Research on the Genesis Model of Geothermal Resources in Thermal Storage

In this paper, the hydrogeochemical analysis method was adopted to test the underground water samples in the thermal reservoir of the Wumi Mountain Formation in detail, and the genesis pattern of geothermal resources was analyzed in depth from various perspectives of geological structure, hydrogeology, and geothermal geological conditions by synthesizing the results of the previous researches. The results show that the geothermal water in the Wumi Mountain Formation is mainly neutral or weakly alkaline brackish water, and its hydrochemistry is of the Cl∙HCO₃ -Na type. By analyzing the chemical composition of the groundwater, we found that Na⁺ and Cl^– play a decisive role in the formation of TDS, with an average TDS of 2861 mg/L. In addition, the analysis of trace components showed that the concentration of Li, Sr, F, HBO₂ and SiO₂ in the geothermal water of the Wumi Mountain Formation is significant, reflecting the strong interaction between the deep groundwater and the rocks. SiO₂ content is highly correlated with the temperature, which can be used to estimate the thermal storage temperature. In the analysis of the genesis model, this study reveals that the geothermal water in the thermal reservoir of the Wumi Mountain Formation mainly originates from the atmospheric precipitation in the Taihang Mountain area and undergoes long-distance subsurface transportation through the pre-Taihang Mountain fracture zone. This study provides a new perspective and theoretical basis for understanding and developing deep geothermal resources in Xiongan New Area.