Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (2): 433-444.doi: 10.13278/j.cnki.jjuese.20170243

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3D Vector Finite-Element Airborne Electromagnetic Modelling in an Arbitrary Anisotropic Medium

Zeng Zhaofa1,2, Huo Zhijun1,2, Li Wenben3, Li Jing1,2, Zhao Xueyu1,2, He Rongqin1,2   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. Key Laboratory of Applied Geophysics, Ministry of Land and Resources of PRC, Changchun 130026, China;
    3. College of Information Engineering, Hebei GEO University, Shijiazhuang 050031, China
  • Received:2017-09-07 Online:2018-03-26 Published:2018-03-26
  • Supported by:
    Supported by Sub Project of National Key Projects (2016YFC060110402),National Natural Science Foundation of China (41504083) and China Postdoctoral Science Foundation Project (2015M571366)

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Abstract: In the application of airborne electromagnetic detecting method, underground detection environment is complex, and the physical parameters of underground media are anisotropic. If we use the conventional model of isotropic medium, serious deviations will occur during the data interpretation. This paper presents three-dimensional frequency-domain airborne electromagnetic modeling in an arbitrary anisotropic medium based on the vector finite element method. By decomposing the total field into primary and secondary fields, the uniform space of the air medium is subjected to the analytic calculation of the primary field, and the vector finite element method is used to solve the double-rotation equation of the secondary electric field. The parallel solution of the large-scale sparse matrix is calculated by using the shared-memory direct solver PARDISO, so that the 3D model calculation is greatly speeded up. Then the 3D anisotropic media simulations of four typical target-models are carried out, including isotropic rock-anisotropic target (rotate around the z axis) model,isotropic rock-anisotropic target (rotate around x axis) model, isotropic rock-anisotropic target (rotate around z axis) model, and anisotropic rock-anisotropic target rotate (around x axis) model. The change characteristics of the real and imaginary components of the magnetic field under different rotating angles in different models are analyzed and compared, and the influence law and identification method of the anisotropic parameters in airborne electromagnetic response are summarized. The research can provide a reference for the accurate interpretation and inversion of the airborne electromagnetic data.

Key words: frequency-domain airborne EM, vector finite element method, arbitrarily anisotropic medium

CLC Number: 

  • P631.1
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[1] Yan Jiabin, Huang Xiangyu. Vector Finite Element Method [J]. Journal of Jilin University(Earth Science Edition), 2016, 46(5): 1538-1549.
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