Analysis of P-wave and S-wave Data on Near-surface Potential Hydrocarbon Indicators
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Bibliographic record
Abstract
The combined use of compressional (P-waves) and shear-waves (S-waves) seismic reflection data is appealing for providing insights into the prospectivity of petroleum systems because P-waves are sensitive to fluids and S-waves are not. This analytical method is tested on two potential hydrocarbon indicators located in a prospective area of the St. Lawrence Platform in Eastern Canada: a zone where P-bedrock reflections are blanked and a zone where high-amplitude P-reflections within the unconsolidated sediments are pulled down. For the blanked zone, S-reflections remain bring suggesting that gas is migrating vertically through fractured gas-prone shales. This is supported by P-velocity analysis showing a marked decrease of velocity over the blanked zone. The high-amplitude pulled down P-reflections appear mostly flat on S-wave data but S-amplitudes show a vertically disturbed zone sharply bordered by bright reflections. Velocity analyses indicate a drastic and slight decrease for P- and S-wave data respectively. P-anomalies are believed to result from gas venting through fractured shales into the unconsolidated sedimentary column. However, S-amplitude anomalies are probably due to local changes of the physical properties (e.g. density) of the matrix induced by fluid migration.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 it