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)

PDF (PC)

445

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

[1] 蒋邦远. 实用近区磁源瞬变电磁法勘探[M]. 北京:地质出版社, 1998. Jiang Bangyuan. Applied near Zone Magnetic Source Transient Electromagnetic Exploration[M]. Beijing:Geological Publishing House, 1998.

[2] 牛之琏. 时间域电磁法勘探[M]. 长沙:中南大学出版社, 2007. Niu Zhilian. The Theory of Time Domain Electromagnetic Methods[M]. Changsha:Central South University of Technology Press, 2007.

[3] 张杰. 地-井瞬变电磁异常特征分析及矢量交会解释方法[D]. 北京:中国地质大学, 2009. Zhang Jie. Analysis of Anomalous Character and Study Vector Intersection for Down-Hole Transient Electromagnetic Method[D]. Beijing:China University of Geosciences, 2009.

[4] 戴雪平.地-井瞬变电磁法三维响应特征研究[D]. 北京:中国地质大学, 2013. Dai Xueping. Research on Three-Dimensional Response Characteristic of Borehole Transient Electromagnetic Method[D]. Beijing:China University of Geosciences, 2013.

[5] Woods D V. A Model Study of the Crone Borehole Pulse Electromagnetic (PEM) System[Z]. Ontario:Queen's University,, 1975.

[6] Dyck A V, West G F. The Role of Simple Computer Models in Interpretations of Wide-Band, Drill-Hole Electromagnetic Surveys in Mineral Exploration[J]. Geophysics, 1984, 49(7):957-980.

[7] Macnae J, Staltari G. Classification of Sign Changes in Borehole TEM Decays[J]. Exploration Geophysics,1987, 18(3):331-339.

[8] Newman G A, Commer M. New Advances in Three Dimensional Transient Electromagnetic Inversion[J].Geophysical Journal International, 2005, 160(1):5-32.

[9] Buselli G, Lee S K. Modelling of Drill-Hole TEM Response from Multiple Targets Covered by a Conductive Overburden[J]. Exploration Geophysics, 1996, 27(3):141-153.

[10] 孟庆鑫, 潘和平. 地-井瞬变电磁响应特征数值模拟分析[J]. 地球物理学报, 2012, 55(3):1046-1053. Meng Qingxin, Pan Heping. Numerical Simulation Analysis of Surface-Hole TEM Responses[J]. Chinese Journal of Geophysics, 2012, 55(3):1046-1053

[11] 孟庆鑫, 潘和平,牛峥. 大地介质影响下地-井瞬变电磁的正演模拟研究[J]. 中国矿业大学学报, 2014, 43(6):1113-1119. Meng Qingxin, Pan Heping, Niu Zheng. Forward Simulation of Surface-Borehole TEM in Geological Medium Effect[J].Journal of China University of Mining & Technology, 2014, 43(6):1113-1119.

[12] 杨海燕,岳建华.吸收边界条件在全空间瞬变电磁计算中的应用[J].中国矿业大学学报, 2009,38(2):263-268. Yang Haiyan, Yue Jianhua. Application of Absorbing Boundary Condition in Whole-Space Computation of Transient Electromagnetic Response[J]. Journal of China University of Mining & Technology, 2009, 38(2):263-268.

[13] 杨海燕,邓居智,张华,等. 矿井瞬变电磁法全空间视电阻率解释方法研究[J]. 地球物理学报,2010,53(3):651-656. Yang Haiyan, Deng Juzhi, Zhang Hua, et al. Research on Full-Space Apparent Resistivity Interpretation Technique in Mine Transient Electromagnetic Method[J]. Chinese Journal of Geophysics, 2010, 53(3):651-656.

[14] 杨海燕, 岳建华.矿井瞬变电磁法理论与技术研究[M]. 1版. 北京:科学出版社, 2015. Yang Haiyan, Yue Jianhua. The Theory and Technique of Mine Transient Electromagnetic Method[M]. 1st ed. Beijing:Science Press, 2015

[15] 岳建华,杨海燕,胡搏.矿井瞬变电磁法三维时域有限差分数值模拟[J].地球物理学进展,2007, 22(6):1904-1909. Yue Jianhua, Yang Haiyan, Hu Bo.3D Finite Difference Time Domain Numerical Simulation for TEM in Mine[J]. Progress in Geophysics, 2007, 22(6):1904-1909.

[16] 岳建华,杨海燕,邓居智.层状介质中地下瞬变电磁场全空间效应[J].地球物理学进展,2012,27(4):1385-1392. Yue Jianhua, Yang Haiyan, Deng Juzhi. Whole-Space Effect on Underground Transient Electromagnetic Field in Layered Media[J]. Progress in Geophysics,2012,27(4):1385-1392.

[17] 米萨克N纳比吉安.勘查地球物理电磁法:第1卷[M].赵经祥,王艳君,译.北京:地质出版社,1992. Misac N N. Electromagnetic Methods in Applied Geoghysics:Volume I[M]. Translated by Zhao Jingxiang, Wang Yanjun. Beijing:Geological Publishing House, 1992.

[18] 杨海燕,邓居智,汤洪志,等.全空间瞬变电磁法资料解释方法中的平移算法[J].吉林大学学报(地球科学版),2014, 44(3):1012-1017. Yang Haiyan, Deng Juzhi, Tang Hongzhi, et al. Translation Algorithm of Data Interpretation Technique in Full-Space Transient Electromagnetic Method[J]. Journal of Jilin University (Earth Sciences Edition), 2014, 44(3):1012-1017.

[19] 王言章,杨蒙蒙,符磊,等.浅层不均匀体对大定源瞬变电磁响应的影响[J].吉林大学学报(地球科学版),2014,44(2):653-659. Wang Yanzhang, Yang Mengmeng, Fu Lei, et al. Infuence of the Shallow Heterogeneities to the TEM Response of the Large Fixed Loop[J]. Journal of Jilin University (Earth Sciences Edition), 2014, 44(2):653-659.

[20] Oristaglio M L. Diffusion of Electromagnetic Fields into the Earth from a Line Source of Current[J]. Geophysics, 1982, 47(11):1585-1592.

[21] 孙怀风,李貅,李术才,等.考虑关断时间的回线源激发TEM三维时域有限差分正演[J].地球物理学报,2013,56(3):1049-1064. Sun Huaifeng, Li Xiu, Li Shucai, et al.Three-Dimensional FDTD Modeling of TEM Excited by a Loop Source Considering Ramp Time[J]. Chinese Journal of Geophysics, 2013, 56(3):1049-1064.

[22] 闫述,陈明生,傅君眉.瞬变电磁场的直接时域数值分析[J].地球物理学报, 2002, 45(2):275-284. Yan Shu, Chen Mingsheng, Fu Junmei. Direct Time-Domain Numerical Analysis of Transient Electromagnetic Fields[J]. Chinese Journal of Geophysics, 2002, 45(2):275-284.

[23] 谭捍东,余钦范,John Booker,等. 大地电磁法三维交错采样有限差分数值模拟[J].地球物理学报,2003,46(5):705-711. Tan Handong, Yu Qinfan, John B, et al. Magne-totelluric Three-Dimensional Modeling Using the Staggered-Grid Finite Difference Method[J]. Chinese Journal of Geophysics, 2003, 46(5):705-711.

[24] 董浩,魏文博,叶高峰,等.基于有限差分正演的带地形三维大地电磁反演方法[J].地球物理学报,2014,57(3):939-952. Dong Hao, Wei Wenbo, Ye Gaofeng, et al. Study of Three-Dimensional Magnetotelluric Inversion Including Surface Topography Based on Finite-Difference Method[J]. Chinese Journal of Geophysics, 2014, 57(3):939-952.

[25] Greenfield R J, Wu S T. Electromagnetic Wave Propa-gation in Disrupted Coal Seams[J]. Geophysics, 1991, 56(10):1571-1577.
[1] 李建平, 翁爱华, 李世文, 李大俊, 李斯睿, 杨悦, 唐裕, 张艳辉. 基于球坐标系下有限差分的地磁测深三维正演[J]. 吉林大学学报(地球科学版), 2018, 48(2): 411-419.
[2] 殷长春, 卢永超, 刘云鹤, 张博, 齐彦福, 蔡晶. 多重网格准线性近似技术在三维航空电磁正演模拟中的应用[J]. 吉林大学学报(地球科学版), 2018, 48(1): 252-260.
[3] 陈辉, 尹敏, 殷长春, 邓居智. 大地电磁三维正演聚集多重网格算法[J]. 吉林大学学报(地球科学版), 2018, 48(1): 261-270.
[4] 安振芳, 张进, 张建中. 海洋三维VC观测系统优化设计[J]. 吉林大学学报(地球科学版), 2018, 48(1): 271-284.
[5] 李大俊, 翁爱华, 杨悦, 李斯睿, 李建平, 李世文. 地-井瞬变电磁三维交错网格有限差分正演及响应特性[J]. 吉林大学学报(地球科学版), 2017, 47(5): 1552-1561.
[6] 罗天涯, 熊彬, 蔡红柱, 陈欣, 刘云龙, 兰怀慷, 李祖强, 梁卓. 复杂电性结构大地电磁二维响应特征[J]. 吉林大学学报(地球科学版), 2017, 47(1): 215-223.
[7] 刘海飞, 柳杰, 高寒, 郭荣文, 童孝忠, 麻昌英. 五极纵轴激电测深三维有限元正演模拟[J]. 吉林大学学报(地球科学版), 2016, 46(3): 884-892.
[8] 李庆洋, 李振春, 黄建平, 李娜, 苏在荣. 基于贴体全交错网格的起伏地表正演模拟影响因素[J]. 吉林大学学报(地球科学版), 2016, 46(3): 920-929.
[9] 贲放, 刘云鹤, 黄威, 徐驰. 各向异性介质中的浅海海洋可控源电磁响应特征[J]. 吉林大学学报(地球科学版), 2016, 46(2): 581-593.
[10] 殷长春, 邱长凯, 刘云鹤, 蔡晶. 时间域航空电磁数据加权横向约束反演[J]. 吉林大学学报(地球科学版), 2016, 46(1): 254-261.
[11] 朱超, 夏志远, 王传武, 宋光永, 魏学斌, 王鹏, 王海峰, 王波. 致密油储层甜点地震预测[J]. 吉林大学学报(地球科学版), 2015, 45(2): 602-610.
[12] 杨海燕，邓居智，汤洪志，林云. 全空间瞬变电磁法资料解释方法中的平移算法[J]. 吉林大学学报(地球科学版), 2014, 44(3): 1012-1017.
[13] 郭振波，李振春. 起伏地表条件下频率-空间域声波介质正演模拟[J]. 吉林大学学报(地球科学版), 2014, 44(2): 683-693.
[14] 汤文武，柳建新，童孝忠. 电导率连续变化的线源FCSEM有限元正演模拟[J]. 吉林大学学报(地球科学版), 2013, 43(5): 1646-1654.
[15] 汤井田,薛帅. MT有限元模拟中截断边界的影响[J]. 吉林大学学报(地球科学版), 2013, 43(1): 267-274.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
版权所有 © 《吉林大学学报(地球科学版)》编辑部
地址：长春市西民主大街938号(130026)　电话：+86-431-88502374；13756165364　E-mail: xuebao1956@jlu.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发