Distribution of microorganisms in the typical geothermal field environment and its significance for geothermal exploration
ZHENG Xu-Ying1(), XU Ke-Wei1(), GU Lei1, WANG Guo-Jian1, LI Guang-Zhi1, GUO Jia-Qi1, ZOU Yu1, BORJIGIN Tenger2
1. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214126, China 2. Oil & Gas Resources Survey, China Geological Survey, Beijing 100083, China
As a kind of clean energy, geothermal energy has attracted the attention of scholars all over the world in recent years. Previous geochemical exploration methods for geothermal resources are limited to the analysis of individual geochemical indices. Moreover, previous studies of microorganisms in geothermal fields mostly focus on hot spring outcrops, lacking ecological studies of geothermal resources in complex terrains. This study investigated the soil geochemistry and microbial diversity of the Bantang Hot Spring geothermal field in Chaohu, Anhui Province. Geochemical indices such as head-space gas, soil gas, acid-hydrolyzed hydrocarbons, and altered carbonate were detected in this study. Combined with the microbial high-throughput sequencing technology, this study analyzed the composition and spatial-temporal distribution of the microbial population above the geothermal fields in uplifted mountains and the relationship between these bioinformatics characteristics and the geochemical indices. The results indicate that the acid-hydrolyzed hydrocarbons on the surface of the geothermal field showed a maximum methane concentration of 43.7 μL/kg in the area between faults F2 and F3, adequately reflecting the fault location of the geothermal field.Bacillaceae, Hydrogenophilaceae, and Thermodesulfovibrionaceae in the geothermal field and the background area showed large relative abundance differences, which were 0.178%, 0.108%, and 0.060%, respectively. This result indicates that they are sensitive to geothermal resources and correspond well to geochemical indices above the known geothermal field. This study preliminarily investigated the diversity of geothermal microorganisms in the geothermal field and analyzed the corresponding relationships between microbial distribution characteristics and geochemical indexes, providing technical support for the microbiological exploration of geothermal resources.
郑旭莹, 许科伟, 顾磊, 王国建, 李广之, 郭嘉琪, 邹雨, 腾格尔. 典型地热田环境微生物分布特征及其勘探意义[J]. 物探与化探, 2023, 47(5): 1127-1136.
ZHENG Xu-Ying, XU Ke-Wei, GU Lei, WANG Guo-Jian, LI Guang-Zhi, GUO Jia-Qi, ZOU Yu, BORJIGIN Tenger. Distribution of microorganisms in the typical geothermal field environment and its significance for geothermal exploration. Geophysical and Geochemical Exploration, 2023, 47(5): 1127-1136.
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