Evaluation of the Clearwater Formation Caprock for a Proposed, Low Pressure, Steam-Assisted Gravity-Drainage Pilot Project in Northeast Alberta
Bibliographic record
Abstract
Abstract In northeast Alberta, Canada, steam-assisted gravity-drainage (SAGD) is used to produce bitumen from the Athabasca oil sands. In some regions, bitumen resources are located within 100 m of the ground surface and have average caprock thicknesses of about 50 m. The caprock unit overlying the bitumen reservoir is comprised mainly of mudstones and shales from the Early Cretaceous, Wabiskaw Member and Clearwater Formation. These shales form a baffle, impeding vertical steam migration and confining the stress and strain fields developed during the SAGD process, which are crucial for maintaining caprock integrity at SAGD operations. In May 2006, an unexpected, catastrophic failure of the caprock seal occurred at the Joslyn Creek SAGD project, resulting in a steam release, which caused considerable caprock and ground surface deformation. Because of this failure, the Alberta Energy Resources Conservation Board modified the existing application guidelines and directives to include an assessment of caprock integrity at the maximum operating pressure specified for the thermal project applications. The authors recently completed a core based, caprock integrity assessment for a proposed, shallow, low pressure SAGD, pilot project in northeast Alberta. This paper describes the information reviewed, assessment method and results of this study. From this evaluation, information about the geomechanical characteristics, the potential for containing the induced stress and strain fields and the geologic risks associated with caprock integrity for the proposed pilot project were determined. An assessment of the underburden seal was also performed as this seal can influence caprock properties. Results of the underburden seal assessment are also presented.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".