Akademik Veri Yönetim Sistemi
1st International conference on Mediterranean Geosciences Union, MedGU 2021, İstanbul, Türkiye, 25 - 28 Kasım 2021, ss.163-167, (Tam Metin Bildiri)
This paper covers the outcomes of hydrogeochemistry and gas geochemistry studies carried out to explore the Başiskele (Kocaeli) geothermal field. In the region that includes the Başiskele geothermal field, the strata include metamorphics belonging to the Rhodope-Pontide, Upper Cretaceous flysch, olistostrome, Middle Eocene volcanic units, Pliocene sedimentary rocks, and Quaternary alluvial deposits, respectively. Many faults and associated geothermal resources within the active North Anatolian Fault Zone have been documented in the literature. In situ radon and soil gas measurements have been made using the sniffing method to detect one of these active faults within this study. Maps created according to the soil gas measurements revealed the active fault zones and locations with geothermal potential. Geophysical studies were focused on these high-potential locations and increased the number of measurements. Çiğdem 1 well-drilled in the study area has shown that the marbles, calcschists, and quartzites belonging to the metamorphics starting after a depth of 830 m gained secondary permeability with fractures. Thus, these units formed the reservoir rocks of the system. According to the Piper and Schöller diagrams, the system’s water is in the Na-Cl water class. Chemical analysis results of the water sample were evaluated in the Giggenbach Na–K–Mg diagram to use cation geothermometers to determine the reservoir temperatures. Giggenbach diagram shows that Çiğdem 1 well sample is in the class of waters that are in full equilibrium (mature). The reservoir temperature was calculated with the Na–K thermometer, and it was determined that the calculated temperatures vary between 68.64, and 73.42 °C. The water sample taken at 57 °C from the well has a pH value of 9.1. Based on the hydrochemical features and amounts of prominent elements in water, it has been recommended that this resource be used in balneological and hydrothermal therapy.