物探新方法-多通道瞬变电磁法在金属矿勘探中的应用
收稿日期: 2017-07-04
修回日期: 2017-11-02
网络出版日期: 2018-05-19
Multi-channel Transient Electromagnetic Method：A New Geophysical Method and Its Application in Exploring Metallic Ore Deposits
Received date: 2017-07-04
Revised date: 2017-11-02
Online 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
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。
张文伟 , 底青云 , 雷达 , 马凤山 . 物探新方法-多通道瞬变电磁法在金属矿勘探中的应用[J]. 黄金科学技术, 2018 , 26(1) : 1 -8 . DOI: 10.11872/j.issn.1005-2518.2018.01.001
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.
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