Physical simulation of in-situ microbial methanation in coal reservoirs with the participation of supercritical CO₂

Authors

SU Xianbo, Unconventional Gas Research Institute, Henan Polytechnic University, Jiaozuo 454003, China; School of Energy Resources, China University of Geosciences(Wuhan), Wuhan 430074, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454003, ChinaFollow
WANG Lufei, School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China
ZHAO Weizhong, School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China
XIA Daping, School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
ZHOU Yixuan, School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
WANG Qian, School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China

Abstract

Supercritical CO₂ can destroy the molecular structure of coal and increase the production of biomethane. To investigate the gas production potential under the in-situ conditions of coal reservoirs with the participation of supercritical CO₂, the original reservoir pressure, reservoir temperature, and gas composition of the target coal seam in a coalbed methane block in Xinjiang were used as the in-situ reservoir conditions. The self-designed anaerobic fermentation device for coal reservoirs was used to simulate the in-situ anaerobic fermentation process, and the biogas production, coal surface functional groups and microbial community structure under the in-situ conditions were analyzed. The results show that under the in-situ conditions of coal reservoirs with supercritical CO₂, the biomethane production reaches 32.9 mL/g, and the CO₂ bioconversion rate is 17.44%. FTIR spectroscopy shows that the ability of microorganisms to degrade oxygen-containing groups in phenol, alcohol, ether and ester under in-situ conditions is stronger than that under the conventional anaerobic fermentation conditions. In the in-situ anaerobic fermentation system with the participation of supercritical CO₂, methanogens with multiple methanogenic metabolic pathways (hydrogenotrophic, acetic acidotrophic and methylotrophic) gradually evolved to single hydrogenotrophic methanogens. Under high pressure, the genus of Solibacillus silvestris became the dominant bacteria in the fermentation stage of hydrolysis and acid production. This article provides an experimental basis for the on-site implementation of coalbed gas bioengineering and carbon emission reduction.

Funding Information

10.12363/issn.1001-1986.21.11.0684

Keywords

in-situ conditions of coal reservoir, microbial methanation, physical simulation, anaerobic fermentation, supercritical carbon dioxide, coalbed gas bioengineering, carbon emission reduction

Recommended Citation

SU Xianbo, WANG Lufei, ZHAO Weizhong, et al. (2022) "Physical simulation of in-situ microbial methanation in coal reservoirs with the participation of supercritical CO₂," Coal Geology & Exploration: Vol. 50: Iss. 3, Article 13.
Available at: https://cge.researchcommons.org/journal/vol50/iss3/13

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