Geothermal potential assessment of the Kaplanlı region (Afyon) using the magnetotelluric method

Industry standards for geothermal exploration commonly rely on electromagnetic geophysical techniques. Subsurface and high temperature fluids are responsible for alteration of clays which are observed in locations with geothermal potential. These geological conditions exhibit elevated conductivity values, making EM methods viable for geothermal prospecting. This study presents the results of a magnetotelluric (MT) survey conducted in the Kaplanlı region  in Afyon, Western Anatolia, aimed at identifying geothermal potential within a structurally complex tectonic setting. A total of five MT profiles with 51 stations were acquired and subjected to two-dimensional inversion to resolve the subsurface resistivity structure. The results reveal a prominent medium-resistivity zone with a thickness of 2.5 km and at 3 km’s floor depth, interpreted as a potential geothermal reservoir. Geophysical interpretations, supported by regional tectonic analysis, suggest the presence of deep-seated magmatic intrusions acting as a heat source. The findings indicate that the Kaplanlı area within Afyon holds significant promise for geothermal exploration, and demonstrate the effectiveness of MT methods in delineating favorable reservoir conditions in extensional tectonic settings.