Statistical study of analyses of water from 43 samples from geothermal wells, three groundwater wells, and one sample of local rainwater along with rainwater data from the Global Net- work of Isotopes in Precipitation...Statistical study of analyses of water from 43 samples from geothermal wells, three groundwater wells, and one sample of local rainwater along with rainwater data from the Global Net- work of Isotopes in Precipitation has been used to identify the origin and evolution of geothermal water in the Niutuozhen （~f=~jg） geothermal field and estimate the renewability rate of its geothermal re- source. The results show that the geothermal waters of the Jixianian Wumishanian dolomite reservoir and the Ordovician limestone reservoir are of CI-Na type, the geothermal water of the Pliocene Minghuazben （H~/~） Formation sandstone reservoir are CI-Na type and HCO3-Na type and the groundwater of the Quaternary aquifer is HCO3-Na and HCO3-Na.Mg.Ca type. A linear relationship between silica concentration and temperature indicates that higher temperature probably enhances concentration of silica in Jixianian geothermal water. 81SO shift in Wumishanian geothermal water av- eraged 1.57%o, and was less than 1%o in the other geothermal waters. The minimum and maxi-mum 14C ages of Wumishanian geothermal wa- ter are 17 000 and 33 000 years from north to the south of the Niutuozhen geothermal field. Geo- thermal water and Quaternary groundwater belong to different groundwater systems with no hydraulic connections. Although the geothermal field receives some recharge from the Yanshan and Taihang mountains outside the northern and western boundaries of the geothermal field re- spectively, the renewability rate of geothermal water is on the scale of 10 000 years.展开更多
基金supported by the National Basic Research Program of China(No.2010CB428806)Beijing Municipal Science and Technology Project(No.D07050601510000)
文摘Statistical study of analyses of water from 43 samples from geothermal wells, three groundwater wells, and one sample of local rainwater along with rainwater data from the Global Net- work of Isotopes in Precipitation has been used to identify the origin and evolution of geothermal water in the Niutuozhen （~f=~jg） geothermal field and estimate the renewability rate of its geothermal re- source. The results show that the geothermal waters of the Jixianian Wumishanian dolomite reservoir and the Ordovician limestone reservoir are of CI-Na type, the geothermal water of the Pliocene Minghuazben （H~/~） Formation sandstone reservoir are CI-Na type and HCO3-Na type and the groundwater of the Quaternary aquifer is HCO3-Na and HCO3-Na.Mg.Ca type. A linear relationship between silica concentration and temperature indicates that higher temperature probably enhances concentration of silica in Jixianian geothermal water. 81SO shift in Wumishanian geothermal water av- eraged 1.57%o, and was less than 1%o in the other geothermal waters. The minimum and maxi-mum 14C ages of Wumishanian geothermal wa- ter are 17 000 and 33 000 years from north to the south of the Niutuozhen geothermal field. Geo- thermal water and Quaternary groundwater belong to different groundwater systems with no hydraulic connections. Although the geothermal field receives some recharge from the Yanshan and Taihang mountains outside the northern and western boundaries of the geothermal field re- spectively, the renewability rate of geothermal water is on the scale of 10 000 years.
