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Pore Size Evolutionary Mechanism of Anthracite Induced from Water-Rock Interactions
Bo Wang1, Bin Gao2, Lilong Wang3
1Information Research Institute of the Ministry of Emergency Management, Beijing 100029, China.
ACS Omega
|March 10, 2025
Summary
Water-rock interactions significantly alter coal pore structure, affecting coalbed methane extraction. High mineralization and flow rates shift interactions to smaller pores, enhancing methane recovery potential.
Area of Science:
- Geochemistry
- Petrology
- Energy Science
Background:
- Water-rock interactions critically impact coalbed methane (CBM) extraction efficiency by altering subsurface pore structures.
- Understanding these interactions is vital for optimizing CBM recovery and reservoir management.
Purpose of the Study:
- To investigate the influence of water-rock interactions on coal seam #3 pore structure in the Fanzhuang block.
- To analyze how varying mineralization rates and flow rates affect coal pore characteristics.
Main Methods:
- Physical simulation cross-experiment designed to mimic water-rock interactions.
- Comparative analysis of coal pore structure changes under different experimental conditions (mineralization and flow rates).
Main Results:
- Water-rock interaction sites are primarily in meso- and macropores, shifting to micro- and small pores under high mineralization and flow rates.
- Dissolution of soluble minerals causes micropores to merge into mesopores; macropore cementation weakens, leading to transformation into mesopores.
- High mineralization and a flow rate of 0.30 mL/min showed a significant effect on pore structure, increasing ion concentration, pH, and mineralization.
Conclusions:
- Water-rock interactions dynamically modify coal pore structure, with significant implications for CBM extraction.
- Optimizing CBM production systems can be informed by the findings on pore structure evolution under specific water chemistries and flow conditions.
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