Hydrogeochemical characterization and conceptual modeling of the Edremit geothermal field (NW Turkey)

Date

2013-07-15

Author

Avşar, Özgür
Güleç, Nilgün Türkan
Parlaktuna, Mahmut

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The Edremit geothermal field, with 42-62 degrees C discharge temperatures, is utilized for space heating. Alternation of permeable and impermeable units created two superimposed aquifers in the area: an upper unconfined and a lower confined. Water samples from 21 (hot-cold) wells were taken in this study. 8 of these wells penetrate the deeper confined aquifer, while 13 penetrate the shallower unconfined aquifer. Geochemical analyses revealed that Na + K - SO4 (>40 degrees C), Ca - HCO3 (<30 degrees C) and Ca - SO4 (30-40 degrees C) waters occur. delta O-18-delta D compositions point to a meteoric origin for all waters, while C-14 analyses suggest longer subsurface residence times for the hot waters, compared to the cold/warm waters. Chemical and isotopic compositions indicate that mixing and water-rock interaction are the possible subsurface processes. When silica and cation geothermometers are evaluated together with fluid-mineral equilibria calculations, a reservoir temperature range of 92-150 degrees C is evaluated. Saturation indices do not indicate a serious potential of scaling in the field. The hydrogeology of the study area is highly affected by faults. Infiltrated meteoric water percolates (down to 4.5 km depth) via deep seated step faults, becomes heated and ascends to the surface at the low lands, especially through intersection of buried, mid-graben faults. During its ascent, geothermal water invades the two superimposed aquifers where mixing between the hot and cold waters takes place.

Subject Keywords

Geochemistry and Petrology, Geophysics

URI

https://hdl.handle.net/11511/42026

Journal

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH

DOI

https://doi.org/10.1016/j.jvolgeores.2013.05.015

Collections

Department of Geological Engineering, Article

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Geochemical evaluation and conceptual modeling of Edremit geothermal field Avşar, Özgür; Güleç, Nilgün Türkan; Parlaktuna, Mahmut; Department of Geological Engineering (2011) Edremit geothermal field with 42-62 °C discharge temperatures is utilized for space heating. Alternation of permeable and impermeable units created two superimposed aquifers in the area: upper unconfined and lower confined. Water samples from 21 (hot, warm, cold) wells were taken in this study. 8 of these wells penetrate the deeper confined, while 13 penetrate the shallower unconfined aquifer. Geochemical analysis revealed Na+K–SO4 nature for the hot (>40°C), Ca–HCO3 nature for the cold (<30°C) and Ca–SO4 n...
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Citation Formats

Ö. Avşar, N. T. Güleç, and M. Parlaktuna, “Hydrogeochemical characterization and conceptual modeling of the Edremit geothermal field (NW Turkey),” JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, pp. 68–79, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42026.