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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (1): 1-8.doi: 10.11872/j.issn.1005-2518.2018.01.001

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Multi-channel Transient Electromagnetic Method：A New Geophysical Method and Its Application in Exploring Metallic Ore Deposits

ZHANG Wenwei 1，2，DI Qingyun 1，2，LEI Da 1，2，MA Fengshan 1，2   

  1. 1.Key Laboratory of Shale Gas and Geoengineering，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing    100029，China；
    2.University of Chinese Academy of Sciences，Beijing    100049，China
  • Received:2017-07-04 Revised:2017-11-02 Online:2018-02-28 Published:2018-05-19
  • Supported by:

    国家重大科研装备研制项目“深部资源探测核心装备研发”（编号：ZDYZ2012-1）-05子项目“多通道大功率电法勘探仪”资助

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Abstract:

As a new electromagnetic exploration method，multi-channel transient electromagnetic method（M-TEM） distinguishes itself from the electromagnetic family by its high resolution and large detection depth.The peak times of cross correlation function between transmitting current and received voltage give a new pseudo cross-section profile of apparent resistivity，which can reflect underground geoeletric structure very well.The field survey and data processing of M-TEM was discussed.In addition，a single-line M-TEM survey was conducted in Baertaolegai-Fuxingmen silver-lead-zinc polymetallic ore investigation zone.In data acquisition，it is deployed that a 240 m or 480 m inline dipole galvanic current source and 180 inline potential receivers with length of 60 m along 10.8 km survey line.The resulting pseudo cross section of M-TEM apparent resistivity is consistent with the borehole result.It is considered that M-TEM has a great application potential in future metal mineral exploration.

Key words: multi-channel transient electromagnetic （M-TEM） , Wiener filtering, cross correlation, earth impulse response, green function, metal mineral exploration, Da Hinggan Mountains, Baertaolegai-Fuxingtun

CLC Number: 

  • P618.4


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