三维时间域航空电磁任意各向异性正演模拟

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Published in应用地球物理：英文版 Vol. 14; no. 3; pp. 431 - 440
Main Author 黄威 贲放 殷长春 孟庆敏 李文杰 廖桂香 吴珊 西永在
Format Journal Article
LanguageEnglish
Published 2017
Subjects
三维时间域航空电磁法
任意各向异性
矢量有限元法
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Bibliography:Electrically anisotropic strata are abundant in nature, so their study can help our data interpretation and our understanding of the processes of geodynamics. However, current data processing generally assumes isotropic conditions when surveying anisotropic structures, which may cause discrepancies between reality and electromagnetic data interpretation. Moreover, the anisotropic interpretation of the time-domain airborne electromagnetic （TDAEM） method is still confined to one dimensional （1D） cases, and the corresponding three-dimensional （3D） numerical simulations are still in development. In this study, we expanded the 3D TDAEM modeling of arbitrarily anisotropic media. First, through coordinate rotation of isotropic conductivity, we obtained the conductivity tensor of an arbitrary anisotropic rock. Next, we incorporated this into Maxwell＇s equations, using a regular hexahedral grid of vector finite elements to subdivide the solution area. A direct solver software package provided the solution for the sparse linear equations that resulted. Analytical solutions were used to verify the accuracy and feasibility of the algorithm. The proven model was then applied to analyze the effects of arbitrary anisotropy in 3D TDAEM via the distribution of responses and amplitude changes, which revealed that different anisotropy situations strongly affected the responses of TDAEM.
Huang Wei1,3, Ben Fang1,3, Yin Chang-Chun2, Meng Qing-Min1, Li Wen-Jie1, Liao Gui-Xiang1, Wu Shan1, and Xi Yong-Zai1 （1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Science, Langfang 065000, China. 2. College of Geo-exploration Sciences and Technology, Jilin University, Changchun 130021, China. 3. Laboratory of geophysical Electromagnetic Probing Technologies, Ministry of land and Resources, Langfang 065000, China.）
11-5212/O
Three-dimensional time-domain airborne electromagnetic, arbitrary anisotropy, vector finite element
ISSN:1672-7975
1993-0658