Coupling Mechanism of THMC Fields in Crushed Soft Coal with Low Permeability after CO<sub>2</sub> Injection and Its Application in CO<sub>2</sub>-ECBM Technology
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Bibliographic record
Abstract
During the CO 2 -ECBM process in crushed soft coal with low permeability (CSLP-Coal), the analysis of the fully coupled mechanism of the thermo-hydro-mechanical-chemical (THMC) fields is conducive to engineering promotion of CO 2 -ECBM technology. In this study, the CSLP-Coal in Huainan and Huaibei coalfields was taken as the research object; the fully coupled mathematical models of THMC fields were established; the effects of injection pressure, temperature, and initial permeability were studied; the evolution connotation of reservoir permeability was discussed; and the reaction mechanism of the chemical field was analyzed. The evaluation system of the CO 2 -ECBM project in CSLP-Coal was further established. The results show that the mathematical models of THMC fields are fully coupled during the CO 2 -ECBM process. Injection pressure, temperature, and initial permeability have great influence on the CO 2 -ECBM technology. The variation of reservoir permeability is mainly influenced by the effective stress effect and competitive adsorption effect of CH 4 /CO 2 . The formation of a geochemical reaction system with CH 4 /CO 2 -H 2 O-coal is conducive to the engineering popularization of the CO 2 -ECBM technology. Based on the three indexes, the evaluation system for the practical effectiveness of CO 2 -ECBM engineering in CSLP-Coal in Huainan and Huaibei coalfields can be constructed. This study has important theoretical and practical significance for improving the recovery efficiency of CH 4 and enhancing the ability of CO 2 storage in CSLP-Coal.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it