IGGCAS OpenIR  > 页岩气与地质工程院重点实验室
Geochemistry of geothermal fluid with implications on circulation and evolution in Fengshun-Tangkeng geothermal field, South China
Luo, Ji1,2; Li, Yiman1,3; Tian, Jiao1,4; Cheng, Yuanzhi1,3; Pang, Zhonghe1,3; Gong, Yulie5
2022-03-01
Source PublicationGEOTHERMICS
ISSN0375-6505
Volume100Pages:14
AbstractThis 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.
KeywordFengshun-Tangkeng geothermal field Water-rock interactions Recharge sources Cation exchange Mixing Dissolution of silicate minerals
DOI10.1016/j.geothermics.2021.102323
Funding OrganizationNational 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
WOS KeywordHELIUM ; CARBON ; ORIGIN ; PROVINCE ; BASIN ; GAS
Language英语
Funding ProjectNational Key R&D Program of China[2019YFC0604901] ; Chinese Academy of Sci-ences[Y907K21001] ; National Natural Science Foundationof China[42072328]
Funding OrganizationNational 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
WOS Research AreaEnergy & Fuels ; Geology
WOS SubjectEnergy & Fuels ; Geosciences, Multidisciplinary
WOS IDWOS:000783222700003
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105122
Collection页岩气与地质工程院重点实验室
Corresponding AuthorLi, Yiman
Affiliation1.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
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
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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