Analysis of microfractures in Lower Cretaceous and Upper Jurassic sandstones of the Scotian Basin, offshore Nova Scotia
Bibliographic record
Abstract
Microfractures have been investigated in potential reservoir sandstones in four wells from the eastern Scotian Basin. Samples were selected from within the overpressured zone in Venture B-52, just above overpressure in Venture 1, in an intensely silica-cemented interval in South Griffin J-13 and from a deeply buried sandstone lacking overpressure in a dry well, Peskowesk A-99. Backscattered electron (BSE) and cathodoluminescent (CL) images were acquired from polished thin sections. Microfractures (<100 micrometres wide) were classified as intragranular, intergranular, transgranular, intra-cement and hydro-fractures. The size and orientation of different microfractures were measured and their relationship to diagenetic paragenesis was assessed. Most microfractures are either bedding-parallel or at 45° to bedding. Generation 1 fractures probably result from eodiagenetic compaction; Generation 2 fractures are synchronous with mesodiagenesis; and Generation 3 fractures are open. This Open File presents the SEM data, measurements of size and orientation by fracture type, and a preliminary interpretation of the fracture data.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".