Evaluation of sustainability of Ziga (Aksaray)geothermal waters and thermal tourism of travertines in the field

The aim of this thesis is to enable the constitution of travertines in constructed travertineponds besides improving the existing ones in Ziga (Aksaray) geothermal field, to evaluate geothermal waters with water chemistry methods in terms of sustainability and thermal tourism, drawing protection areas,suggesting reinjection wells to remove geothermal sewagesand new drillings.The study area, interpretations are made by utilizing the previous analysis and sample surveys for water chemistry. Periodical differences are taken into consideration and predictions are made about reservoir rock temperatures.Opinions are formed about temperature variations by considering the isotope amounts of travertines settled in area. In order to understand the travertine precipitation mechanism in situ, physical parameters such as, pH, CO2 and temperatures are measured, At the end of 10 days in case study area, 1.5-2 mm tufas are observed.At the borehole exisiting in ZJA, 45,27 °C and 310,87 psigvalues are obtained in 175 meter depth with the studies done by Provincial Bank. According to these datas year based long therm production could be made at higher flow rates, but static and dynamic pressure/level values can be changed.ZJA waters have the property of being used as balneotheraphy treatment purposed.Geological studies are conducted in the area of investigation and new borehole spots are suggested on active tectonic lines found in travertine fields that arconsindred in the 1st protection area and reinjection locations are suggested as gradient bores on deep faultlines found on basin sidesKey Words: Geothermal water, Sustainability use, Travertine, Thermal tourism, Ziga, Aksaray.