Assessments of gas hydrate concentrations estimated from sonic logs in the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate research production well
Bibliographic record
Abstract
The amount of in situ gas hydrate in the pore spaces of sediments penetrated in the JAPEX/JNOC/GSC et al. Mallik 5L-38 well in the Mackenzie Delta, Canada, has been calculated from various well logs including compressional-wave velocity, shear-wave velocity, electrical resistivity, and nuclear magnetic resonance porosity logs. Gas hydrate concentrations estimated from acoustic logs compare favorably to estimates from resistivity and nuclear magnetic resonance porosity logs in sandy intervals; however, gas hydrate concentrations estimated from acoustic and nuclear magnetic resonance porosity logs differ noticeably within shaly intervals. Acoustic, resistivity, and nuclear magnetic resonance-derived gas hydrate concentrations are as much as 80 - 90% of pore space in clean sandstone intervals. The Poisson's ratio of gas-hydrate-bearing sediments is slightly higher than corresponding non-gas-hydrate-bearing sediments and the effect of gas hydrate on elastic velocities is dominated by the pore-filling characteristic and does not appear to cement sediment grains in this lithological setting.
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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 | 0.001 | 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".