Evaluation of hydrocarbon potential of the Paleozoic (Cambrian–Devonian) source rocks of the Gaspé Peninsula, Québec, Canada: Geochemical characterization, expulsion efficiency, and erosion scenario
Bibliographic record
Abstract
Abstract Several petroleum source rocks and reservoirs are recognized in the Gaspé Peninsula, Québec, Canada, and numerous geochemical data were published on source rocks for wells drilled in both the Cambrian–Ordovician and Silurian–Devonian series. The aim of this work is to evaluate their respective contribution of oil and gas prospects and to prepare geochemical input data for a further basin modeling study. Rocks samples were collected from both series, 46 from the Cambrian–Ordovician formations and 275 from the Silurian–Devonian formations. They were collected mainly from well cuttings, and a few of them come from outcrops. Most of the Silurian–Devonian rocks are lean rocks with organic carbon content (Corg) lower than 0.5%. They exhibit systematic abnormal S1 (free hydrocarbons) and S2 (potential hydrocarbons) peaks from Rock-Eval 6 profiles, with compounds detected before and after the S2 peak. However, typical S2 peak profiles were obtained in isolated kerogens after solvent extraction. Kerogens were sorted with increasing depth. Between 1200 and 2600 m (3937–8530 ft), the observed hydrogen index (HI) value decrease is correlated with an H/C ratio decrease and a vitrinite reflectance (Ro) increase. The amount of extract is about 200 mg/g C whatever the burial depth. These results suggest that Silurian–Devonian rocks underwent thermal maturation between 0.8 and 1.4% Ro. Their capacity to expel oil seems to be very limited; however, they have potential as gas shale. Finally, a minimum regional erosion thickness about 4300 m (∼14,108 ft) was derived by comparing the computed HI evolution with the observed trend for a geothermal gradient at 23°C/km. For the Cambrian–Ordovician rocks, Corg values are richer in both immature and mature samples. The S1 and S2 peaks from Rock-Eval 6 profiles are standard with HI values more than 300 to 400 mg/g C. The Ro being more than 1.6%, these source rocks are more oil than gas prone.
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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 | 0.001 | 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".