| Abstract |
Balçova Geothermal Field, being located 10 km western part of İzmir, Türkiye, is one of the most spectacular geothermal fields of the country. The lithology in the field, from oldest to youngest, is consisted of the Upper Cretaceous İzmir Flysch, Miocene aged Yeniköy Formation, Pliocene aged Cumaovası Volcanites, Quaternary alluvium and debris flows. By examining the structural, hydrogeological, geochemical properties of the Balçova Geothermal Field, relationship between these and geothermal potential of the field has been searched. Hot water samples have been taken from the deep wells present in the Balçova Geothermal Field. The analysis of the samples have been subjected to the computer program, Aquachem 3.70 and classified by the diagrams obtained. After examining the well-logs of several deep wells, cutting samples and well-cores have been taken from the appropriate levels and studied by the means of petrology and hydrothermal alteration. As a result; 3 zones have been determined in the field. These are; montmorillonite + kaolinite zone (100-200C), transition zone (150-200C) and chlorite + illite zone (200-250C), in accordance with the former shallow well alteration studies. By applying chemical geothermometers to the samples, maximum 240 degree Celsius of a temperature is obtained. In consideration of all these studies, possible geothermal boundary, possible maximum temperature and extension of the geothermal field have been interpreted. |