Source Rock Potential and Thermal Maturity of the Coqueiros Formation Shales, Campos Basin, Brazil
Bibliographic record
Abstract
Summary This study investigates the source rock potential of organic-rich shales within the Early Cretaceous Coqueiros Formation, Campos Basin, Brazil. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy were applied to cuttings from two wells (3-BP-11-RJS and 6-DEV-18P-RJS). XRD reveals a mixed mineralogy of calcite, quartz, dolomite, and clay, with varying proportions between wells, suggesting differing depositional environments. Pyrite, indicative of anoxic conditions favorable for organic matter preservation, was observed. Raman spectroscopy indicates high thermal maturity (Ro% 1.03–1.40), placing the shales within the condensate wet gas window. SEM imaging of 6-DEV-18P-RJS shows evolving textures with depth and the presence of authigenic minerals and intergranular porosity, potentially facilitating hydrocarbon migration. While the high maturity and mineralogical indicators suggest good source rock potential, further geochemical analyses (TOC, Rock-Eval) are needed for definitive assessment. The potential impact of drilling mud contamination (barite) requires further evaluation.
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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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".