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Characteristics of Geothermal Geology of the Gulu Geothermal Field in Tibet
Gao Honglei, Hu Zhihua, Wan Hanping, Hao Weilin, Zhang Song, Liang Xiao
PDF(16532 KB)
PDF(16532 KB)
Characteristics of Geothermal Geology of the Gulu Geothermal Field in Tibet
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The Gulu geothermal field successfully revealed high temperature thermal reservoir of 189.2 °C in 2020, therefore, studying geothermal geological characteristics of the Gulu geothermal field can be significant for guiding geothermal development and helpful for revealing the high temperature geothermal system mechanism. Based on the structural geological survey, combined with the latest geophysical, drilling, and hydrological data, this paper summarizes the structural thermal control laws of the Gulu geothermal field by analyzing the internal connection of the structure-water-thermal cycle system, and establishes a conceptual model of the geothermal system. The faults of the Gulu geothermal field can be divided into 3 groups: N-S trending (F1, F3), E-W trending (F2, F4) and NE trending. Atmospheric precipitation and iceberg meltwater migrated deep along the Jiuzila-Sangxiong fault, and were heated by deep heat sources to form high-temperature geothermal fluids, and rose along the F1 fault at the edge of the basin. The hot water was blocked by the F2 and F4 faults near surface, converging into thermal reservoir, migrating and draining along the channel system which formed by the N-S and NE faults; The conglomerate cemented by sinter overlying the basement granite played a role in ensuring water and thermal insulation for thermal reservoir. The Quaternary sediments were very thin in geothermal field, and the thermal reservoir was mainly stored in the bedrock fissures. According to the results, the “Y”-shaped fault system formed by F1 and F3 faults is the main storage place for thermal reservoir, and these two faults can be regarded as the main target for deep geothermal exploration.
Gulu / geothermal field / geothermal power generation / conceptual model / bedrock fractured thermal reservoir
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感谢两位匿名审稿人和编委所提的建设性意见！
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