Abstract:Eastern area in Rizhao city has good geothermal mineralization conditions and geothermal prospecting prospects. Study on the origin and distribution of geothermal resources has important guiding significance for searching for geothermal resources. Based on distribution characteristics and occurrence rules of geothermal resource, combining with successful experiences of geothermal exploration and construction, pointing to speicial geothermal and geological conditions, by using controllable source audio magnetotelluric sounding (CSAMT), electromagnetic sounding (VES) and other methods, characteristics of fault structures and water richness in typical geothermal exploration areas in Rizhao area have been interpreted, and geothermal well positions have been determined. The origin of geothermal water has been studied through drilling construction and rock and mineral testing. It is showed that geothermal resources in the eastern granite area of Rizhao city are mainly distributed near the faults with the trend of NE, NNE and NW. It is a deepcycle convective zone geothermal resource controlled by faults, and the distribution of heat storage is mainly controlled by faults. It is appropriate to survey and fix wells at the intersection of two or more faults. The controlledsource audiofrequency magnetotelluric sounding method can clearly reflect the deep development characteristics of the faults and the water content of the fractures, which is a more suitable method for geothermal exploration and well positioning in granite area in Rizhao city. According to hydrogen and oxygen isotopes results, it is reflected that geothermal water in the study area is supplied by atmospheric precipitation, which is supplied by the nearby mountainous area. It infiltrates and circulates along the fault, and absorbs heat to form geothermal water. The cycle distance is not large.
