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首页> 外文期刊>Journal of Applied Geophysics >3-D inversion of MT data from the Sabalan geothermal field, Ardabil, Iran
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3-D inversion of MT data from the Sabalan geothermal field, Ardabil, Iran

机译：来自伊朗阿尔达比勒的Sabalan地热田的MT数据的3-D反演

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摘要

Since the true Earth is 3-D in nature, a three-dimensional (3-D) inversion has clear advantages over lower dimensional inversions. We utilized a 3-D magnetotelluric (MT) inversion code, WSINV3DMT, to obtain a realistic resistivity model using a long period MT data set collected in the Northwest Sabalan geothermal field in Ardabil, Iran. The apparent resistivity and phase curves, the magnetic induction vectors, the impedance polar diagrams and the rotational invariant of impedance tensor, indicate a complex 3-D conductivity structure. After setting up the model parameters and designing the appropriate block discretization, we performed the 3-D inversions for two sets of observed data; one set includes the full MT impedance tensor and another set contains only off-diagonal elements of the MT impedance. The final model was selected according to the relative magnitude of the data misfit and the model norm with respect to various Lagrangian multipliers. The results of this study illustrate the 3-D inversion of the off-diagonal elements of MT impedance tensor is precisely enough to explain the structures related to the geothermal source. The obtained results were compared with the results of available 2-D models and they are then interpreted using all of the geological and drilling data of the area. The main outcome of this study is the precise delineation of the geometry of geothermal source that is located at the center of the study area with a surface coverage of about 7km~2.
机译：由于真正的地球本质上是3-D的，因此三维（3-D）反演比低维反演具有明显的优势。我们利用3-D大地电磁（MT）反演代码WSINV3DMT，使用在伊朗Ardabil的西北Sabalan地热田中收集的长期MT数据集来获得真实的电阻率模型。视在电阻率和相位曲线，磁感应矢量，阻抗极坐标图和阻抗张量的旋转不变量表示复杂的3-D电导率结构。设置好模型参数并设计了适当的块离散后，我们对两组观测数据进行了3D反演。一组包含完整的MT阻抗张量，另一组仅包含MT阻抗的非对角线元素。根据数据失配的相对大小和相对于各种拉格朗日乘数的模型范数选择最终模型。这项研究的结果表明，MT阻抗张量的非对角线元素的3D反演正好足以解释与地热源有关的结构。将获得的结果与可用的二维模型的结果进行比较，然后使用该地区的所有地质和钻探数据对它们进行解释。这项研究的主要成果是精确描述位于研究区域中心，地表覆盖约7km〜2的地热源的几何形状。

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