Characteristics And Development And Utilization Of Shallow Geothermal Energy In Linyi City, Shandong Province

The shallow geothermal energy survey and evaluation project in Linyi is the requirement of the Fifth Plenary Session of the 18th CPC Central Committee and the provincial government to save energy and reduce emissions,and to promote the construction of ecological civilization In order to promote the development and utilization of shallow geothermal energy,promote the process of developing and utilizing new energy sources,and realize the government's goal of energy conservation and emission reduction,the investigation and evaluation of shallow geothermal energy in 15 cities?not including Jinan and Qingdao?in the province were carried out,and the demonstration project and dynamic monitoring system were built.Undertaking Unit:Shandong Lunan Institute of Geological Engineering Investigation.PROJECT START DATE:October 2015-december 2016.By collecting the existing data of engineering geology,hydrogeology and environmental geology,the project has basically ascertained the hydrogeological conditions of the working area in Linyi The data of hydrogeological parameters and recharge rate of representative Aquifer are obtained.The recharge rate of quaternary aquifer is between 34%and 79%,and that of limestone aquifer is 100%.Field thermal response tests were carried out in the study area and thermal physical parameters were tested in the laboratory with undisturbed rock and soil samples The comprehensive thermal parameters of Borehole,thermal conductivity,specific heat capacity,thermal diffusivity and other thermodynamic parameters of main rock and soil layers in the representative regions of Linyi are obtained.The thermal conductivity of each rock and soil in Linyi is between 1.307 and 2.489 W/m·°C,the average value is 1.798 W/m·°C,the initial ground temperature of the hole is between 16.17 and 20.49°C,and the thermal diffusivity is between 0.865 and3.116910^-6m²/s.Based on the analysis and study of geological,drilling and thermal properties of Rock and soil,the occurrence characteristics of shallow geothermal energy in Linyi are summarized The suitability zoning evaluation systems of ground water heat pump and ground-pipe heat pump systems are established respectively,and the suitability zoning is integrated accordingly.On the basis of adaptive zoning and combining the research results with the present situation of shallow geothermal energy development and utilization in Linyi,the suitable principles,directions and schemes of development and utilization in this area are put forward.The purpose is to provide reference for the development,utilization and protection of shallow geothermal energy in Linyi.