Controls on Bitumen Distribution in Northwestern Saskatchewan's Lower Cretaceous Dina Member (Mannville Group)
Bibliographic record
Abstract
Summary Recent research in the extreme northwestern segment of Saskatchewan’s portion of the Western Canadian Sedimentary Basin has been carried out to understand the bitumen trapping mechanisms and bitumen distribution controls in Lower Cretaceous Mannville Group deposits.The study area is located directly adjacent to the Alberta-Saskatchewan border and north of the Clearwater River Valley in Townships 94 and 95, Ranges 24 and 25W3M. The recently completed work has shown that bitumen trapping in the study area is primarily controlled by stratigraphic pinch-out of the Lower Cretaceous Mannville Group’s Dina Member (McMurray equivalent). The Dina Member on-laps Devonian carbonates and was presumably overlain by a relatively expansive Cummings Member shale. When the oil migrated from the southwest to the northeast into Dina Member sandstones, it was trapped where the sandstones pinch-out between the impermeable Devonian carbonates and a Cummings Member shale. Unfortunately, the presence of a Cummings Member shale is only presumed to have been present since it is no longer preserved in the study area due to Quaternary erosion. A secondary trapping mechanism in the study area is related to lateral and vertical facies changes. A relationship can be identified between the facies architecture within the Dina Member and the distribution of bitumen in the study area. In general, areas coincident with sandstone rich facies result in higher bitumen saturation while those areas up-dip of mud filled abandoned oxbow lakes and inclined heterolithic stratification (IHS) deposits tend produce areas with multiple oil-water contacts and/or significant water saturated sandstones.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".