Wavefield simulation of 3D borehole dipole radiation
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Bibliographic record
Abstract
Reflections in acoustic borehole logging data can be used to image near-borehole geological structures, either using monopole or dipole measurements, the latter of which resolve azimuthal ambiguity. But accurate tools for wavefield simulation are required to account for wave modes in and out of the borehole, and for the receiver responses to these modes. In this paper, a 3D elastic staggered-grid finite difference method for both isotropic and anisotropic media is discussed in the context of the borehole acoustic imaging problem. Numerical simulation of radiation, reflection and multipole reception of elastic waves, excited by a dipole source, is carried out. In order to optimize azimuthal detection, the relationships between S wave polarization and both source-receiver offset and source-reflector angle are analyzed. Results indicate that the S-S reflection is most sensitive to the angle between the incident ray and the normal to the reflector. Its maximum amplitude occurs as the incident angle reaches critical, a fact that can be used to calculate the total propagation distance of the S-S wave. The critical angle as well as the SH wave velocities of geological structures outside the borehole can thus be determined. Presentation Date: Thursday, October 20, 2016 Start Time: 9:20:00 AM Location: 168 Presentation Type: ORAL
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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 | 0.000 |
| 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 it