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Hydrochemical Characteristics Constraints on Evolution of Geothermal Water in Guantang Area on the East Coast of Hainan Island
Zhang Yanpeng, Li Qinghua, Yu Shaowen
PDF(4251 KB)
PDF(4251 KB)
Hydrochemical Characteristics Constraints on Evolution of Geothermal Water in Guantang Area on the East Coast of Hainan Island
The understanding of the formation and evolution of geothermal water is an important basis for the scientific and rational utilization of regional geothermal resources. In this paper, the hydrochemical characteristics, geothermal storage temperature and recharge source of geothermal water in Guantang area on the east coast of Hainan were systematically revealed by using hydrochemical and isotopic analysis methods combined with regional geological structure characteristics, and a conceptual model of geothermal water cycle evolution in Guantang area was constructed. The results show that the hydrochemistry of geothermal water was mainly HCO3·SO4-Na type, and its components mainly came from silicate mineral dissolution and deep gas components. Geothermal water was mainly originated from meteoric precipitation, and the recharge area was most likely located at the altitude of 1 122.2-1 569.4 m. There was a significant mixing effect between geothermal water and shallow groundwater. Under the condition of steam loss before mixing, the mass percentage of steam loss from geothermal water was 18.2%-25.2%, and the initial temperature of geothermal water was 190.4-217.8 ℃, and the mass percentage of cold water mixing to geothermal water was 66.8%-80.8%. The geothermal water level decreased greatly with the increasing geothermal water exploration in this area in recent decades, so the increase of shallow groundwater supply may be the crucial process resulting in the decrease of geothermal water temperature in this area.
Guantang geothermal field / geothermal water resources / hydrogeochemistry / geothermal water recharge / geothermal storage temperature / hydrogeology
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