Two-dimensional controlled source electromagnetic inversion algorithm based on a space domain forward modeling approach

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geophysical Prospecting Pub Date : 2024-07-22 DOI:10.1111/1365-2478.13575
Iktesh Chauhan, Rahul Dehiya
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Abstract

We develop a two-dimensional controlled-source electromagnetic inversion algorithm employing a space domain forward modelling algorithm. The space domain forward modelling algorithm is devised by imposing boundary conditions on the plane perpendicular to the strike direction that passes through the source position. The boundary conditions for various source types are derived using the symmetric/antisymmetric character of the electric and magnetic fields. The benchmarking analysis reveals that roughly eight grids are sufficient for discretizing space in the strike directions for accurate forward response computations. For inverse modelling, the inexact Gauss–Newton optimization technique is utilized. Numerical inversion experiments of synthetic and real-field data clearly demonstrate the versatility and robustness of the developed algorithm. The inversion experimentations also concur with the forward response benchmarking analysis and suggest that only a few grids (around eight) are adequate to discretize space in the strike direction. The developed algorithm is more than one order efficient compared to a wavenumber domain code.

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基于空间域前向建模方法的二维受控源电磁反演算法
我们开发了一种二维受控源电磁反演算法,采用了空间域前向建模算法。空间域前向建模算法是通过在垂直于通过源位置的打击方向的平面上施加边界条件而设计的。利用电场和磁场的对称/非对称特性推导出各种源类型的边界条件。基准分析表明,大约 8 个网格足以离散冲击方向的空间,从而进行精确的正向响应计算。在反演建模方面,采用了不精确的高斯-牛顿优化技术。合成数据和实际现场数据的数值反演实验清楚地证明了所开发算法的多功能性和稳健性。反演实验还与前向响应基准分析相吻合,表明只需几个网格(约八个)就足以离散出走向方向的空间。所开发的算法与波数域代码相比,效率提高了一个数量级以上。
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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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Issue Information Simultaneous inversion of four physical parameters of hydrate reservoir for high accuracy porosity estimation A mollifier approach to seismic data representation Analytic solutions for effective elastic moduli of isotropic solids containing oblate spheroid pores with critical porosity An efficient pseudoelastic pure P-mode wave equation and the implementation of the free surface boundary condition
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