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首页> 外文会议>Geothermal Resources Council Annual Meeting >Mapping Upflow Zones with the Anomalous Geometry of a Shallow Conductor at the Las Tres Virgenes Geothermal Field, Mexico
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Mapping Upflow Zones with the Anomalous Geometry of a Shallow Conductor at the Las Tres Virgenes Geothermal Field, Mexico

机译：映射上流区域，在LAS TRES Virgenes GeoThermal Field，墨西哥的浅导体的异常几何形状

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The electrical resistivity structure, down to an average depth of 650 m, is determined under the Las Tres Virgenes geothermal zone from more than 100 vertical electric soundings (VES) and transient electromagnetic (TEM) soundings. The explored depths lie above the geothermal reservoir, which is located in fractured granitic rocks at a depth of 1200 m. The dominant feature in the data is a conductor associated with the regional aquifer with an average thickness of 300 m. By stitching together 1-D Occam's inversions several smooth sections are constructed. They are formed by imposing a smooth condition to the lateral variation of resistivity, by considering the shift-correction of the VES data as a variable, and by jointly interpreting the data from both geophysical methods. This procedure reduces the ambiguity in the interpretation produced by a number of perturbing sources. An anomalous zone, located at the base of the regional conductor, is identified by the increased conductor's thickness and eventual disappearance of its base. This zones is interpreted as an upflow zone where fracture permeability perturbs the impermeable rock unit that separates the shallow regional aquifer from the deep geothermal reservoir, allowing the vertical flow of geothermal fluids.
机译：在LAS TRES VIRGENES GEOTERMELES从100多于100垂直电探测（VES）和瞬态电磁（TEM）探测的情况下，电阻率结构下降到平均深度为650μm的电阻率结构。探索深度位于地热储层之上，位于骨折花岗岩岩石，深度为1200米。数据中的主导特征是与区域含水层相关联的导体，平均厚度为300米。通过拼接1-D occam的反转，构造了几个平滑部分。通过将VES数据作为变量的移位校正以及从两个地球物理方法共同解释数据，通过对电阻率的横向变化强加到电阻率的横向变化来形成它们。该过程减少了通过许多扰动来源产生的解释中的模糊性。位于区域导体底部的异常区，通过增加的导体的厚度和最终消失的基础。该区域被解释为溢出区域，其中断裂渗透率渗透到不透水岩石单元，该岩石单元将浅地区域含水层与深层地热储层分离，允许地热流体的垂直流动。

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