卢杰^1,,
李予国^1,2,,
1. 中国海洋大学海洋地球科学学院, 青岛 266100
2. 海底科学与探测技术教育部重点实验室, 青岛 266100

基金项目: 国家自然科学重点基金项目（41774080，41130420）资助


详细信息

作者简介: 卢杰, 男, 1989年生, 博士研究生.主要从事电磁场正演研究.E-mail:lj0830@outlook.com

通讯作者: 李予国, 1965年生.主要从事电磁场数值模拟和反演方法及海洋电磁法研究工作.E-mail:yuguo@ouc.edu.cn

中图分类号: P631

收稿日期:2018-02-12
修回日期:2018-12-10
上线日期:2019-08-05

Three-dimensional marine CSEM modeling in fictitious wave domain

LU Jie^1,,
LI YuGuo^1,2,,
1. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2. Key Lab of Submarine Geosciences and Prospecting Techniques of Ministry of Education, Ocean University of China, Qingdao 266100, China


More Information

Corresponding author: LI YuGuo,E-mail:yuguo@ouc.edu.cn

MSC: P631

--> Received Date: 12 February 2018
Revised Date: 10 December 2018
Available Online: 05 August 2019


摘要
摘要:本文基于对应原理将似稳态条件下频率域电磁场扩散方程转换成虚拟波动域电磁场波动方程，采用高阶时域有限差分进行求解，引入复频移完全匹配层吸收边界条件，降低了内存需求，提高了计算效率，并在虚拟波动域用伪δ函数离散电偶极源，实现了虚拟波动域任意取向电偶极源三维海洋可控源电磁场高阶时域有限差分正演算法.通过与拟解析解和频率域三维可控源电磁场数值模拟结果的对比，验证了本文算法的正确性和高效性，且探讨了网格参数和边界条件对不同频率电磁场模拟结果的影响.
关键词: 虚拟波动域/
波动域电磁场方程/
海洋可控源电磁法/
高阶时域有限差分/
复频移完全匹配层

Abstract:In this paper, we transform quasi-state frequency domain diffusion equations to wave equations in the fictitious wave domain. A complex frequency shifted perfectly matched layer (CFS-PML) boundary condition is adopted to the high-order finite difference time domain (FDTD) algorithm for reducing storage requirements and improving computational efficiency. We divide the dipole source by the pseudo-delta function for simulating electromagnetic response of arbitrary orientation electric dipole. By comparing the numerical solution with 1D analytical solution and 3D frequency controlled source electromagnetic (CSEM) results, we verify the validity, the accuracy and the efficiency of the algorithm, and then investigate and analyze the influence of different grid parameters and boundary conditions on numerical result at different frequency.
Key words:Fictitious wave domain/
Wave equation/
Marine CSEM/
High-order FDTD/
Complex frequency shifted perfectly matched layer



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