地球物理学进展 ›› 2019, Vol. 34 ›› Issue (5): 1859-1865.doi: 10.6038/pg2019CC0257

• 应用地球物理学Ⅰ(油气及金属矿产地球物理勘探) • 上一篇    下一篇

SOTEM多分量激电响应特性分析

陈稳1,2,3,薛国强1,2,3,*(),陈卫营1,2,3,周楠楠1,2,3,卢云飞4   

  1. 1. 中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京 100029
    2. 中国科学院地球科学研究院,北京 100029
    3. 中国科学院大学,北京 100049
    4. 北京君和信达科技有限公司,北京 100083
  • 收稿日期:2018-11-15 修回日期:2019-06-05 出版日期:2019-10-28 发布日期:2019-10-28
  • 通讯作者: 薛国强 E-mail:xueguoqiang@mail.iggcas.ac.cn
  • 作者简介:陈稳,男,1993年生,黑龙江齐齐哈尔人,中国科学院大学,博士研究生,主要从事瞬变电磁法正反演研究.(E-mail: chenwen@mail.iggcas.ac.cn)
  • 基金资助:
    国家自然科学基金(41474095、41704076);北京市自然科学基金(8182054)

Multi-component response of SOTEM with IP effect

CHEN Wen1,2,3,XUE Guo-qiang1,2,3,*(),CHEN Wei-ying1,2,3,ZHOU Nan-nan1,2,3,LU Yun-fei4   

  1. 1. The Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    2. The Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
    3. The University of Chinese Academy of Sciences, Beijing 100049, China
    4. PowerScan Company Limited, Beijing 100083, China
  • Received:2018-11-15 Revised:2019-06-05 Online:2019-10-28 Published:2019-10-28
  • Contact: Guo-qiang XUE E-mail:xueguoqiang@mail.iggcas.ac.cn

摘要:

电性源短偏移距瞬变电磁法(SOTEM)具有探测深度大、分辨率高、施工方便等特点,在第二深度空间(500~2000 m)金属矿勘探中发挥了重要作用.实际测量中,当遇到具有激发极化效应的岩矿石时,SOTEM观测曲线会出现畸变和负值响应(符号反转)的现象.SOTEM激电效应的研究对金属矿勘探具有重要意义,为此,本文对SOTEM多分量激电响应特性进行分析.通过基于Cole-Cole模型的SOTEM一维正演计算,分析了不同装置参数(收发距,极化体埋深)和极化参数(极化体电阻率、极化率,频率相关系数以及时间常数)对常用的ExHz和dHz/dt电磁场的影响规律,研究结果表明水平电场分量受激电效应的影响最大,垂直磁场分量和垂直磁场分量的时间导数受到的影响要小得多,研究结果将有助于指导野外实际生产.

关键词: 电性源瞬变电磁法, 电性源短偏移距瞬变电磁法(SOTEM), 多分量, 激电响应, Cole-Cole模型

Abstract:

The Short-Offset Grounded-Wire Transient Electromagnetic (SOTEM) method can realize large-depth detection easily with high resolution. It plays an important role in the exploration of deep-seated metal ores in the second depth space. In practical measurement, rocks with induced polarization effects will cause distortion and negative values in the observed SOTEM curves. In this paper, multi-component EM responses with the IP effects are analyzed. We analyze the IP effect with different device parameters (source-receiver separation, depth of the polarized body) and polarization parameters (the resistivity of polarized body, polarizability, the frequency correlation coefficient and time constant) on the Ex, Hz and dHz/dt using the 1D forward routine based on Cole-Cole model. It is concluded that the horizontal electric field is seriously affected while the vertical magnetic field component and its time derivative are less affected, which is a good guide to the SOTEM field work.

Key words: Grounded-wire transient electromagnetic method, Short-Offset Grounded-Wire Transient Electromagnetic (SOTEM), Multi-component, IP effect, Cole-Cole model

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