A Regional Geologic Framework for the Athabasca Oil Sands, Northeastern Alberta, Canada
Bibliographic record
Abstract
Abstract During the past 15 to 20 yr, detailed work conducted by the Alberta government, including the Alberta Geological Survey and the Energy Resources Conservation Board, allows for a better understanding of the Athabasca oil sand deposit, hosted primarily by the McMurray Formation in northeastern Alberta. Much of this work has relied on regional-scale mapping facilitated through lithofacies analysis of outcrops, cores, and well logs, along with petrographic, grain-size, and palynofacies analysis. In the past, the McMurray Formation has been informally subdivided into lower fluvial, middle estuarine, and upper coastal-plain successions. Results from regional lithofacies analysis and stratigraphic correlation and geologic modeling for the Athabasca oil sands show that much of the preserved stratigraphy is fragmented, that no clear distinctions can be made between the middle estuarine and upper coastal plain lithofacies associations, and that no single model applies to the total succession that is preserved. At least five major unconformities and disconformities separate different system tracts, and they should not be considered to be parts of a single entity or single depositional systems tract. Within each of the original systems tracts are preserved remnants of fluvial, estuarine, and bay-fill successions; some of which are amalgamated or juxtaposed to one another, making geologic interpretations and correlations difficult. In areas of reduced accommodation space, not all the paleoenvironments are preserved. This area of reduced accommodation space occurs in the central and southern parts of the Athabasca oil sand area, where most of the existing and future in-situ technologies will be used to produce the bitumen. Recognition of the proper paleoenvironmental setting is critical for the prediction of reservoir heterogeneity, including lateral and vertical segregation of bitumen from overlying gas and water reservoirs that may be thief zones to in-situ (mostly thermal) bitumen production. The development of a regional geologic framework, using the principles of sequence stratigraphy, allows regional mapping within the different time-transgressive systems to be integrated and allows for the full understanding of the geologic framework for the oil sands. This regional geologic framework is being used by the Energy Resources Conservation Board to assess applications for exploration and development of the oil sands and aids in assessing resources and reserves for the province.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.009 | 0.011 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.004 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 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".