Geothermal Potential and Circulation Depth of Hudai Thermal Springs (Sandikli-Afyonkarahisar, Turkiye) Using Magnetic, Geothermometry and Heat Flow Data

The Hudai-Sandikli geothermal basin having 23 thermal productivity wells is a significant geothermal energy source field. The analysis of power spectrum, conventional heat flow and silica heat flow methods were implemented to identify the geothermal waters circulation depth, depth to Curie point and surface heat flow rate in the Hudai-Sandikli geothermal field. Hydrogeochemical facies of geothermal immature ancient waters having deep circulation in lower hydraulic conductive aquifers are Na-Ca-HCO3-SO4 and Na-Ca-SO4-HCO3, which is represented very high ion content because of extensive contact with rocks. The heat conduction law is employed to specify the rate of heat flow using the geothermal gradient value. The numerical results determined from silica geothermometer method, the mean heat flow density and Curie temperature depth are obtained as 103.69 mWm(-2) and 11.81 km, respectively. The study region was represented by a mean geothermal gradient of 49.18 degrees C km(-1) yielding average reservoir depths of 0.90 km. The estimated Curie temperature, heat flow, reservoir temperature values demonstrated that the region indicates significant geothermal energy potential because of the partial melting of lithospheric crust.