Geothermal Geology Characteristic and Origin Analysis of Shilin Basin in Yunnan Province

based on geothermal anomalies and geothermal wells of Shilin basin, the structure of geothermal reservoirs, geothermal geological characteristics and hydrochemistry of thermal groundwater are examined. Geothermal reservoir of the geothermal field is Proterozoic Sinian dolomite and dolomitic limestone. Characteristic of geothermal water runoff and geothermal field are controlled by Jiuxiang fracture and Niutoushan ancient mainland. The drillings data shows that the temperature gradient is 1.5-4.8°C/100m. Deep circulation is the main origin of geothermal water. The chemical type of geothermal water is HCO3-Ca, and high silicic acid content. The geothermal water supply is limited from the hydrogeological conditions; we should control the development and utilization.