Resources Prospecting And Analysis For The New Hot Springs And Design Of Geothermal Wells In Conghua Guangzhou

This study is about low-temperature geothermal field of Conghua, Guangdong Provi- nce . By collecting data of geothermal exploration of geothermal field and previous studies, geochemical, geophysical survey, drilling, and based on the analysis of the regional geological conditions and hydrogeological conditions of the geothermal field, to evaluate the geothermal reserves and research the geothermal water flow model, and give the anomaly thermal regional and development programs.The Guang-Cong fault, the main fault of the zone through the whole region, control the conductive heat. It plays the role of communication the heat in deep, where provides the heat to formed the hot water. That is a prerequisite of the formati- on of hot water in this area. The NW faults appear in groups. When they cut with the main NE fault, the rocks crush and the fissures develop. The hot water along the main fault migrates upward and accumulates. The faults provide hot water a migration pathway and good space to store. The thermal cover is Quaternary alluvium and granite .The spa has 10 geothermal wells, of which water temperature is 36-54℃. The hot water is colorless, odorless, transparent and weak alkaline, while the pH value is 7.1-7.4. The water type is HCO₃-K·Na. The salinity is 0.24 -0.37 g/L. The thermal water is rich in F(8.5mg/L), SiO₂(30-85 mg/L)and Rn(4.7-53.4 mohair).The thermal water belongs to weak to medium level radioactive water.permeability is calculated of 0.569 3.078 m/d, an average of 1.96 m/d. Radius of influence and reduction coefficient quite different in different wells, indicating that the water conductivity of the faults zone is uneven and the occurrence form of thermal water is irregular .The C + D class storage of the original hot spring area is 6617 m³ / d. The geothermal field energy is 6.64MW. The hot spring area is a small low-temperature geothermal field. Consider that the current actual water consumption is 3000-3500 m3 / d and the C-class storage is 4015 m³ / d, with water consumption increases, there will be a hot mineral water shortage situation. So the exploration and development of new hot water wells work should be carried out. By effective combination of the magnetic method, which reveals three magnetic anomaly zone, radon method, which reveals eight high-value anomalies and transient electromagnetic geophysical method, which reveals 12 high and low resistance anomaly zone, the region is delineated six faults location. By shallow drilling, granite bedrock fracture zone is verified. By observing the temperature, temperature abnormal area of Tangliao and Mibu isapproximately 0.24 km² and 0.18 km² separately.