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  2. 地质与地球物理研究所
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  4. 中国科学院页岩气与地质工程重点实验室
Geochemistry of geothermal fluid with implications on circulation and evolution in Fengshun-Tangkeng geothermal field, South China

文献类型：期刊论文

作者Luo, Ji1,2; Li, Yiman1,3; Tian, Jiao1,4; Cheng, Yuanzhi1,3; Pang, Zhonghe1,3; Gong, Yulie5
刊名GEOTHERMICS
出版日期2022-03-01
卷号100页码:14
关键词Fengshun-Tangkeng geothermal field Water-rock interactions Recharge sources Cation exchange Mixing Dissolution of silicate minerals
ISSN号0375-6505
DOI10.1016/j.geothermics.2021.102323
英文摘要This paper aims to determine the recharge sources, geochemical evolution and secondary reactions during ascending process of geothermal fluid with wellhead temperature of 92 degrees C in the Dengwu power plant of Fengshun area through analysis of hydrogeochemical and isotopic compositions of both geothermal water and gases. Results show that geothermal water for power generation is slightly alkaline HCO3-Na type with TDS of 291-369 mg/L and it is N-2 dominated. It is originally recharged by precipitation from surrounding mountainous areas with altitude of 475-683 m and circulates in the granite reservoir for about 7 ka to 9 ka years as evidenced by C-14 and tritium dating after infiltration through faults systems of NE, NW and EW orientations. Under reservoir conditions, dissolution of silicate minerals like albite, microcline, muscovite and plagioclase leading to alkaline metal elements of K, Na, Ca and Mg and trace elements of Li, Sr and Rb releasing into the fluid. In addition, previous dissolved Ca2+ and Mg2+ by eluviations exchange with Na+ and K+ absorbed on silicate reservoir and this process greatly improved concentrations of Na+ and K+, resulting in the dominant proportions of Na+ (91.3-95.8 meq%) in the geothermal water. And dissolution of CO2 coming from air-saturated precipitation and organic matter or biogenesis promotes the water-rock interactions in granite reservoir. Helium and neon isotope analysis indicate that up to 12.2% of volatile of mantle migrate into the deep geothermal fluid through the regional scale faults system, e.g., Locus Mountain fault. During the ascending process, mixing with shallow groundwater and RongJiang River water make the geothermal water with lower temperature and TDS outflow along the NW orientated fault in forms of springs and artificial boreholes. It is speculated that the 5760 m(3)/day of geothermal fluid for power generation from fractured media of granite reservoir are mixture of original geothermal fluid in deep, shallow groundwater and Rongjiang River water.
WOS关键词HELIUM ; CARBON ; ORIGIN ; PROVINCE ; BASIN ; GAS
资助项目National Key R&D Program of China[2019YFC0604901] ; Chinese Academy of Sci-ences[Y907K21001] ; National Natural Science Foundationof China[42072328]
WOS研究方向Energy & Fuels ; Geology
语种英语
WOS记录号WOS:000783222700003
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; Chinese Academy of Sci-ences ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China ; National Natural Science Foundationof China
源URL[http://ir.iggcas.ac.cn/handle/132A11/105122]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Li, Yiman
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China
2.State Power Investment Corp Res Inst, Beijing 102209, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.China Earthquake Adm, Inst Earthquake Forecasting, Beijing 100036, Peoples R China
5.Chinese Acad Sci, Key Lab Renewable Energy, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Luo, Ji,Li, Yiman,Tian, Jiao,et al. Geochemistry of geothermal fluid with implications on circulation and evolution in Fengshun-Tangkeng geothermal field, South China[J]. GEOTHERMICS,2022,100:14.
APA Luo, Ji,Li, Yiman,Tian, Jiao,Cheng, Yuanzhi,Pang, Zhonghe,&Gong, Yulie.(2022).Geochemistry of geothermal fluid with implications on circulation and evolution in Fengshun-Tangkeng geothermal field, South China.GEOTHERMICS,100,14.
MLA Luo, Ji,et al."Geochemistry of geothermal fluid with implications on circulation and evolution in Fengshun-Tangkeng geothermal field, South China".GEOTHERMICS 100(2022):14.

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来源：地质与地球物理研究所

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