Study On The Occurrence Conditions And Characteristics Of Shallow Geothermal Energy In The Main Cities Of Sichuan Province

This paper is mainly base on the data and information that collected from the project of Shallow Geothermal Energy Investigation and Evaluation in major cities of Sichuan Province. By researching and analyzing the occurrence condition of shallow geothermal, summarizing its characteristics, we get reference for the utilization and protection of shallow geothermal energy.The utilization of shallow geothermal energy is mainly reply on groundwater and ground-coupled heat pump system. Since the ground-coupled heat pump system has smaller impact on the environment, easy to install, it has been used more often. The heat exchange power of ground-coupled heat pump system is influenced by regional geological, hydrogeological and engineering geological conditions, rock and soil porosity, water content, density, thermal properties, temperature distribution and dynamic, temperature and depth of the constant temperature zone, etc. The above factors are referred to as occurrence condition characteristics of shallow geothermal energy.Base on the hydrogeological conditions, thermal physical characteristic of rock and soil, shallow geothermal field characteristic, and formation heat response characteristic, this paper analyzes the relationship between the occurrence condition characteristics of shallow geothermal energy and the heat exchange power of the ground-coupled heat pump system in the research areas, including the relationship between different lithology density, porosity, water content and thermal conductivity, the relationship between different lithology density, porosity, water content and specific heat capacity, the relationship between different lithology density, porosity, water content and thermal diffusivity; as well as analyzes the characteristics of underground water temperature and formation temperature in the research areas.