Characteristics and Genetic Mechanism of Qilitang Geothermal Field in Weihai

In order to protect the Qilitang geothermal hot spring in Weihai City, this paper discusses the elements of the Qilitang geothermal field, such as water source, heat source, geothermal field, heat accumulation model, and water and heat migration channel, through the methods of geothermal geological survey, geophysical exploration and geochemical exploration, and establishes the genetic conceptual model of the geothermal field and reveals its genetic mechanism. The research shows that: ① The chemical types of geothermal water are mainly SO₄·HCO₃−Ca·Na and HCO₃−Na·Ca type water, and the water quality dynamics are relatively stable. ② The main source of hot water recharge is meteoric water, which circulates to about 2276 m underground along the Hengkou−Yanggezhuang deep fracture and is heated to about 114.39 ℃. At the intersection of the faults, springs emerge along the fracture zone. ③ The infiltrated groundwater continuously absorbs heat from surrounding rocks during its deep migration along the fault tectonic belt. The genetic type of hot spring in geothermal field is deep circulation−convection type. ④ Jiaodong hot spring geothermal fields such as Qilitang are controlled by faults. The area of geothermal anomaly is small and the scale of geothermal field is small. Although Jiaodong hot spring geothermal has good market prospects for development, exploitation must be controlled to avoid resource exhaustion and temperature drop of hot water caused by excessive exploitation. The research results have certain guiding significance for the development and utilization of geothermal resources in Weihai area.