Study On The Chemical Characteristics of Geothermal Water In Ji'An Area, China

In order to study the hydrogeochemical characteristics and control factors in Ji'an area, China. We collected 15 groups of samples from Ji'an area and analyzed the isotopic and hydrochemical characteristics. The results showed that the geothermal water in the study area was dominated by Na-HCO3 type water, the groundwater was dominated by HCO3-Na·Ca type, and the surface water changes from HCO3-Na·Ca to HCO3-Ca from southwest to northeast. It can be found that the evolution process of hydrochemical components is mainly controlled by rock weathering, and the formation sealing is poor. Na+, HCO3-and Sr2+ in water are origin from the weathering and dissolution of silicate. According to the stable isotope characteristics, the geothermal water in the Anfu are of meteoric origin and have a slight 18O shift. The geothermal reservoir temperature in the study area is 49.8-101.4°C, and the geothermal water circulation depth is 1502.6-1513.6m. The geothermal water rise in the study area is mixed with shallow cold water, and the mixing ratio is calculated to be 76.1%-87.5%. The results provide a basis for the evolution of water cycle in Ji'an area, which is conducive to the rational exploitation and protection of geothermal resources.