Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (5): 1527-1537.doi: 10.13278/j.cnki.jjuese.201605301

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Transient Electromagnetic Method Modeling in Ground-Borehole Model with Overburden Influence

Yang Haiyan1,2, Yue Jianhua3, Xu Zhengyu2, Zhang Hua2, Jiang Zhihai3   

  1. 1. State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, China;
    2. Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Nanchang 330013, China;
    3. School of Resource and Earth Science, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China
  • Received:2016-01-09 Online:2016-09-26 Published:2016-09-26
  • Supported by:

    Supported by National Natural Science Foundation of China (41564001, 41164003, 41264004, 41304113, 41174107) and Natural Science Foundation of Jiangxi Province(20151BAB203045)

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Abstract:

As one of the effective methods used to geological prospecting, three dimensional modeling of ground-borehole transient electromagnetic method can offer help for data processing and interpretation. Based on time domain finite difference algorithm, ground-borehole transient electromagnetic response was simulated under three dimensional geological and overburden model. Ground-borehole transient response characteristics of conductive body and overburden, and influenced factors of overburden were analyzed by using the parameter EA. The results indicate that, ground-borehole transient response curves appear two high and one low extreme value when the conductive body locating below transmitter loop. The two high values occur at the depths of upper and down boundary of the body, while the low value occurs at depth of the center of the body. The curves show one single extreme value when the body locating beside loop, which is similar to overburden. Transient field value of overburden is higher than that of conductive body when the body has a lower resistivity because of skin effect. However, the value of overburden is comparatively lower making its influence can be ignored when the distance between transmitter loop and borehole is far enough. Conductor response is related to the ratio of overburden and body. Overburden effect can be effectively reduced.

Key words: ground-borehole transient electromagnetic method, overburden, modeling, finite difference method, Liao absorbing boundary condition

CLC Number: 

  • P631.3

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