| Complex Frequency-Shifted Perfectly Matched Layers for 2.5D Frequency-Domain Marine Controlled-Source EM Field Simulations | |
Li, Gang1; Zhang, Liang2 ; Goswami, Bedanta K.3
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| 2022-03-22 | |
| 发表期刊 | SURVEYS IN GEOPHYSICS
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| ISSN | 0169-3298 |
| 页码 | 30 |
| 通讯作者 | Li, Gang([email protected]) |
| 摘要 | For geophysical electromagnetic (EM) forward modeling problems, the accuracy of solutions mainly depends on the numerical modeling method used and the corresponding boundary conditions. Most multi-dimensional EM studies deal with numerical methods for discretisation (e.g., finite-difference, finite-element, integral equation, etc.) and pay less attention to the boundaries. This review presents the recent research on optimizing boundary conditions for the frequency-domain marine controlled-source EM (CSEM) forward modeling algorithm. Current geophysical EM field simulation techniques usually utilize the truncated Dirichlet boundary condition, which requires the modeling domain boundaries to be far away from the area of interest and field values to be zero at the boundaries to mitigate artificial reflections/refractions resulting from truncated boundaries. The perfectly matched layer (PML) approach with few additional absorbing layers can serve as an alternative boundary to supress these truncated boundary effects. In this review, the application of the PML boundary condition to marine CSEM using a staggered finite-difference scheme for the 2.5D problem in vertical transverse isotropic (VTI) conductivity structures is introduced. This new algorithm utilizes the complex frequency-shifted PML (CFS-PML) boundary condition. The selection of optimal PML parameters are also further investigated for numerical stability. Numerical tests for several Earth conductivity models show that the CFS-PML approach is of similar high accuracy compared to using traditional Dirichlet boundary condition and exhibits additional advantages in terms of computational time and memory usage. Furthermore, the numerical tests indicate that the proposed forward modeling algorithm using CFS-PML boundary condition works well for both shallow and deep water cases, including the application to real field example from the Troll Field in Norway. The detectability of subsurface-related EM fields in airwave dominated shallow waters can be enhanced by using the weighted difference fields for mitigating the effect of airwaves on the models. |
| 关键词 | Marine electromagnetics (EM) Boundary condition Perfectly matched layers (PML) |
| DOI | 10.1007/s10712-022-09699-z |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[42076060]; Open Fund of the Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences[OMG2020-01]; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2020KG0] |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000771862300001 |
| 出版者 | SPRINGER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/178649 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Li, Gang |
| 作者单位 | 1.Zhejiang Univ, Ocean Coll, Dept Marine Sci, Zhoushan 316021, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.SAND Geophys, 15 Sidings, Southampton SO31 5QA, Hants, England |
| 推荐引用方式 GB/T 7714 | Li, Gang,Zhang, Liang,Goswami, Bedanta K.. Complex Frequency-Shifted Perfectly Matched Layers for 2.5D Frequency-Domain Marine Controlled-Source EM Field Simulations[J]. SURVEYS IN GEOPHYSICS,2022:30. |
| APA | Li, Gang,Zhang, Liang,&Goswami, Bedanta K..(2022).Complex Frequency-Shifted Perfectly Matched Layers for 2.5D Frequency-Domain Marine Controlled-Source EM Field Simulations.SURVEYS IN GEOPHYSICS,30. |
| MLA | Li, Gang,et al."Complex Frequency-Shifted Perfectly Matched Layers for 2.5D Frequency-Domain Marine Controlled-Source EM Field Simulations".SURVEYS IN GEOPHYSICS (2022):30. |
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| Li2022_Article_Compl（3394KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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