Modeling Overpressure Development and the Mechanical Behavior of Sediments in a Complex, Tectonically Active Setting: East Coast Basin, New Zealand
Bibliographic record
Abstract
Abstract The East Coast Basin (ECB) is a complex, active convergent margin located on the North Island of New Zealand, where variable but commonly very high overpressures occur in Cretaceous to Pleistocene stratigraphy. Using a consistent set of sediment physical properties and a single value for tectonic compression, a multi‐1D hydro‐mechanical modeling approach was employed to evaluate the primary controls on overpressure and porosity across a 40 km section of the ECB. The 1D hydro‐mechanical models simulated the geological histories of five key wells across the ECB and investigated overpressure generated by burial disequilibrium compaction and tectonic compression. Present‐day overpressure is associated with tectonic compression within the last 3 million years due to the subduction of the Pacific Plate beneath the Australian Plate; this has generated up to 18 MPa of overpressure at a depth of 2,000 m. Burial disequilibrium compaction contributed up to 4 MPa at the same depth. Whilst erosive events can lead to the dissipation of overpressure, the effects of all but the most recent erosive event are masked and overprinted by subsequent sedimentation. In some areas and in specific parts of the stratigraphy, overpressure appears to dissipate through lateral fluid flow. Throughout a complex geological history including several episodes of burial, tectonic compression and erosion, critical state soil mechanics models suggest that mechanical changes in mudstones and fine‐grained carbonates occur almost entirely through compaction rather than dilation (shear).
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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".