Geothermal Resource Potential Research In Central Area Of Ji Zhong Depression

Energy problems and environmental pollution are becoming increasingly prominent with the large-scale consumption of fossil fuels such as coal and petroleum.Exploiting and utilizing new environment-friendly energy sources has received increasing attention.As a clean energy source,geothermal energy is characterized by easy development,no pollution,and environmental protection.The central area of Jizhong depression is located in the middle of Jizhong depression in North China Plain.Geothermal resources in research area are widely distributed and have huge resources.Based on full investigation of geothermal conditions and geophysical features in the region,using the geothermal well temperature data we collected to draw the temperature contour maps of each reservoir.Combining the characteristics of geothermal gradient and geothermal flow,the distribution characteristics of ground temperature field in the study area were analyzed,using measured data and literature data,we analyzed heat capacity,density,porosity and other physical properties of rocks and geothermal water in various heat reservoirs in the study area.Dividing geothermal zones according to the geothermal resource zoning principle,calculating the area of each subarea,average temperature,depth and thickness of heat storage.Thermal storage method is used to calculate the thermal storage of each layer and its partitioned geothermal resources and recoverable resources.According to the geothermal resource grading evaluation method,the development potential of each heat storage zone is analyzed,and potential zones of different grades are divided,and the favorable zones for the development of geothermal resources are pointed out.Through the calculation of geothermal resources and the analysis of mining potential,the Neogene's Minghuazhen Formation and Guantao Formation in the central area of the Bozhong Depression have a shallow depth of heat storage,large water content in the formation,widespread heat storage,and low exploration costs,and are the main heat reservoir in research area.The bedrock thermal storage such as Wuweishan Formation has a high temperature,but it has a deep burial depth and high development costs.Currently,the use of bedrock geothermal resources has not yet been widely used.In the future,with the development of engineering technology,the cost of mining will be reduced.The prospects for the exploitation of bedrock heat storage are also very broad.