2D marine controlled-source electromagnetic modeling: Part 1 — An adaptive finite-element algorithm
2D marine controlled-source electromagnetic modeling: Part 1 — An adaptive finite-element algorithm
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DOI：
10.1190/1.2432262
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发表时间：
2007-03
期刊：
影响因子：
3.3
通讯作者：
Yuguo Li;K. Key
中科院分区：
文献类型：
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作者：
Yuguo Li;K. Key
在这项工作的第1部分中，我们开发了一个自适应有限元算法的频率域，海洋受控源电磁（CSEM）响应的二维导电性结构，激发水平电偶极子源的正演模拟。在将二次电磁场的控制方程变换到波数域之后，利用有限元方法近似了平行走向电场和磁场的两个偏微分方程的耦合系统。模型域离散化使用非结构化三角形单元网格，很容易容纳任意复杂的结构。用拟最小残差法（QMR）得到了线性方程组的数值解，该方法比全矩阵求逆法需要更少的存储空间。我们实现了一个automatedadaptive网格细化算法，在该算法中，有限元解迭代计算连续细化网格。网格细化是…
In Part 1 of this work, we develop an adaptive finite-element algorithm for forward modeling of the frequency-domain, marine controlled-source electromagnetic (CSEM) response of a 2D conductivity structure that is excited by a horizontal electric dipole source. After transforming the governing equations for the secondary electromagnetic fields into the wavenumber domain, the coupled system of two partial differential equations for the strike-parallel electric and magnetic fields is approximated using the finite-element method. The model domain is discretized using an unstructured triangular element grid that readily accommodates arbitrarily complex structures. A numerical solution of the system of linear equations is obtained using the quasi-minimal residual (QMR) method, which requiresmuch less storagethan full matrix inversion methods. We implement an automatedadaptive grid refinement algorithm in which the finite-element solution is computed iteratively on successively refined grids. Grid refinement is...