| Title | Conceptual Modelling of Pertek (Tunceli) Geothermal Field, Eastern Turkey |
|---|---|
| Authors | Tugbanur OZEN BALABAN, Ozlem OZTEKIN OKAN, Taylan SANCAR, Ayten OZTUFEKCI ONAL |
| Year | 2020 |
| Conference | World Geothermal Congress |
| Keywords | Pertek, modelling, hydrogeology, hydrochemistry, isotope geochemistry |
| Abstract | The study area is located in Pertek town (Tunceli) in Eastern Anatolia. The geology of the studied area is very important for the geodynamic evolution of the Eastern Taurus. The purpose of this study is to determine hydrogeochemical and conceptual modelling of the Pertek geothermal system. The reservoir rock of the geothermal system in the study area is the crystallized limestones and marbles of the Keban Metamorphics. The sedimentary units of Kırkgeçit and Karabakır formations act as impermeable barrier rocks. Moreover, alluvium is the most important and favorable unit for cold groundwater production. Geothermal resources in the Eastern Anatolia region are generally located at or near the intersection points of East and North Anatolian fault lines due to volcanic and tectonic activities. Pertek geothermal area has been developed under the control of fault lines formed by the interaction of these faults between North Anatolian Fault and East Anatolian Fault. There are several thermal springs with low temperatures (35–37°C) are with a discharge of 3 L/s in the geothermal area. Most of wells are 250 m at shallow depths. The temperatures in the wells vary between 35 and 40ºC and the discharge from 10 to 30 L/s. The thermal waters can be identified as Ca-Mg-HCO3, The cold water are Ca-Mg-Na-HCO3. Isotopic composition suggest that the thermal waters are of meteoric origin. The reservoir temperatures are calculated with several geothermometers as 110-120 °C. Geochemical, hydrogeochemical and isotopic studies indicate that the thermal waters are rised from the geothermal reservoir by the faults and mix with groundwaters coming from the cold water aquifer before surfacing. |