Discussion on the geological tectonic setting and geothermal origin in Zhouliangzhuang area of Tianjin

There is plentiful geothermal resources in Zhouliangzhuang of southern Baodi of Tianjin.In order to identify the geothermal origin and the geothermal field whether affected by fault structures,the authors performed secondary interpretationon using artificial earthquake and drilling data,and analyzed the geological tectonic setting and developing characteristics of geothermal reservoir,and discussed the geothermal origin on the basis of hydrochemistry comprehensive analysis and isotope geochemical exploration.It is concluded that the main structure in this area is an anticline,the geothermal belongs to a sedimentary basin-type layered geothermal reservoir,which has two types with good conditions,including porosity-type and bedrock fractured-type hot water systems.Being close to the supply area is the reason of low salinity in this area,and the water supply comes from atmospheric precipitation in northern mountain area.Geothermal fluid exchanged the oxygen with rich oxygen-bearing rocks in deep-cycle process and δ18O existed with the oxygen shifting in various degrees.