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Pore-Fractures of Coalbed Methane Reservoir Restricted by Coal Facies in Sangjiang-Muling Coal-Bearing Basins, Northeast China

by 1,2, 1,2,*, 1,2, 1,2 and 1,2
1
School of Energy Resources, China University of Geosciences, Beijing 100083, China
2
Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(5), 1196; https://doi.org/10.3390/en13051196
Received: 17 January 2020 / Revised: 26 February 2020 / Accepted: 4 March 2020 / Published: 5 March 2020
The pore-fractures network plays a key role in coalbed methane (CBM) accumulation and production, while the impacts of coal facies on the pore-fractures network performance are still poorly understood. In this work, the research on the pore-fracture occurrence of 38 collected coals from Sangjiang-Muling coal-bearing basins with multiple techniques, including mercury intrusion porosimetry (MIP), micro-organic quantitative analysis, and optic microscopy, and its variation controlling of coal face were studied. The MIP curves of 38 selected coals, indicating pore structures, were subdivided into three typical types, including type I of predominant micropores, type Ⅱ of predominant micropores and macropores with good connectivity, and type Ⅲ of predominant micropores and macropores with poor connectivity. For coal facies, three various coal facies were distinguished, including lake shore coastal wet forest swamp, the upper delta plain wet forest swamp, tidal flat wet forest swamp using Q-cluster analysis and tissue preservation index–gelification index (TPI-GI), and wood index–groundwater influence index (WI-GWI). The results show a positive relationship between tissue preservation index (TPI), wood index (WI), and mesopores (102 nm–103 nm), and a negative relationship between TPI, WI, and macropores/fractures. In addition, groundwater level fluctuations can control the development of type C and D fractures, and the frequency of type C and D fractures show an ascending trend with increasing groundwater index (GWI), which may be caused by the mineral hydration of the coal. Finally, from the perspective of the pore-fractures occurrence in CBM reservoirs, the wet forest swamp of upper delta plain is considered to be the optimization areas for Sangjiang-Muling coal-bearing basins by a comparative study of various coal facies. View Full-Text
Keywords: pore-fracture network; coal facies; coalbed methane reservoir; Sangjiang-Muling basin pore-fracture network; coal facies; coalbed methane reservoir; Sangjiang-Muling basin
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MDPI and ACS Style

Lu, Y.; Liu, D.; Cai, Y.; Li, Q.; Jia, Q. Pore-Fractures of Coalbed Methane Reservoir Restricted by Coal Facies in Sangjiang-Muling Coal-Bearing Basins, Northeast China. Energies 2020, 13, 1196. https://doi.org/10.3390/en13051196

AMA Style

Lu Y, Liu D, Cai Y, Li Q, Jia Q. Pore-Fractures of Coalbed Methane Reservoir Restricted by Coal Facies in Sangjiang-Muling Coal-Bearing Basins, Northeast China. Energies. 2020; 13(5):1196. https://doi.org/10.3390/en13051196

Chicago/Turabian Style

Lu, Yuejian; Liu, Dameng; Cai, Yidong; Li, Qian; Jia, Qifeng. 2020. "Pore-Fractures of Coalbed Methane Reservoir Restricted by Coal Facies in Sangjiang-Muling Coal-Bearing Basins, Northeast China" Energies 13, no. 5: 1196. https://doi.org/10.3390/en13051196

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