Depositional interpretation and sequence stratigraphic control on reservoir quality and distribution in the Meramecian Sooner trend Anadarko Basin, Canadian, and Kingfisher Counties (STACK) play, Anadarko Basin, Oklahoma, United States
Bibliographic record
Abstract
ABSTRACT The Mississippian Meramecian play in the greater Sooner trend Anadarko Basin, Canadian, and Kingfisher Counties (STACK) play region is an unconventional reservoir in the Anadarko Basin in westcentral Oklahoma. The play is a fine-grained system composed of quartz silt and sand with varying amounts of carbonate grains and clay. The primary driver of reservoir quality is the quantity of calcite cement. Large volumes of cement are found in coarser-grained, higher-energy facies, whereas porosity is preserved in lower-energy facies, imparting a strong depositional control on reservoir quality. The play interval comprises a system of deep-water prograding parasequences striking northeast-southwest and prograding to the southeast. Inclinations of clinoforms are less than 1°. Depositional conditions are inferred to be similar along strike, resulting in northeast-southwest facies continuity. The depositional interpretation of this system is a subaqueous delta. These are systems of low-angle, shore-parallel clinoforms fed by fluvial input reworked primarily by longshore currents within or below storm wave base. Core and log analyses indicate the play is a lowstand clastic wedge deposited during early sea-level rise. It is bound by a sequence boundary and correlative conformity at its base and capped by a transgressive surface of marine erosion. An intermediate-order, sea-level rise–fall–rise occurs during overall deepening. High-order sea-level changes are manifested as stacked parasequences grading upward from argillaceous and quartz siltstones into calcareous siltstones to sandstones. The identified sequence stratigraphic hierarchy imparts a threefold control on reservoir and nonreservoir architecture, because it drives the volume and distribution of porous and nonporous facies at differing scales.
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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) | 0.000 | 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".