Burrow-Mottled Carbonates in the Devonian Wabamun Formation, Pine Creek Gas Field, Alberta, Canada
Bibliographic record
Abstract
In this study area, the Devonian (Famennian) Wabamun Group consists of a series of stacked cyclical shallow water ramp carbonates that were deposited during a regressive cycle. In the Pine Creek Field (Township 56-58, Range 19-20 W5), hydrocarbons are produced mainly from the Normandville Member of the Wabamun Group (cumulative gas production 455 Bcf). The Normandville Member consists of cyclical mudstones, intraclast wackestones, and peloidal grainstones. They were deposited on an expansive, open ramp and are characterized by extensive bioturbation, scarce shelly fossils, and by pervasive presence of peloids and intraclasts. The dolomitized peloidal grainstone zones are found at different stratigraphic levels within the ramp and constitute the major reservoirs in this play. Relationships between the biogenically-mediated substrate and porosity enhancement particularly within the Normandville Member suggest paleobiological controls on the reservoir development. Preferential dissolution and precipitation of dolomite occurs within and adjacent to burrow fabrics. The local diagenetic heterogeneities suggest a paleobiological control on succeeding dolomitization patterns. Fluid flow through burrow-mottled carbonates is notably tortuous and is similar to that seen in fractured reservoirs. These strata act as dual permeability systems (high permeability within the burrow networks and low permeability in surrounding matrix). An understanding of burrow fabrics, and paleobiological influenced dolomites and their distribution patterns provide a useful tool to exploitation and improve reservoir characterization accuracy. In the Normandville Member the ichnofossils constitute the reservoir and the understanding of anisotropic permeability trends is of fundamental importance to the successful exploitation of this and similar carbonate reservoirs.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".