Anomalous reflection amplitudes from fractured reservoirs—Failure of AVOA?
Bibliographic record
Abstract
A fractured reservoir embedded in an isotropic background is equivalent to an anisotropic medium whose symmetry depends on fracture orientation. For this configuration, a variation of PP-reflection amplitude as a function of azimuth, φ at a given incidence angle is often observed. Here we report on an observation of unusual amplitude behavior for reflections from the top Cadotte and Falher formations in the Lynx Field, Western Canadian Sedimentary Basin, Alberta, Canada. Formation microscanner (FMS) images suggest considerable fracturing in the shallower Cadotte interval and resistivity measurements show fracturing in the Falher zone. Interestingly, reflection amplitudes from the Cadotte do not show the expected azimuthal variation consistent with a vertically fractured medium. Reflections from the deeper Falher interval, however, do exhibit large, unexpected azimuthal variation.
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How this classification was reachedexpand
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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 teacher head, 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".