Water-Rock Interaction In The Kizilcahamam Geothermal Field, Galatian Volcanic Province (Turkey)- A Modelling Study Of A Geothermal System For Reinjection Well Locations

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Journal Article: Water-Rock Interaction In The Kizilcahamam Geothermal Field, Galatian Volcanic Province (Turkey)- A Modelling Study Of A Geothermal System For Reinjection Well Locations

Abstract
The KIzIlcahamam geothermal field is emplaced in Tertiary-aged volcanic units 70 km NW of Ankara (Turkey). Data for this low-temperature (74-86°C) geothermal field regarding the fracture zone system were obtained from surface manifestations (hot springs, alteration zones), five exploration wells (MTA-2, -3, -4, -5, -6) and two production wells (KHD-1, MTA-1). The KIzIlcahamam reservoir developed along the KIzIlcahamam fault zone and so the production wells (180-1556 m) effect each other due to their limited separation. Meteoric water enters from a recharge area NE of KIzIlcahamam, circulates and gains heat through the fault zone, and discharges to the surface. Detailed petrographical studies have been carried out with samples taken from surface rocks, cores, and cuttings from three wells (KHD-1, MTA-2, -3). X-ray diffraction techniques were also used in the present study. Kaolinite and montmorillonite zones were identified at outcrop samples. Chloritization, clay mineralization, sericitization and carbonization were determined in the ground mass of samples from wells. The observed alteration mineral assemblages indicate that KIzIlcahamam geothermal system has been cooling since the alteration minerals formed. The exploration well MTA-3 seems to be more suitable for a reinjection well than the other wells (MTA-2, -6), even if the cost of surface piping to transport the waste water to MTA-3 is higher than to another well (MTA-6).

Author 
A. I. Gevrek








Published Journal 
Journal of Volcanology and Geothermal Research, 2000





DOI 
Not Provided
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Citation

A. I. Gevrek. 2000. Water-Rock Interaction In The Kizilcahamam Geothermal Field, Galatian Volcanic Province (Turkey)- A Modelling Study Of A Geothermal System For Reinjection Well Locations. Journal of Volcanology and Geothermal Research. (!) .