Methane adsorption characteristics and adsorbed gas content of low-rank coal in China

Li, Xin, Fu, Xuehai, Liu, Aihua, An, Hui, Wang, Geoff, Yang, Xuesong, Wang, Lijun and Wang, Hongdong (2016) Methane adsorption characteristics and adsorbed gas content of low-rank coal in China. Energy and Fuels, 30 5: 3840-3848. doi:10.1021/acs.energyfuels.6b00071


Author Li, Xin
Fu, Xuehai
Liu, Aihua
An, Hui
Wang, Geoff
Yang, Xuesong
Wang, Lijun
Wang, Hongdong
Title Methane adsorption characteristics and adsorbed gas content of low-rank coal in China
Journal name Energy and Fuels   Check publisher's open access policy
ISSN 1520-5029
0887-0624
Publication date 2016-05-19
Year available 2016
Sub-type Article (original research)
DOI 10.1021/acs.energyfuels.6b00071
Open Access Status Not yet assessed
Volume 30
Issue 5
Start page 3840
End page 3848
Total pages 9
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2017
Language eng
Formatted abstract
Coalbed methane (CBM) reserve of low-rank coal (Ro,max < 0.65), occupying a proportion of more than 40% of the total CBM reserve of China, is 14.7 × 1012 m3. The exploration degree, particularly in situ gas content estimation of low-rank CBM reservoirs in China, is extremely low. Meanwhile, adsorption characteristics of low-rank coal reservoirs have not been revealed comprehensively. In this study, methane isothermal adsorption experiments of 30 low-rank coal samples collected from typical low-rank coal-bearing basins and coalfields in China were performed under different temperatures and moisture-equilibrated conditions. The results showed that the Langmuir volume, which was found to be relatively low when the inertinite content was above 50% and relatively high when the vitrinite content was above 50%, was positively correlated with the maximum vitrinite reflectance and generally decreased with the increase of the equilibrium moisture content. The adsorbed gas content decreased as the temperature increased, while the relationship between methane adsorption decrement and pressure was described by logarithmic form. The in situ adsorbed gas content of low-rank coal reservoirs increased slightly or almost unchanged with the increase of the burial depth. These characteristics were quite different from those of middle- or high-rank coal reservoirs, and the calculation method for estimation of the in situ absorbed gas content was validated to be correct based on a comparative analysis between the calculated results and actual test results. Findings in this work are helpful to further understand the adsorption characteristics as well as adsorbed gas content of low-rank coal to improve the evaluation technique of the CBM reserve of low-rank coal reservoirs.
Keyword Coalbed methane (CBM) reserve
Adsorption characteristics
Adsorbed gas content
Low-rank coal
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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