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受勘探成本和工区环境等因素的影响,当前大多数大地电磁实际工作采取布置稀疏测线采集数据和使用二维反演方法解释这些稀疏测线数据的方式。然而,二维反演方法在解释三维地电构造数据时存在局限性,有时甚至做出错误的地质解释。本文尝试了使用三维反演方法对大地电磁稀疏测线数据进行反演解释。使用大地电磁全信息资料三维共轭梯度反演程序对理论模型合成稀疏测线数据进行了三维反演。结果表明:这种反演方案是可行与有效的。同时,我们发现在不同数据的三维反演结果中,四个张量阻抗元素和两个倾子数据同时反演的结果相对更为准确,更接近理论模型。
Affected by the exploration cost and the environment in the work area, most of the current actual work of the earth magnetism adopts the method of arranging sparse survey data and using two-dimensional inversion method to interpret these sparse survey data. However, 2D inversion methods have limitations in interpreting 3D geoelectric data and sometimes even wrong geologic interpretations. This paper attempts to use the three-dimensional inversion method to interpret the geomagnetic EM data. The three-dimensional inversion of the synthetic sparse survey data of the theoretical model was carried out by using the three-dimensional conjugate gradient inversion program of all-terrestrial electromagnetic data. The results show that this inversion scheme is feasible and effective. At the same time, we find that the results of simultaneous inversion of the four tensor impedance elements and the two dip data are relatively more accurate and closer to the theoretical model among the three-dimensional inversion results of different data.