Shallow VSP Survey using a Small Vibrator Source
Bibliographic record
Abstract
Summary A shallow VSP survey was conducted in the Rothney Test Well using an EnviroVibe surface source and a downhole clamping 3C geophone in the well. The goal was to evaluate VSPs for imaging thin-bed stratigraphy in the near-surface environment. Two offset VSPs were obtained with the vibrator located 15m and 30m south of the wellhead. The vertical component data were subjected to wavefield separation to remove down-going P-wave and S-wave events, as well as other up-going and down-going low-velocity events. The residual up-going P-wave reflections were mapped using a simplified VSP/CDP procedure. The reflections on the resulting reflectivity maps corresponded closely to the near-surface stratigraphy of the Paskapoo formation as identified by sonic velocity, resistivity, and natural gamma-ray logs. The project confirmed that the EnviroVibe vibrator used in near-surface VSP surveys produces enough high-frequency energy to be effective for imaging relatively thin stratigraphy in the upper 100m.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".