Abstract:

According to the chemical composition of thermal water from well DR2005 located at the Dujiazhuang geothermal field in the south of Xining,Qinghai, the groundwater recharge, age and geothermal resource potential of the thermal water are discussed by the use of Langelier-Ludwig diagram, isotopic hydrology and geothermometer methods. These results show that geothermal water from Dujiazhuang geothermal field is meteoric origin, and has modern water recharge. Based on geothermometer, the temperature of Dujiazhuang geothermal field is far higher than that of well DR2005. Hydrochemical variation of the thermal water at the area with the same geological structure suggests that the water has a trend towards bicarbonate water. The above results provide the hydrogeochemical evidence for geothermal field exploitation of Dujiazhuang.

Key words: Dujiazhuang geothermal field, geothermal resource, hydrochemical characteristic, Xining, Qinghai