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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (1): 1-8.doi: 10.11872/j.issn.1005-2518.2018.01.001

• 矿产勘查与资源评价 •    下一篇

物探新方法——多通道瞬变电磁法在金属矿勘探中的应用

张文伟1,2,底青云1,2*,雷达1,2,马凤山1,2   

  1. 1.中国科学院地质与地球物理研究所,中国科学院页岩气与地质工程重点实验室,北京 100029;
    2.中国科学院大学,北京 100049
  • 收稿日期:2017-07-04 修回日期:2017-11-02 出版日期:2018-02-28 发布日期:2018-05-19
  • 通讯作者: 底青云(1964-),女,河北石家庄人,研究员,从事地球电磁方法研究工作。qydi@mail.iggcas.ac.cn
  • 作者简介:张文伟(1989-),男,湖南衡阳人,博士研究生,从事地球电磁方法数据处理和应用研究工作。wwzhang0421@163.com

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

摘要:

多通道瞬变电磁法是一种新的电磁勘探方法,具有分辨率高和探测深度大等优点。多通道瞬变电磁法同时记录发射电流和多道接收电压,通过接收电压和发射电流的互相关可以估计大地脉冲响应的峰值时刻,从而得到一种新的视电阻率剖面,能够很好地反映地下地电结构。通过对多通道瞬变电磁法野外工作与数据处理方法进行探讨,在内蒙古巴尔陶勒盖—复兴屯银铅锌多金属矿普查区进行了多通道瞬变电磁法实际勘探。野外数据采集时,通过240 m(或480 m)接地偶极子发射电流,180道60 m接收偶极沿10.8 km的接收剖面布设采集接收电压。对采集的数据进行处理获得了多通道瞬变电磁法视电阻率剖面,该剖面与已知钻孔资料吻合很好。研究认为多通道瞬变电磁法在未来金属矿勘探中具有良好的应用前景。

关键词: 多通道瞬变电磁法, 维纳滤波, 互相关, 大地脉冲响应, 格林函数, 金属矿勘探, 大兴安岭, 巴尔陶勒盖—复兴屯

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

中图分类号: 

  • P618.4


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