Characterization of the Lower Jurassic Gordondale Member in West-Central, Alberta, Canada, using Organic Geochemical and Petrophysical Methods
Bibliographic record
Abstract
The organic-rich Lower Jurassic Gordondale Mudstone in the Western Canadian Sedimentary Basin, has exceptional unconventional hydrocarbon potential. This study integrates petrographic, organic and trace element geochemistry, and petrophysical techniques, to classify organic and mineral matter variations in the Gordondale, and their effects on unconventional reservoir quality. The depositional environment of the Gordondale is interpreted to range from dysoxic to euxinic bottom waters underling oxygenated, productive surface waters, with minimal detrital clastic input. Sulphur-rich solid bitumen is the predominant organic matter type, making up 90% of the total organic carbon (TOC) content. Fluid-like hydrocarbon residues (FHR) and light free hydrocarbons (LHC) comprise up to 3 vol. % of the whole rock. Solid bitumen has a negative (pore-occluding) effect on present day porosity, permeability, and specific surface area (SSA), while FHR covaries positively with these parameters. This relationship suggests that solid bitumen is detrimental to porosity and does not contribute significant organic porosity at its current level of thermal maturity.
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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 | 0.003 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".