Distribution characteristics, genesis analyses, and research significance of Triassic regional structural fractures in the Ordos Basin, Central China
Bibliographic record
Abstract
Through systematic investigations and measurements of Triassic structural fractures on outcrops in the Ordos Basin, as well as massive observations of fractures from drill cores in areas of coverage, combined with the data synthetic analyses of fracture logging, core fracture location, and oil‐field development performance, it is shown that Triassic structural fractures are well developed and mainly vertical or steeply dipping. These fractures are distributed differently in different areas. The fractures usually appear in pairs and belong to X conjugate shear fracture systems: One set is opening fractures with extension‐shear characteristics (striking NE, ENE, or near S‐N), and the other set is closing fractures with compression‐shear characteristics (striking NW, NNW, or near E‐W). Regional horizontal compression as well as the reactivation of basement faults and peripheral faults in the Ordos Basin are responsible for the development of the fracture system. The geodynamic background is the remote tectonic compression produced by the convergence of the Siberia Plate, the Pacific Plate, and the Tethys block during Yanshanian period. Moreover, the Indian Plate converged with the East Asia Continent Plate during Himalayan period. Triassic fractures are mainly formed during Yanshanian, but there are superposition and transformation since the Himalayan period. The distribution, development, and evolution of the fractures in Triassic Yanchang Formation are very important to further study the migration and accumulation of oil and gas as well as exploration and development of low permeable oil‐gas deposits in the Ordos Basin. Furthermore, the origin analysis of regional structure fractures is important to explore the relationship between the Ordos Basin and Qinling orogenic belt.
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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 | 0.003 | 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) | 0.000 | 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 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".