Study on in-situ microbial methanogenesis of CO2 and in-situ inhibition of H2S and increase of coalbed methane production in low-quality coalbed methane of the Southern Junggar Basin

作     者：Su, Xianbo Ding, Rui Zhao, Weizhong Yan, Detian Li, Ruiming Wang, Yibing Wang, Haichao Huang, Shenghai Zhou, Yixuan Wang, Xiaoming Fu, Haijiao 

作者机构：School of Resources and Environment Henan Polytechnic University Jiaozuo454000 China Unconventional gas research institute Henan Polytechnic University Jiaozuo454000 China School of Energy Resources China University of Geosciences Wuhan430074 China Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region Jiaozuo454000 China Xinjiang Coal Field Geology Bureau Urumqi830091 China Co. Ltd. Urumqi830011 China School of Geological and Mining Engineering Xinjiang University Urumqi830047 China Co. Ltd. Urumqi830011 China 

出 版 物：《Meitan Xuebao/Journal of the China Coal Society》 (Meitan Xuebao)

年 卷 期：2025年第50卷第1期

页      面：532-545页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0709[理学-地质学] 0819[工学-矿业工程] 0817[工学-化学工程与技术] 08[工学] 081501[工学-水文学及水资源] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0703[理学-化学] 082002[工学-油气田开发工程] 

基　　金：国家自然科学基金重点资助项目(42230804) 河南省重点研发专项(231111320600) 中国博士后科学基金(2023M741045) 国家资助博士后研究人员计划C档资助(GZC20230706) 

主　　题：Coal deposits 

摘      要：The development and utilization of coalbed methane (CBM) not only ensures national energy security, but also provides a boost to carbon neutrality. The southern edge of the Junggar Basin is a major CBM resource area and a key development hotspot in China. However, the region has few high-yield wells, and maintaining stable production is challenging. There is an urgent need for a technology that can increase the production of CBM resources within the control range of a single well. Additionally, high volume fractions of CO2 and H2S have become common in the CBM of this region, creating an urgent need for in-situ disposal technology for these gases. Coalbed gas bioengineering offers a promising technology for enhancing both the quality and production of CBM in this region. On-site monitoring and laboratory simulation experiments indicate that the CO2 volume fraction is closely linked to reservoir temperature. Acid-producing fermentative bacteria and Hydrogen-producing acetic acid bacteria remain active and continue to produce CO2 across a broad range of reservoir temperatures. At lower reservoir temperatures, the metabolism of hydrogenotrophic methanogens is weak and CO2 is difficult to be reduced, which is the main reason for the high CO2 volume fraction in this area. It was also found that the microbial community in the groundwater interacts with organic matter and SO24− during migration. H2S is generated when the groundwater recharge and drainage rates are consistent with the metabolic cycle of methanogens, which is called epigenetic H2S. The presence of these two acidic gases not only compromises production safety but also significantly reduces the quality of CBM. This study introduces a key technology for in-situ microbial-mediated enhancement of CBM quality and production, addressing the issue of low-quality CBM in southern Junggar Basin. The necessity and feasibility of this technology are discussed, highlighting its potential to enhance CBM production, facilit