Elastic properties of rock salt: Lab measurements and well log analysis in the Gulf of Mexico
Bibliographic record
Abstract
Summary Seismic imaging and interpretation of regions with salt structures can be challenging. Velocity model building highly relies on the comprehensive understanding of evaporites’ compositions, properties and tectonics. We combine lab measurements and well-log data analysis to determine the compositional and elastic properties of salt crystals and rocks, especially in the Gulf of Mexico area. We tested pure halite samples from the Goderich Mine, Ontario using ultrasonic methods and found the samples to display cubic anisotropy. Measurements for Gulf of Mexico salt samples, however, are complicated due to the compositions, micro-cracks and crystalline aggregates orientations. They appear isotopic. The velocities measured in the lab ranges from 4.43 to 4.75 km/s and 2.46 to 2.92 km/s for P and S waves, respectively. The density ranges from 2.15 to 2.18 g/cm3. From a study of 142 log suites of boreholes drilled through salt in the Gulf of Mexico, we find a trend of P-wave velocity Vp(km/s) increases with depthD(km): Vp = 4.41 + 0.0145D. Our fitted curve and its variation provide the reference for initial velocity models. For salt density, our electron density readings concentrate around 2.06±0.1 g/cm3. All of these measurements assist in understanding salt and seismic velocity model building.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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".