The Study On The Basic Characteristics And Recharge Of Geopressured Geothermal Waters In Xianyang

The geothermal field of Xianyang has its own unique low-temperature, low-pressured geothermal waters. The paper is subsidized by the Shanxi Province Fund for nature《The meaning for oxyhydrogen isotope evolution about pressured geothermal waters to anciet geological environment in Xianyang》(NO.SJ08-ZT08), and the national geology Investigation Bureau Project《Geothermal water Investigation in Shanxi Guanzhong》(NO. 1212010535A98), it is launched the special research about the geopressured geothermal waters's characteristic of suppling circulation and environment in Xianyang by using the environmental isotope and hydrogeochemistry method, analyzed and summarized the geostatic pressure characteristic, the isotope characteristic and the hydrochemistry characteristic of geothermal waters in Xianyang thoroughly, and has conducted the exploring research to the Xianyang geothermal waters's source of recharge, then drew the following conclusion: Environmental isotopeδD,δ¹⁸O,δ¹³C,δ¹⁴C,δ³⁴S distributed characteristic proves the geothermal environment in north of the Xianyang Weihe River is much closer compared to the south of Xianyang Weihe River, the geothermal waters has the certain extent water power relation between the south of the XianYang Weihe River and Xi'an. The main hydrochemistry ingredient spatial distribution evolution of geothermal waters in the research area is confirmed that hydrochemistry ingredient of geothermal water assumes the north to south of the belt-shaped distribution rule, agreement in main structure (the north shore of Weihe River break), the geothermal waters about the north of the Xianyang Weihe River is Cl-Na, the south of the Xianyang Weihe River is HCO₃ - Na. The research area's isotope, the hydrochemistry, the research results of the master control structure is prompted that the geothermal waters of Xianyang mainly comes from the northwest direction. The research of the isotopes, hydrochemistry distribution evolution rules about three section plane in the northwest direction, has been provided the evidence about suppling environmental isotope in Xianyang, confirmed that the geothermal waters of Xianyang is supplied by the mospheric water before the brand-new world in the north of the Weihe Basin, it is not possible to exist "the mantle material recharging from the depth and hot circulatory system".