Nearly 276 geothermal occurrences and fields are known to exist in Turkey according to MTA (the state owned directorate) records. Istanbul Technical University is conducting a study on assessment of the geothermal resources of Turkey to estimate the magnitude of geothermal resources and geothermal power production potential.

As a first step, the geothermal inventory data given by MTA, and also the data available for the fields given in the literature and as well as studied by our department in various projects are used to calculate the estimated apparent (identified) capacity. The apparent capacity was determined based on measured flow rate and temperature data of the produced fluids. Total geothermal apparent capacity was about 3700 MWt (based on a reference temperature of 20 oC). Details about this study were presented by Satman et al.(2007).

As a second step, producible electric power based on volumetric reserve estimations of 11 relatively high temperature geothermal fields were predicted by evaluating existing geological, geochemical and geophysical data. According to Monte Carlo Simulation results, these eleven fields have 453 MWe of power generation potential and 13 876 MWt of geothermal energy potential for P10. The methodology and details were presented by Serpen et al.(2008).

As a third step, the producible thermal power values of the 19 relatively medium temperature geothermal fields available for direct utilization were estimated and the results obtained are presented in this paper. Results are discussed in terms of apparent capacity, simulation results and recoverable heat resource base.

Moreover, additional work is conducted to obtain the subsurface geothermal temperature distribution of Turkey. On the basis of preliminary information, computed temperature distribution map at 500 m depth is given in this study. Finally, the results of a study on heat content based on measured temperature gradient data throughout Turkey are presented.

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