吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (5): 1527-1537.doi: 10.13278/j.cnki.jjuese.201605301

• 地球探测与信息技术 • 上一篇    下一篇

覆盖层影响下典型地-井模型瞬变电磁法正演

杨海燕1,2, 岳建华3, 徐正玉2, 张华2, 姜志海3   

  1. 1. 东华理工大学省部共建核资源与环境国家重点实验室培育基地, 南昌 330013;
    2. 东华理工大学放射性地质与勘探技术国防重点学科实验室, 南昌 330013;
    3. 中国矿业大学资源与地球科学学院, 江苏 徐州 221116
  • 收稿日期:2016-01-09 出版日期:2016-09-26 发布日期:2016-09-26
  • 通讯作者: 岳建华(1964-),教授,博士生导师,主要从事煤炭电法勘探与矿井地球物理勘探研究,E-mail:yuejh@cumt.edu.cn E-mail:yuejh@cumt.edu.cn
  • 作者简介:杨海燕(1980-),副教授,博士,主要从事电磁法勘探方面的理论与应用研究,E-mail:genious_yang@126.com
  • 基金资助:

    国家自然科学基金项目（41564001，41164003，41264004，41304113，41174107）；江西省自然科学基金项目（20151BAB203045）

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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摘要：

地-井瞬变电磁法是用于地质找矿的有效方法之一，开展该方法的三维正演研究能对资料处理与解释提供帮助。在时间域有限差分算法的基础上，建立了三维地质模型和覆盖层模型，模拟了该模型下的地-井瞬变电磁响应；引入了参数EA，分析了方形低阻体和覆盖层的响应特征以及覆盖层影响因素。结果显示：低阻体位于发射场源下方时，其响应曲线呈现“双高一低”的极值特征，高峰值分别对应低阻体上下边界，低峰值对应低阻体中心；低阻体位于发射场源旁边时，其响应曲线呈现单极值特征，该特征与覆盖层响应特征相同。当覆盖层电阻率较低时，“趋肤效应”作用使覆盖层的响应强度强于低阻体；但当发射场源离钻孔足够远时，覆盖层影响可以忽略，低阻体响应强度更与覆盖层-低阻体电阻率的比值有关。孔中发射能有效降低覆盖层影响。

关键词: 地-井瞬变电磁法, 覆盖层, 正演, 有限差分法, 廖氏吸收边界条件

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

中图分类号: 

  • P631.3

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