An organic geochemical study of outcrop oil shows in the Colville Hills, Mackenzie Corridor: oil-saturated Quaternary sand and Cretaceous sandstone and oil-stained Devonian dolostone
Bibliographic record
Abstract
Outcrop samples collected from some visually oil-stained or oil-saturated exposures in the Colville Hills area were submitted for bulk and molecular organic geochemical analyses to investigate their crude oil quality, sources of the hydrocarbons, and/or their potential as petroleum source rocks. Results show that the apparently oil-stained Devonian Bear Rock Formation dolostone interval at Lac à Jacques cannot be considered as an effective source rock due to its low content of organic matter, nor can it be an efficient reservoir rock due to its low oil content. The Quaternary (?) oil sand deposit at Lac des Bois and the oil-saturated Cretaceous sandstone at Belot Ridge both contain hydrocarbons that have been subjected to very heavy to severe biodegradation, with a majority of their saturated and aromatic compounds having been removed due to microbial activities. Within their saturated and aromatic fractions only terpane biomarkers can be detected in these bituminous sands or sandstone. Although the characteristics of their main source rocks cannot be ascertained, their different distributions of tri-, tetra- and penta-cyclic terpanes appear to indicate that oil charges to the Quaternary sand at Lac des Bois and the Cretaceous sandstone at Belot Ridge are from source rock units developed within different depositional environments.
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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 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".