Measurement of minimum horizontal stress from logging and drilling data in unconventional oil and gas
Bibliographic record
Abstract
This study utilizes logging data, drilling data and core reports to generate the minimum horizontal stress (Sh) profile for two Montney wells in North East British Columbia. Specific value of tectonic stress or strain determined from injection fall off analysis is included in the calculation. The conventional method calculates Sh by solving the linear poro-elasticity equations. The Blanton Olson method incorporates the tectonic, thermal effect and rock mechanical properties at each incremental depth. The vertical transverse isotropy (VTI) method, assumes different rock properties and tectonic strain in different directions. The Harikrishnan method calculates the Sh from the rock strength value at a given depth obtained either from logging or drilling data. The conventional method yields the Sh magnitude without any distinctive characteristic. VTI method shows higher stress magnitude above the Montney and reveals some good zone containment for hydraulic fracturing design. All methods have equivalent stress magnitude for Montney formation.
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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 | 0.001 | 0.002 |
| 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 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".