-7), Peggo (94-P-8) and July Lake (94-P-10 & 94-P-15). A total of 58 cored intervals from 52 wells were described at the British Columbia Core Repository in Charlie Lake, B.C., for this study.
- text and figures (16 pages including core photos and figures) documenting stratigraphy, depositional facies, fracturing, dolomitization and exploration potential of the Jean Marie;
- 3 maps, isopach of Jean Marie, isopach of “Lower” Jean Marie, isopach of “Upper” Jean Marie;
- core descriptions from 52 wells with internally consistent correlations and annotated facies units.
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