Genesis of Coalbed Methane and Its Storage and Seepage Space in Baode Block, Eastern Ordos Basin

Hao Chen, Wenguang Tian, Zhenhong Chen, Qingfeng Zhang and Shu Tao
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Hao Chen: PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
Wenguang Tian: PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
Zhenhong Chen: PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
Qingfeng Zhang: PetroChina Coalbed Methane Company Limited, Beijing 100028, China
Shu Tao: School of Energy Resources, China University of Geosciences, Beijing 100083, China

Energies, 2021, vol. 15, issue 1, 1-17

Abstract: The Baode block on the eastern margin of the Ordos Basin is a key area for the development of low-rank coalbed methane (CBM) in China. In order to find out the genesis of CBM and its storage and seepage space in Baode block, the isotopic testing of gas samples was carried out to reveal the origin of CH 4 and CO 2 , as well, mercury intrusion porosimetry, low temperature nitrogen adsorption, and X-ray CT tests were performed to characterize the pores and fractures in No. 4 + 5 and No. 8 + 9 coal seams. The results showed that the average volume fraction of CH 4 , N 2 , and CO 2 is 88.31%, 4.73%, and 6.36%, respectively. No. 4 + 5 and No. 8 + 9 coal seams both have biogenic gas and thermogenic methane. Meanwhile, No. 4 + 5 and No. 8 + 9 coal seams both contain CO 2 generated by coal pyrolysis, which belongs to organic genetic gas, while shallow CO 2 is greatly affected by the action of microorganisms and belongs to biogenic gas. The average proportion of micropores, transition pores, mesopores, and macropores is 56.61%, 28.22%, 5.10%, and 10.07%, respectively. Samples collected from No. 4 + 5 coal seams have developed more sorption pores. Meanwhile, samples collected from No. 8 + 9 coal seams exhibited a relatively low degree of hysteresis (Hg retention), suggesting good pore connectivity and relatively high seepage ability, which is conducive to gas migration. The connected porosity of coal samples varies greatly, mainly depending on the relative mineral content and the proportion of connected pores.

Keywords: genesis of coalbed methane; pore-fracture system; storage and seepage space; Baode block (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: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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