1�� Tianjin Geothermal Exploration and Development-Designning Instutite��Tianjin 300250��China; 2�� Tianjin Geological Engineering Investigation Institute��Tianjin 300191��China

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��