Quantitative 3D seismic interpretation of Silurian reef structures in southern Ontario, Canada
Bibliographic record
Abstract
Abstract We use 3D, single-component seismic reflection data, integrated with core samples and geophysical well logs, to interpret the geomorphology and petrophysical properties of Silurian carbonate structures at the South Bruce Site in southern Ontario, Canada. This site has been evaluated for the development of a deep geological repository for the secure long-term containment of Canada’s spent nuclear fuel. The Paleozoic sedimentary sequence at the site includes Silurian-aged carbonate reef complexes, within the Lower Silurian Lockport Group, which are of interest due to their potential influence on subsurface stability, groundwater flow dynamics, water chemistry, and geomechanical properties. We use qualitative and quantitative interpretation techniques, such as 3D seismic interpretation, multiattribute analysis, spectral decomposition, and simultaneous prestack seismic inversion, to delineate the spatial distribution, morphology, dimensions, and petrophysical properties of these structures. Our analysis identifies three carbonate structures: the Main Reef, Incipient A, and Incipient B, where “incipient” refers to a potential early stage carbonate buildup. Borehole data confirm the reefal origin of the Main Reef, while Incipient A and Incipient B are interpreted as potential reefal structures based on their geophysical characteristics. Their seismic signatures share similarities, such as reflection patterns and internal heterogeneities, but exhibit variations in morphology and dimensions. The Main Reef has the largest volume and an L-shaped geometry, while Incipient A and Incipient B have smaller volumes, with Incipient A forming an elongated ridge-like structure and Incipient B presenting a mounded shape. Spectral and geometry-based seismic attributes effectively delineate the boundaries of these structures while distinguishing internal properties from the surrounding materials. Petrophysical attributes, such as acoustic impedance and VP/VS ratio, identify zones of dolomitization and karstification within the Main Reef, consistent with borehole data and regional models of similar reefs in southern Ontario.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.004 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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".