Abstract: Reconciliation? Oil industry data in light of revised Iberia-Newfoundland rift models
Bibliographic record
Abstract
The petroleum industry has a long history of exploring for and producing hydrocarbons in rift basins. Many of the pioneering and persisting concepts of rift development are based on industry-generated data. Structural and stratigraphic features commonly recognized in rift basins are known to be critical elements in the trapping of oil and gas. Such elements include initiation and termination of brittle extension in the upper continental crust (i.e. faulting) and changes in the rate and distribution of extension. In addition to providing the basis for hydrocarbon-play type recognition and quantification of specific prospects, these rift basin data and models have been useful in illuminating specific chapters in the history of global plate tectonics. Recognition of the start and end of extension are important in distinguishing structural versus stratigraphic traps and in characterizing structural controls on sediment input and deposition within prospective rift basins. Unconformities associated with these two end points of extension have been referred to as “rift onset” and “break-up” unconformities. One assumption has been that the “break-up” unconformity commonly recognized at the termination of extensional faulting was a response to the complete failure of the lithosphere and synchronous initiation of sea-floor-spreading along a newly formed oceanic ridge. Relatively recent compilations of data from ODP drilling of the Iberia and Newfoundland margins, in conjunction with widely uplifted exposures of rift-related strata in the Alps, have called into doubt the validity of this assumption. These non-industry data and models indicate passage of a considerable period of time between the end of extension recognizable in the upper continental crust versus complete separation of tectonic plates with coeval initiation of sea-floorspreading. Implications of this apparent discrepancy include possible invalidation of models in use by the petroleum industry, revision of previously-coined terminology, and revised understanding of the timing of specific plate-tectonic events. These elements will be addressed using industry data from the Jeanne d’Arc Basin in comparison with current models of the Iberia-Newfoundland rift to drift history.
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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 | 0.004 | 0.008 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.006 | 0.009 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.004 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".