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Evaluation of the Geothermal Resources of Esenyurt District (Istanbul)

2023; Springer International Publishing; Linguagem: Inglês

10.1007/978-3-031-43169-2_32

2522-8722

Ali Malik GÖZÜBOL, Murat Beren, Hakan Hoşgörmez, Doğacan Özcan,

Groundwater and Isotope Geochemistry

Esenyurt District of Istanbul Province is one of the important locations of the region in terms of geothermal energy potential. In this context, a geothermal resource determination study was carried out to increase the site’s geological and hydrogeological knowledge. As a result of geological investigations, in the Paleozoic sequence, the effect of the North Anatolian Fault zone existed in all periods. NE-SW directional compressions have folded basement rocks. Especially terrestrial and lagoon sediments deposited in the region, where the basin was formed in the upper Miocene, have been folded and fractured due to the deformations of the North Anatolian Fault Zone. The claystone levels in the flood plain and lacustrine deposits show adequate cap rock features at the strata. The Eocene limestones are determined as reservoir rocks of the field according to these geological characteristics. The low temperature, flow rate, and chemical composition changes of the fluid revealed that the field has a low enthalpy and a long water circulation period due to characteristics of faults and fractures. In the study area, data from two wells were evaluated for the two geothermal fields named Kıraç and Saadetdere. For the Beytepe thermal well drilled in the Kıraç region, the flow rate has been measured as 6 lt/s with a temperature of 35 °C. The pH value has been determined as 7.49, and the EC value has been measured as 7680 μS/cm. The class of the water is NaCl. The total dissolved solid value is 4527.940 mg/L. The depth of the Saadetdere well of only the Saadetdere field was 1200 m. The fluid temperature has been measured as 49 °C, and the flow rate has been determined as 15 lt/s. The total dissolved solid value of the fluid has been 37,248 mg/L. The class of the water is also NaCl. As a result of the geological, geophysical, and hydrogeochemical studies executed within the scope of this study, two new geothermal fields have been discovered in the Esenyurt district.