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首页> 外文会议>Geothermal Resources Council Annual Meeting >Application of 3D Inversion to Magnetotelluric Data in the Ogiri Geothermal Area, Japan
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Application of 3D Inversion to Magnetotelluric Data in the Ogiri Geothermal Area, Japan

机译：3D反转在日本Ogiri地热区域在Magnetelluric数据中的应用

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A stable inversion technique has been developed for three-dimensional (3D) interpretation of magnetotelluric (MT) data. The inversion method is based on the Gauss-Newton (linearized least-squares) method with smoothness regularization. Static shifts are also treated as unknown parameters in the inversion. The forward modeling is done by using the staggered-grid finite difference method. A Bayesian criterion ABIC is applied to searching for the optimum trade-off among the minimization of the data misfit, model roughness and static shifts. The inversion method was then applied to a large volume MT dataset obtained in the Ogiri geothermal area, southwestern Japan. The inversion was performed stably, resulting in a good fitting between the observed and computed apparent resistivities and phases. The recovered 3D resistivity structure is generally similar to the two-dimensional (2D) inversion models, although the deeper portion of the 3D model seems to be more realistic than that of the 2D model. The 3D model is also in a good agreement with the geological model of the geothermal reservoirs. These results indicate the necessity of the 3D interpretation for geothermal exploration and other application in complicated geological environments.
机译：已经开发了稳定的反转技术，用于磁通科（MT）数据的三维（3D）解释。反转方法基于具有平滑正则化的高斯 - 牛顿（线性化最小二乘）方法。静态移位也被视为反转中的未知参数。通过使用交错栅有限差分方法完成前向建模。贝叶斯标准轴归应用于在最小化数据不足，模型粗糙度和静态移位的最小化中寻找最佳折衷。然后将反转方法应用于日本西南部的Ogiri地热区域获得的大容量MT数据集。稳定性地进行反转，导致观察到的和计算的表观电阻和相之间的良好配合。恢复的3D电阻率结构通常类似于二维（2D）反转模型，尽管3D模型的更深部分似乎比2D模型更真实。 3D模型也与地热储层的地质模型一致。这些结果表明了对复杂地质环境中的地热勘探和其他应用的3D解释的必要性。

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