Since November 2007, the Sorgun geothermal field has been developed with two production wells and one reinjection well. Hot water produced from the geothermal wells is mainly used for district heating, greenhouse heating, and spa facilities. A total of 12 geothermal wells were drilled in this field to depths ranging from 90 to 444 mbgs, with measured borehole temperatures between 50 and 85.4 degrees C. During the heating period between November and May, the average rates of production and reinjection were 75 and 35I/s, respectively. During the non-heating period, the production rate decreased to 451/s and the reinjection rate to 51/s. The measured water level was 110 mbgs during the heating period and rose to 96 mbgs during the non-heating period. A conceptual model of the geothermal field was created with defined model parameters and boundary conditions. This geothermal conceptual model was analyzed using the TOUGH2 numerical simulation program. A natural state model was developed, and simulated results were computed using static temperature data for the production wells before exploitation. After a good match between the modeled and measured temperature data was achieved, the natural state model was run with production/injection flow rate and enthalpy data from 2007 to 2014 for history matching. Results of this model were calibrated with measured water level and temperature data for the observation well. A good match was achieved between the measured values and the model's predicted values. (C) 2016 Elsevier Ltd. All rights reserved.