基于瞬变电磁矩变换的快速三维反演方法

发布时间：2018-03-18 23:01

本文选题：瞬变电磁法　切入点：瞬变电磁矩变换　出处：《地球物理学报》2016年11期 　论文类型：期刊论文

【摘要】：瞬变电磁法的严格三维反演计算复杂、占用资源多,在普通计算机上难以实现.本文引入瞬变电磁矩变换的概念,提出一种快速三维反演方法.该方法基于阻性限制(resistive limit)特性,建立包含异常体的三维大地的一阶矩响应正演算法,根据不同约束条件,选择优化的最速下降法实现瞬变电磁快速三维反演.文中通过含异常体的三维大地正演一阶矩与仿真数据一阶矩的对比,验证了快速三维正演算法的有效性,之后在不同约束条件下,利用优化的最速下降法实现了对含噪声的仿真瞬变电磁数据的快速三维反演.结果表明,该方法能够在普通计算机上短时间内较为准确地反演出地下异常体的体积和位置,在瞬变电磁数据的实时解释工作中具有良好的应用前景.
[Abstract]:The strict 3D inversion of transient electromagnetic method is complicated, takes up more resources, and is difficult to be realized on ordinary computer. This paper introduces the concept of transient electromagnetic moment transform and presents a fast 3D inversion method. The method is based on resistive limiting property. The first-order moment response forward algorithm for 3D geodetic with abnormal body is established, and according to different constraint conditions, the first order moment response forward algorithm is established. The optimal steepest descent method is chosen to realize the fast 3D inversion of transient electromagnetic. The validity of the fast 3D forward algorithm is verified by comparing the first order moment of 3D geodetic forward modeling with the first order moment of simulation data. Then, under different constraint conditions, a fast 3D inversion of simulated transient electromagnetic data with noise is realized by using the optimal steepest descent method. The results show that, This method can accurately reverse the volume and position of the underground abnormal body in a short time on the ordinary computer, and has a good application prospect in the real-time interpretation of transient electromagnetic data.
【作者单位】：中国科学院电磁辐射与探测技术重点实验室;中国科学院大学;
【基金】：国家重大科研装备研制项目(ZDYZ2012-1-03-01)资助
【分类号】：P631.325

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