## 3 Results and Analysis
### Geological Structure Characteristics  
As shown in Figure 4, the main lithology of around Shangtang hotspring outcropping site was greissic medium grain biotite potash feldspar granite unit (Pt\({}_{2}\)H\({}^{1}\)\(\xi\)), with an area of about 10 km\({}^{2}\). The intrusions all extended along the direction of regional structural line in a very irregular long belt, and the internal contact of the sequence was not clear. The intrusions appeared intrusion relationship with around Taihua Group, early Proterozoic sibbanhe gneiss, and Mesoproterozoic penggou unit. There were strong contact metamorphism around the rock mass, mainly tremolite, chloritization, and epidotization. The second unit also had epidotization and chloritization internal alteration. The ground surface of hot spring outcropped was covered by quaternary silty clay and sand gravel layer, and the thickness of quaternary exposed by drilling was 4.2 m. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Serial No. of Well** & **Water Level (m)** & **Q (m\({}^{3}\)/h)** & **q (m\({}^{3}\)/h\(\cdot\)m)** & **t (\({}^{\circ}\)C)** & **Daily Water Output (m\({}^{3}\)/d)** \\ \hline
1 & 15.0 & 184.3 & 12.2 & 61.0 & \\
2 & 14.0 & 73.1 & 5.22 & 61.0 & \\
3 & 11.2 & 23.0 & 2.05 & 61.0 & \\ Total water output & & 280.4 & & & 6731.0 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Data of combined pumping tests of Shangtang geothermal field. Shangtang hotspring is 820 m away from Checun-Xiatang fault (F1-1) in the north and 3100 m away from Erlangmiao-Wentang fault in the south. A slightly larger Fangchehuai fault (F3-1) is 500 m to the east of the hot spring, and a north-east fault dense belt is 500 m to the northwest. Sha River develops along the fault dense belt in this area, and the belt appears a Northeast-Southwest direction. As shown in Figure 5, there are 5 NE and 3 NW faults in the geothermal area, with a NE fault distance of 30-60 m and a NW fault distant 60-130 m. Shangtang geothermal field is distributed at the intersection of NE fault F3 and NW fault F7 and F8. In the south of Shangtang, fluorite vein filled along the fault can be seen in the south of the mountain. These faults cut the rocks in Shangtang area into rhombus or wedge-shaped blocks. Five NE faults form broom structure, converging in NE direction and spreading in SW direction. In the south-west end of fault F3, the fault inclines to the southeast with an angle of about 70\({}^{\circ}\). The fractures near the hanging wall develop parallel to the fault plane, and the footwall is broom-style fractures. The fractures converge at the fault plane and spread out away from the fault plane. No. 3 hotspring overflows right from the broom-style fracture. Shangtang hotspring is mainly outcropped between fault F1-F5, which shows that Shangtang hotspring is mainly controlled by the north-east broom-style fracture structure, and the north-west fracture plays the role of connecting the north-east fracture and enriching the underground hot water. Figure 4: Geological structure of Shangtang geothermal field. The collected drilling data (Table 3) shows the strata: 21-23.0 m is fault breccia; 23-55.0 m is fault zone, rock is broken and fracture is developed; 57.7-61.9 m is rock fracture zone and fracture is developed; 65.4-67.4m is fault breccia and fracture development. The rock cores of other strata are relatively complete, and the fractures are not very developed. In the 23-50 m layer, the artesian flow increases rapidly, which indicates that the rock in this layer has strong water permeability and water storage, and the water conductivity coefficient is 342.7 m\({}^{2}\)/d. This layer is the main geothermal water aquifer in Shangtang geothermal area.