粤西沿海高盐度中低温地热系统水化学特征及形成演化

雷云开; 王帅; 黄学莲; 林景昱; 韩永杰; 程子豪; 祁士华

doi:10.3799/dqkx.2025.108

Volume 50 Issue 9

Sep. 2025

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Lei Yunkai, Wang Shuai, Huang Xuelian, Lin Jingyu, Han Yongjie, Cheng Zihao, Qi Shihua, 2025. Hydrochemical Characteristics and Formation-Evolution Analysis of Medium-Low Temperature Geothermal Systems with High Salinity in Coastal Western Guangdong. Earth Science, 50(9): 3616-3630. doi: 10.3799/dqkx.2025.108

Citation:

Lei Yunkai, Wang Shuai, Huang Xuelian, Lin Jingyu, Han Yongjie, Cheng Zihao, Qi Shihua, 2025. Hydrochemical Characteristics and Formation-Evolution Analysis of Medium-Low Temperature Geothermal Systems with High Salinity in Coastal Western Guangdong. Earth Science, 50(9): 3616-3630. doi: 10.3799/dqkx.2025.108

Citation:

Lei Yunkai, Wang Shuai, Huang Xuelian, Lin Jingyu, Han Yongjie, Cheng Zihao, Qi Shihua, 2025. Hydrochemical Characteristics and Formation-Evolution Analysis of Medium-Low Temperature Geothermal Systems with High Salinity in Coastal Western Guangdong. Earth Science, 50(9): 3616-3630. doi: 10.3799/dqkx.2025.108

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Hydrochemical Characteristics and Formation-Evolution Analysis of Medium-Low Temperature Geothermal Systems with High Salinity in Coastal Western Guangdong

doi: 10.3799/dqkx.2025.108

Lei Yunkai^{1
,
,},
Wang Shuai^{2, 3},
Huang Xuelian^{2, 3},
Lin Jingyu⁴,
Han Yongjie¹,
Cheng Zihao¹,
Qi Shihua^{1, 4
,
,
,}

1.
State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences (Wuhan), Wuhan 430078, China
2.
School of Sustainable Energy, China University of Geosciences (Wuhan), Wuhan 430078, China
3.
State Key Laboratory of Deep Geothermal Resources, China University of Geosciences (Wuhan), Wuhan 430078, China
4.
School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan 430078, China

Received Date: 2025-03-25
Publish Date: 2025-09-25

Abstract

Abstract

Coastal geothermal systems are prone to seawater intrusion, which can increase the salinity of geothermal water, reduce its utilization efficiency, and raise operational costs. As a significant region for medium-low temperature geothermal resources in China, the coastal areas of Guangdong Province still lack systematic research on seawater intrusion into geothermal systems and its impacts. This study investigates the hydrochemical characteristics, seawater intrusion extent and formation mechanisms based on physicochemical data from 35 geothermal water samples, one cold groundwater sample and one seawater sample in western Guangdong Province. Comprehensive analyses including hydrochemistry, isotopes and multivariate graphical interpretation methods, are employed to explore these aspects. The research results indicate that coastal geothermal water exhibits visible seawater intrusion characteristics with high salinity levels, demonstrating a maximum mixing proportion reaching 41.88%. The hydrochemical types evolve from bicarbonate-type in inland areas to chloride-type in coastal zones. The geothermal water is primarily recharged by atmospheric precipitation. During the Late Pleistocene to Holocene period, infiltrated meteoric water from the Yunkai Mountain and Tianlu Mountain areas interacted with geothermal reservoir rocks at a temperature of 90-126 ℃, undergoing gradual temperature elevation. Subsequently, marine transgression events induced large-scale paleo-seawater mixing into the geothermal system, where seawater migration was accelerated by thermal convection "pumping effects". Thereafter, sustained seawater intrusion has persistently affected coastal areas, ultimately forming medium-low temperature geothermal water with high salinity characteristics.
- medium-low temperature geothermal water,
- hydrochemistry,
- seawater intrusion,
- high salinity,
- geothermal energy,
- isotopes

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References(67)

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Hydrochemical Characteristics and Formation-Evolution Analysis of Medium-Low Temperature Geothermal Systems with High Salinity in Coastal Western Guangdong

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