Evaluation of geothermal potential of Turkey using GIS based multi criteria analysis

Öztürk, Şafak
Geothermal energy could meet more than the world’s energy need. However, a very small amount of this energy is utilized by humanity, due to drilling and exploration costs for deep resources. Therefore, prospective studies have great importance in order to reduce the cost for exploration and utilization of geothermal energy. In this study Geographic Information System (GIS) based geothermal assessment techniques are used to determine the promising areas in Turkey. GIS is a combination of three features; operating spatial analyses, integrating geographical methods and taking advantage of the decision-making process. Publicly available geochemical data, active faults, travertines, map of Pliocene to Quaternary magmatic rocks occurrences have been analyzed and integrated by means of weighing according to Analytical Hierarchy Process (AHP). AHP is a Multi Criteria Decision Analysis (MCDA) approach, using the subjective and objective aspects of a decision process. The geological data used in the study comprises the distribution map of travertines, 1/500.000 scale map of undifferentiated Plio-Quaternary and Quaternary magmatic rocks and active fault map of Turkey. Geochemical data are used for geothermometric techniques that involve various reservoir temperature maps generated from publicly available well data. Each data set is ranked, and thematic maps are generated. The results have revealed that the favorable areas are mostly in accordance with the proven geothermal areas. This implies that the applied techniques validated. Therefore, in order to determine higher resolution geothermal potential of Turkey, further exploration and more systematic data are necessary.