Özet:

Bayatçık geothermal field is located 7 km northwest of the Afyonkarahisar city center. In this region there are 10 wells drilled by AFJET (Afyon Geothermal Facility Tourism, Industry and Trade Joint Stock Company). 8 of them are used in production and 2 of them are used as reinjection wells. The wells, with a 65°C temperature and 35 l/s flow rate, are used for the 150.000 m2 greenhouse facility and another 250.000 m2 closed area is heating in Afyon Kocatepe University ANS Campus. The aim of this study is to determine the borehole geology and hydrothermal alteration mineralogy of Bayatçik-1 well which was drilled in 2013. The well is 925 meters deep. Units of alluvium, volcanic and sedimentary sections of the Köprülü volcanosedimanter sequence, basal conglomerate, marble and schist sections were cut. The cover rocks of the geothermal system consisting of volcanic and sedimentary rocks were cut in the first 528m. At depths of 528-558 m basal conglomerate was crossed. There are marble unit (Mrb1), which is the reservoir rock of the geothermal system at depths of 558-574 m, micaschist (Sch1) between 574-622 m, marble-2 between 622-746 m (Mrb2), micaschist-2 (Sch2) between 746-830 m, marble-3 between 830-890 m (Mrb3) and finally at depths of 890-920 m is a schist unit which acts as the impermeable basement rock of the system. Mineralogical and petrographic analyzes such as stereo microscope, polarizing microscope, x-ray diffractometer (XRD) and scanning electron microscope (SEM) were applied to the clastic samples taken at 2m intervals from Bayatçik-1 well. The result of the study is aimed to reveal the development of the geothermal system in the Bayatcık region by the differences in the hydrothermal alteration mineralogy of the samples.

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