Precambrian Basement Influence on the Deposition of the Upper Ordovician Utica Shale Play in East Central Ohio
Bibliographic record
Abstract
The Ordovician Utica shale play is a major oil and gas producing interval in the Appalachian Basin. The Utica shale play can be found as far as New York and Canada and to the south into Indiana and Kentucky. The play consists of the Trenton/Lexington limestones, Point Pleasant Formation, and Utica shale. The shallow marine fossiliferous limestones of the Trenton and shallow marine shaley limestones of the Lexington are overlain by an interbedded shale and limestone of the Point Pleasant Formation, which grade into the deeper marine interbedded shales and limey shales of the Utica. These formations are highly heterogeneous, varying not only vertically but laterally as well. Pockets of preferential carbonate deposition in a primarily siliciclastic formation or vice versa have been noted throughout the basin, which also contain pockets of organic matter enrichment. Controls on deposition have been studied on a global (eustatic) scale, or at large scales across the basin. This research studies the Utica shale system on a county scale, detailing potential structural influences on deposition. A combination of core and well log analyses were used to create detailed structure and isopach maps across east central Ohio. Results show that there are areas of thickening of the underlying carbonate platform (Trenton/Lexington limestones) overlain by thin fine-grained siliciclastic deposits (Utica/Point Pleasant), suggesting movement of basement blocks along pre-existing Proterozoic basement faults creating localize topographic highs and lows. The Utica shale also thickens along the northern side of the study area, suggesting that the Sebree Trough further extends into northeastern Ohio. This research: (1) helps formalize the Utica shale in Ohio; (2) provide evidence for Sebree Trough extension into northeast Ohio; and (3) further demonstrates the reactivation of structures throughout the formation history of the Appalachian Basin.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".