| Abstract |
The conventional installed geothermal power capacity of Türkiye is 1,734 MWe as of April 2025. The conventional geothermal potential is widely regarded as 4,500 MWe. On the other hand, some EGS estimates predict that available power is more than 250,000 MWe and 15,000 to 25,000 MWe of this potential can easily be realized. In this study, we performed a detailed comparative CO2 and water based thermohydraulic (TH) EGS modeling of the Bozköy geothermal field, the hottest recorded geothermal field in Cappadocia Region of the Central Türkiye. A private company officially reported maximum recorded temperatures of 295 ⁰C and 341 ⁰C in two economically unproductive deep geothermal wells. The well depths are 3,850 m and 3,957 m, respectively. During the field studies, some rock samples were collected from the target levels of the potential reservoir. In the laboratory, we measured their porosity, density, specific heat capacity and thermal conductivity. We then applied temperature and pressure corrections to the measured data based on the reservoir conditions and used them as input during modeling. Here we compare power output based on flow rates of 100, 125 and 150 l/s for a period of 20 years. We also ran a set of additional simulations for parametric study using 18 different parameters and compared their results. Our simulations suggest always higher CO2 production temperatures compared to water, while water allows always higher power production outputs. |