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标题：Mixing of geothermal and non-geothermal fluids in shallow aquifers in the Germencik-Nazilli area, Büyük Menderes Basin (SW Turkey)
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作者：Ali Bülbül
期刊名称：Geodinamica Acta
印刷版ISSN：0985-3111
电子版ISSN：1778-3593
出版年度：2015
卷号：27
期号：1
页码：67-81
DOI：10.1080/09853111.2014.979529
语种：English
出版社：Taylor & Francis Group
摘要：This study observes groundwater hydrochemical characteristics during mixing between geothermal and non-geothermal fluids in Germencik–Nazilli area in the Büyük Menderes Basin (SW Turkey). Hydrogeochemical features of 32 non-geothermal, geothermal and surface samples were studied. The mean temperatures of the geothermal reservoirs are calculated to be 150–240 °C in Germencik field, based on Na-K-Mg geothermometry. Hydrochemical characteristics of Germencik geothermal fluid differ from non-geothermal fluids, mainly Na-Cl-HCO3-type geothermal fluid, while non-geothermal fluid is mostly Ca-Mg-HCO3-SO4 type. High contents of some minor elements in geothermal fluids are most likely sourced from prolonged water-rock interaction, reflecting the signals of flow paths and residence times. A mass-balance approach was used to calculate mixing ratios between geothermal and non-geothermal fluids based on B, Cl and Na concentrations. Germencik field is considerably characterised by rising geothermal fluids and overlying non-geothermal fluids. The amount of water stored in the Quaternary aquifer evolved from a deep thermal source is low in Germencik (.5–40% geothermal fluid in non-geothermal wells). Mixing between geothermal and non-geothermal fluids has been caused by groundwater utilisation practices and is increased close to active faults. Irrigation of the shallow groundwater composition is considered as influx of low-temperature geothermal fluid.
关键词：Büyük Menderes Basin; geothermal fluid; alluvial aquifer; mixing trend; SW Turkey