Geothermal Resource Evaluation And Numerical Simulation Research Of Convective Type Geothermal Area

With the increasing shortage of oil,coal and other traditional energy sources and the increasing pressure of environmental pollution caused by the exploitation and utilization of oil and coal,solar energy,wind energy,geothermal energy and other new energy sources have become the focus of the world's energy research.Among them,the development and utilization of geothermal energy is the most extensive and research.Wulongkou geothermal area is located in the north of the Jiyuan city,Wu Longkou town,Sheng zhuang village,The geothermal origin is under Pan Gusi fault zone's and Wu Longkou fault zone's and F25 fault's control.Geothermal type is convection type geothermal.In this paper,Wu Longkou geothermal area as the study area,By analyzing the geological structure,drilling and hydro geochemical data,the genesis of geothermal area is determined.The study area is mainly tectonic fault zone and the five Temple of Longkou fault belt and the fault F25.The main structure of the study area is Pan Gusi fault zone and Wu Longkou fault zone and F25 fault,geothermal water in the northern mountainous area of Pan Gusi fault zone accept atmospheric precipitation recharge,along the F21,F22 fault zone to the south runoff,at the intersection of F17 and F25 faults,the surface of the water is collected,formed Wu Longkou geothermal area.Geothermal area mainly mining heat reservoir is Ordovician – Cambrian thermal reservoir.Study of geothermal heat boundary conditions of reservoir,buried depth,thermal reservoir characteristics,geothermal field and geothermal water flow field,application heat storage method,calculation of geothermal resources in Wu Longkou geothermal area in the range of 1.09km2 and recoverable geothermal resources.The results are: Geothermal fluid volume is 1.01×108m3,Geothermal resources is 12312.14×1012J,Recoverable geothermal resources is 37.91×1012J/a.On the basis of fully considering the geothermal formation and geological structure,Using MODFLOW to conceptualize the model,set up 5.32 km2 calculation area within the scope of the 3-d visualization of geological model and numerical model of geothermal fluid.The parameter setting is determined according to the pumping test data and the empirical value.Simulation of the observation hole in the geothermal area.To forecast the underground water level and the hot water temperature of the geothermal area.The results show that in the mining conditions,three years after the geothermal groundwater level drops about 1-2 m deep,a mining center has formed a funnel trend;geothermal area after 100 a decreased and varied from 0.33×10-2 km2/a.The model can better reflect the actual geological conditions and hydrogeological conditions of the thermal reservoir.The underground hot water resources in the study area have the use value,but it should pay attention to the amount of exploitation in the mining,in order to realize the sustainable utilization of geothermal resources.