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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Two-dimensional geoelectrical structure of the Goeynuek geothermal area, northwest Anatolia, Turkey
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Two-dimensional geoelectrical structure of the Goeynuek geothermal area, northwest Anatolia, Turkey

机译：土耳其安纳托利亚西北部Goeynuek地热区的二维地电结构

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摘要

A detailed survey with magnetotelluric measurements covering the period range 0.04-500 s was carried out to define the geoelectrical structure of Goeynuek geothermal area, northwest Anatolia. The study area is not far from the well-known geothermal field around northwest Anatolia that has several potentially valuable minerals and hot springs. The resulting two-dimensional (2-D) geoelectric structures, with true resistivity values, obtained from transverse electric (TE), transverse magnetic (TM) and joint TE-TM data inversion were interpreted by considering geological cross-sections, gravity anomaly and direct current (dc) Schlumberger vertical electrical sounding (VES) data. The 2-D models of geoelectric structures obtained from these inversions clearly display the existence of three electrically conductive (～4-6 Ω m) zones Z1, Z2 and sZ. The origin of remarkably good conductivity within the two large zones Z1 and Z2 located from the depth of about 5 km to depths of more than 15 km, and the existence of a smaller zone sZ at between 4-7 km are explained by the circulation of hydrothermal fluids with low resistivity values (0.28-0.52 Ω m) and by the effects of a strong hydrothermal alteration in the rocks. A low magnetic anomaly with low intensity of about ≤50 γ under the middle of the Goeynuek area is ascribed to the hydrothermal demagnetisation of the rocks due to geothermal activity. The sharp decrease in resistivity to very low values probably suggests that both zones Z1 and Z2 are highly permeable (porosity about 30%) and therefore saturated with underground geothermal fluids. The upper zone sZ may act as a corridor for hydrothermal circulation between both of the zones Z1 and Z2, and it is a prime target for further geothermal exploration.
机译：对大地电磁测量进行了详细的调查，其周期范围为0.04-500 s，以定义安纳托利亚西北部Goeynuek地热区的地电结构。研究区域与安纳托利亚西北部周围著名的地热田不远，那里有几种潜在有价值的矿物质和温泉。通过考虑地质横截面，重力异常和地震作用，解释了从横向电（TE），横向磁（TM）和联合TE-TM数据反演获得的具有真实电阻率值的二维（2-D）地电结构。斯伦贝谢垂直电测深（VES）数据。从这些反演获得的地电结构的二维模型清楚地显示出存在三个导电（〜4-6Ωm）区域Z1，Z2和sZ。从大约5 km的深度到超过15 km的深度的两个大区域Z1和Z2内，明显具有良好电导率的起因是通过循环作用来解释的，在4-7 km之间存在较小的区域sZ。具有低电阻率值（0.28-0.52Ωm）的热液，并受岩石中强烈的热液蚀变的影响。在Goeynuek地区中部以下的低强度低磁异常（约≤50γ）归因于地热活动使岩石发生热液退磁。电阻率急剧下降到非常低的值，可能表明Z1和Z2区都是高渗透性的（孔隙度约为30％），因此被地下地热流体饱和。上部区域sZ可以充当区域Z1和Z2之间热液循环的通道，并且是进一步进行地热勘探的主要目标。

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