Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (5): 1552-1561.doi: 10.13278/j.cnki.jjuese.201705303

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Three-Dimension Forward Modeling and Characteristics for Surface-Borehole Transient Electromagnetic by Using Staggered-Grid Finite Difference Method

Li Dajun, Weng Aihua, Yang Yue, Li Sirui, Li Jianping, Li Shiwen   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2016-12-23 Online:2017-09-26 Published:2017-09-26
  • Supported by:
    Supported by the Chinese Science and Technology Major Instrument Project (2011YQ05006010)

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Abstract: In this study, we developed three-dimension forward modeling for surface-borehole transient electromagnetic (TEM) by using staggered-grid finite difference method, and obtained transient electromagnetic response characteristics from different borehole positions for a conductive thin plate. The Helmholtz function is discreted by staggered-grid finite difference method in frequency domain, then the abnormal-field is quickly processed using MUMPS package. Background Green function can be efficiently computed by equivalent fictitious square overlay method and virtual interface method, which extending the transmitter and receiver to anywhere in full space. The cosine-transformation was performed for borehole transient electromagnetic response in any position, then the mentioned algorithm was validated by three-dimension model. We designed two three-dimension conductive models, one is the homogeneous half-space, the other is an embedded conductive plate, to get the three-dimension distribution of vertical magnetic field in the time domain, and then we analyzed the influence of the conductive body on transient electromagnetic response. It is shown that the solution of three-dimension transient electromagnetic in this study is comparable to those of the predecessors'. The existence of a conductive plate influences mainly on borehole TEM near the plate body and through the conductive thin plate; and TEM symbol change occurs in the middle time channels near the abnormal body. The proposed research provides a technical method for qualitative interpretation of surface-borehole transient electromagnetic data, and lays the foundation for three-dimension inversion of surface-borehole transient electromagnetic

Key words: surface-borehole transient electromagnetic, three-dimensional forward, finite-difference, cosine-transformation, virtual-surface method

CLC Number: 

  • P631.3
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