ROCK CHARACTERIZATION AND STRATIGRAPHY OF THE MISSISSIPPIAN STRATA, MERAMEC / SYCAMORE. MERGE PLAY, CENTRAL OKLAHOMA
Bibliographic record
Abstract
Historically, Mississippian rocks (Meramec / Sycamore Fms.) have been a productive oil and gas formations in Oklahoma. This study followed upon two major plays that were recently identified, The Sooner Trend Anadarko Canadian Kingfisher (STACK) play and the South-Central Oklahoma Oil Province (SCOOP) play. Few studies have been published about these plays, and even less is known about the Merge play, that as the name suggests is connection between the STACK and SCOOP plays. This study identified the factors that control the stratigraphy and reservoir quality of Meramec/Sycamore and Woodford strata to build a predictive sequence stratigraphic model. \nDescription of two cores, thin sections, scanning electron microscopy (SEM), and X-Ray fluorescence spectroscopy (XRF) were used for the identification, analysis, and interpretation of litho- and chemofacies. Differences in geologic factors like conditions of deposition, sediment source, and burial diagenesis resulted in two major facies associations: gravity flows, and hemipelagic sediments. Gravity flows are mainly massive (unstructured) calcite-cemented siltstones and hemipelagic facies are mainly laminated and bioturbated facies. \nPorosity/permeability, hardness, TOC and rock-eval data were used to evaluate the range of reservoir quality and production potential of the two rock types. There are two main types of calcite in the facies, allochems and blocky calcite cement. In the gravity flow facies, blocky calcite cement precipitated during diagenesis and consequently occludes the original porosity but in the hemipelagic facies, calcite has not been precipitated thus it does not occlude the porosity. The amount of carbonate allochems controls the hardness of the rock in the hemipelagic facies, with more allochems resulting in harder rock. \nBulk-rock carbon and oxygen isotopic composition (δ13C and δ18O) were used to interpret the origin of the blocky calcite cement and to build a relative time framework. The data suggest a marine bioclastic source of the carbonate from surrounding beds as the origin of the blocky calcite cement. Changes in the composition of the rock, in this case isotopic (δ^13 C) and elemental composition, were used to build a relative time framework and strengthen the sequence stratigraphic model. Based on this, it seems that the Mississippian/Pennsylvanian unconformity eroded the uppermost section of Mississippian strata in the Merge play. \nWhile unconventional resources contain specific sweet spots and target zones, this integrated study demonstrates that geologic factors are still the path to quantifying and characterizing the rock potential. \nAn integrated study like this one depends on conditions of deposition, sediment source, and diagenesis -including distribution of the facies in the Merge play- and provided a chronostratigraphic framework, and a robust sequence stratigraphic model which provides a tool to interpret and predict genetically related depositional units in the available space. From this, sweet spots and anomalous zones could be detected.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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 teacher head, 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".