Three-dimensional arbitrarily anisotropic modeling for time-domain airborne electromagnetic surveys

被引:8
|
作者
Huang Wei [1 ,3 ]
Ben Fang [1 ,3 ]
Yin Chang-Chun [2 ]
Meng Qing-Min [1 ]
Li Wen-Jie [1 ]
Liao Gui-Xiang [1 ]
Wu Shan [1 ]
Xi Yong-Zai [1 ]
机构
[1] Chinese Acad Geol Sci, Inst Geophys & Geochem Explorat, Langfang 065000, Peoples R China
[2] Jilin Univ, Coll Geoexplorat Sci & Technol, Changchun 130021, Peoples R China
[3] Minist Land & Resources, Lab Geophys Electromagnet Probing Technol, Langfang 065000, Peoples R China
基金
中国国家自然科学基金;
关键词
Three-dimensional time-domain airborne electromagnetic; arbitrary anisotropy; vector finite element; VECTOR FINITE-ELEMENT; INVERSION; 3D; 2-D;
D O I
10.1007/s11770-017-0627-8
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
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.
引用
收藏
页码:431 / 440
页数:10
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