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Three-dimensional electrical structure model of the Yangbajain geothermal field in Tibet:Evidence obtained from magnetotelluric data

引用

Science China Earth Sciences 2023年第8期66卷 1839-1852页

作者： Guoqiang XUE Weiying CHEN Ping ZHAO Wangqi REN Yiming HE Pengfei LV Kangxin LEI Yang ZHAO Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China

The Yangbajain Geothermal Field in Tibet is located in the fault subsidence basin of the central Yadong-Gulu Rift *** spatial distribution of the field is controlled by mountain-front fault zones on the northwestern and southeastern sides of the *** power has been generated in Yangbajain for more than 40 ***,owing to the lack of threedimensional(3D) geophysical exploration data,key geological issues related to the partial melt body of the Yangbajain Geothermal Field,such as its location,burial depth,and geometric form,as well as the ascending channel of the geothermal fluid,have for a long time been *** this study,3D inversion was performed using measured geo-electromagnetic total impedance tensor data from 47 survey *** extracted horizontal sections at different depths and profiles,and at different lines,reflect the 3D electrical structure model of the geothermal field in the study ***,three findings were ***,the partial melt body,located below the China-Nepal Highway extending along the northeast direction,is the heat source of the Yangbajain Geothermal *** burial depth range of the molten body was determined to range between approximately 6.2 and 14 ***,the geothermal fluid ascended a horn-shaped circulation channel with an up-facing opening,located in the northern section of the sulfur ditch *** study results revealed that deep rock fissures(>2 km) were not well developed and had poor *** addition,no layered heat reservoirs with high water richness were observed in the northern part of the study ***,the application of enhanced geothermal system(EGS) technology in the northern region would be essential to improving the power generation capacity of the Yangbajain Geothermal *** addition,the study found no deep high-temperature heat storage areas in the southern region of the study area.

关键词： Geothermal field Magnetotelluric Partial melt body 3D electrical structure thermal reservoir geological model

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