Sequence Biostratigraphy and Depositional Modelling of the Pennsylvanian-Permian Belloy Formation Peace River Embayment, Alberta Canada
Bibliographic record
Abstract
The Pennsylvanian-Permian Belloy Formation within the Peace River Embayment (PRE) exhibits excellent reservoir potential and includes approximately 2% of the Western Canada Sedimentary Basin's (WCSB) proven oil and gas reserves. However, it is currently under explored. The formation has been largely overlooked as an exploration target because of difficulties with regional correlations and the lack of a basin wide sedimentological model. This presentation is part of an ongoing project that seeks to address these shortcomings utilizing conodont biostratigraphy and detailed core analysis. The PRE forms a fault-controll ed reentrant that dissected the North American cratonic margin during the Mississippian to Triassic. Previously, it was believed that the mixed carbonate and siliciclastic Pennsylvanian-Permian succession passively filled this embayment. However, it is becoming increasingly clear that block faults that disrupted the underlying Mississippian Stoddart Group also caused offset, differential synsedimentary subsidence and/or up doming in the Belloy. Eight depositional sequences have now been identified within the Belloy Formation. These sequences are being placed into a sequence biostratigraphic framework constructed through lithostratigraphic core based studies and conodont biostratigraphy. Lithofacies maps for each sequence have also been constructed that include previously unrecognized terrestrial sequences. Insights into the nature of the depositional system, in particular the potential tectonic control on lithofacies distribution will greatly enhance economically important exploration strategies and basin evolution models. A contemporaneous outcrop section at Tunnel Mountain, Banff has also been included in this study. This section, despite a markedly contrasting depositional environment from the PRE, has been successfully correlated into the subsurface with the use of outcrop gamma logging and the acquisition of sequence biostratigraphic data. The outcrop studies have extended the applicability of the sequence biostratigraphic framework to the entire WCSB indicating that regional relative sea level fluctuations are the primary control on sequence development for this interval.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".