This study a northerly extension of the regional Shunda Regional Subcrop study previously completed by SCG. The study subdivides the Shunda Formation into a number of correlatable cycles and facies developments that high-grades portions of the regional subcrop for subsequent reservoir development.
The Shunda Formation can be broadly separated into 3 depositional units (S1, S2 and S3) based in large part on log signature. Shunda unit S1 is primarily an argillaceous unit deposited under distal ramp conditions and as such displays little or no reservoir quality. Shunda unit S2 shows a characteristic “marine” shoaling profile on logs. The cleaner proximal ramp is dolomitized and develops porosity in proximity to its subcrop. Shunda unit S3 comprises two divisions based on log signature (S3A and S3B). The uppermost carbonate interval of S3A is of particular interest and an isopach of this carbonate interval suggests it constitutes a ramp cycle that passes from inboard ramp through proximal ramp and northwards into its equivalent distal ramp. Its subcrop edge is topsealed everywhere by either Nordegg or Cretaceous sediments and has not been systematically exploited. Shunda unit S3B marks a renewed transgression and is comprised predominantly of open marine distal ramp sediments.
Mapping of these units and their distribution along the regional subcrop sets up a number of prospective targets. In addition, the Elkton and Lower Debolt offer potential along the regional subcrop and in a large outlier.
The study roughly encompasses an area from Township 62 to 71, between Ranges 11W5 and 16W5. At the time of the study over 925 wells penetrated the Shunda in the study area, and 471 wells were selected for the study database. Cored intervals from 36 wells were described at the AEUB Core Research Centre.
Product – Four Volume Report
- fully illustrated text (29 pages plus 23 figures & plates) documenting stratigraphy, depositional facies, geologic evolution, exploration potential, core descriptions and database;
- 6 regional stratigraphic cross sections;
- 7 maps including isopach and structure at 1:100,000 scale, plus 4 figure size maps at ~1:254,000 scale;
- 16 stratigraphic picks (isopach values included) from Base Cretaceous to Top Banff Fm., including 4 unit picks within the Shunda Fm.;
- 471 well database available in digital and hardcopy formats;
- core descriptions from intervals from 36 wells with internally consistent correlations;
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