Abstract:
Decheng district is the main area of geothermal resources exploitation of sandstone thermal reservoir in northwest of Shandong Province. However, whether geothermal water exploitation will affect land subsidence has not been studied, which will directly affect the local government's decision-making and standardized management of geothermal resources exploitation. According to the theory of soil consolidation, under the same consolidation conditions and the same decrease of water level, the ratio of effective stress increment to self-weight stress of thermal reservoir is much lower than that of deep groundwater exploitation layer. Combined with the drilling data, it is considered that the thermal reservoir in this area is a semi-diagenetic state with argilllic cementation, and its compressibility is far lower than that of deep groundwater exploitation. Based on the geothermal resource exploitation policy of this area, by analyzing the existing hierarchical standard monitoring data, it is found that the influence of geothermal water exploitation on land subsidence is not significant under the current mining condition.