Rock Physics Case Studies of Western Canada Unconventional Plays
Bibliographic record
Abstract
Summary Canada has been the second largest unconventional oil and gas producer. The target rocks of unconventional shale/silt/carbonate plays span over 300 million years in geological time from Devonian to Cretaceous. Understanding the elastic parameters of these shale plays and comparing them to the existing production is important and have become critical for drilling sweet spots. Petrophysical and petrographic analysis provide a good insight to the lithology and clay content but does lack the understanding of geomechanics, stresses and fracture distribution. Elastic properties analysis of the well logs through Lambda-Rho vs Mu-Rho crossplots and other calibrated modulii allows interpreters to derive equivalent rock physics properties through pre-stack inversion. Three case studies will be presented starting from Devonian calcareous shale followed by Triassic deep water shales and ending with silty source rock shales of Cretaceous age. The goal of these studies is to understand the critical information that can be derived from well logs for successful commercial production.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".