3-D Marine CSEM Forward Modeling With General Anisotropy Using an Adaptive Finite-Element Method
3-D Marine CSEM Forward Modeling With General Anisotropy Using an Adaptive Finite-Element Method
复制标题
使用自适应有限元方法进行具有一般各向异性的 3-D 海洋 CSEM 正演建模
DOI：
10.1109/lgrs.2020.3011743
复制
发表时间：
2021-11
影响因子：
4.8
通讯作者：
Bo Han
中科院分区：
文献类型：
--
作者：
Jiankai Li;Yuguo Li;Ying Liu;Klaus Spitzer;Bo Han
为了研究方位各向异性对频域海洋受控源电磁 (CSEM) 响应的影响，本文提出了一种基于边缘的自适应有限元 (FE) 建模算法。 3-D 算法能够处理一般各向异性导电介质。它是在非结构化四面体网格上实现的，允许复杂的模型几何形状。有限元解的精度通过自适应网格细化进行控制，迭代执行该网格细化，直到解收敛到所需的精度公差。该算法针对具有各向异性的一维分层模型的准解析解进行了验证。然后，我们在一组 3-D 各向异性模型上模拟海洋 CSEM 响应，并说明方位各向异性对直列和侧面海洋 CSEM 响应都有相当大的影响，但影响程度不同。
To investigate the effect of azimuthal anisotropy on frequency-domain marine controlled-source electromagnetic (CSEM) responses, an adaptive edge-based finite-element (FE) modeling algorithm is presented in this letter. The 3-D algorithm is capable of dealing with generally anisotropic conductive media. It is implemented on unstructured tetrahedral grids, which allow for complex model geometries. The accuracy of the FE solution is controlled through adaptive mesh refinement, which is performed iteratively until the solution converges to the desired accuracy tolerance. The algorithm is validated against the quasi-analytic solutions for a 1-D layered model with anisotropy. We then simulate the marine CSEM responses over a set of 3-D anisotropic models and illustrate that the azimuthal anisotropy has a considerable influence on both the inline and broadside marine CSEM responses but to different extents.