Methane Adsorption During Pore Evolution and Its Microscale Impact on Coalbed Methane Recovery: A Case Study of Middle- and High-Rank Coals in the Western Guizhou
- Ang Xu 1,2, Sijie Han 3,4, Yuanlong Wei 5,6, Peiming Zhou 5,6, Jinchao Zhang 1,2, Zhijun Guo 5,6
- Ang Xu 1,2, Sijie Han 3,4, Yuanlong Wei 5,6
- 1Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China.
- 2School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China.
- 3Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou 221008, China.
- 4Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China.
- 5Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Ministry of Natural Resources, Guiyang, Guizhou 550009, China.
- 6Guizhou Research Institute of Oil & Gas Exploration and Development Engineering, Guiyang, Guizhou 550022, China.
- 0Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China.
Related Experiment Videos
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Coalification enhances methane adsorption sites and capacity by developing micropores, but reduces adsorbed molecular layers. High-rank coals require geological techniques to improve permeability for efficient coalbed methane recovery.
Area Of Science
- Geology
- Earth Science
- Petroleum Engineering
Background
- Coalbed methane (CBM) storage and production are influenced by coal's pore structure and coalification.
- Understanding the evolution of pore characteristics during coalification is crucial for optimizing CBM recovery.
Purpose Of The Study
- To investigate the relationship between pore structure evolution and methane adsorption behavior during coalification.
- To establish the impact of pore structure on CBM storage and gas production.
- To elucidate geology-adapted technologies for enhanced gas recovery.
Main Methods
- Analysis of middle-high rank coals from Western Guizhou.
- Full-scale pore structure characterization (pore type, structure, fractal dimension).
- Methane adsorption isotherm analysis and quantitative characterization of desorption, diffusion, and permeability.
Main Results
- Increasing coal rank expands methane adsorption spaces, primarily through micropore development.
- Mesopore proportion increases while macropores decrease with rising coal rank.
- Saturated adsorption capacity (SAC) correlates strongly with pore structure, dominated by micropores; SAC increases with coal rank, while average adsorbed molecular layers (AAML) decrease.
- High-rank coals show high methane desorption and diffusion but suffer from low permeability.
Conclusions
- Coalification significantly alters pore structure and methane adsorption, increasing adsorption capacity but decreasing adsorbed molecular layers.
- Low permeability in high-rank coals impedes fluid seepage and CBM production.
- Geological compatibility techniques are essential to reduce solid-gas interactions and enhance pore network connectivity for efficient high-rank CBM development.
Related Experiment Videos
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.