Research on the Multiscale Microscopic Pore Structure of a Coalbed Methane Reservoir

Xiuqin Lu, Lei Liu, Liang Zhou, Gloire Imani, Zhong Liu, Haoyu Wu, Hai Sun () and Huili Fang
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Xiuqin Lu: Pilot Test Base for Coalbed Methane Production, China National Petroleum Corporation, Renqiu 062550, China
Lei Liu: Research & Development Center of Bureau of Geophysical Prospecting, China National Petroleum Coproration, Zhuozhou 072750, China
Liang Zhou: National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
Gloire Imani: National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
Zhong Liu: Pilot Test Base for Coalbed Methane Production, China National Petroleum Corporation, Renqiu 062550, China
Haoyu Wu: Pilot Test Base for Coalbed Methane Production, China National Petroleum Corporation, Renqiu 062550, China
Hai Sun: National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
Huili Fang: Engineering Technology Research Institute, Huabei Oilfield Company, Renqiu 062550, China

Energies, 2024, vol. 17, issue 5, 1-14

Abstract: Coal rock pores are the space in which coalbed gas is stored and flows. Accurately characterizing the pore structure of coalbed gas is the foundation of coalbed gas reserve assessment and production forecasting. Traditional experimental methods are unable to characterize the multi-scale pore structure characteristics of coal rock. In this paper, a multi-scale pore structure characterization method is proposed by coupling various experimental methods, including low-pressure nitrogen gas adsorption experiments, X-ray computed tomography (XCT) imaging technology, and scanning electron microscopy (SEM). Using Zhengzhuang coalbed gas as an example, the micro-pore structure of coalbed gas reservoirs is characterized and depicted from a multi-scale perspective. The results indicate that a single experimental approach can only partially reveal the microstructure of coal rock pores. The combined use of multiple methods can accurately reveal the full-scale microstructure of coal rock pores. The pore structure of the experimental coal rock samples exhibits multi-scale characteristics, with a complex variety of pore types, including inorganic pores, organic pores, and fractures. Organic pores are predominant, with a small number of inorganic pores, and their sizes range from 2 nm to 50 ?m. Mineral particles and fractures are observed at both the nanoscale and microscale, exhibiting typical multi-scale characteristics, with quartz being the predominant mineral.

Keywords: coalbed methane; pore structrue; multiscale; SEM-MAP (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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