|Table of Contents|

Characteristics of Axial Anisotropic Borehole Transient Electromagnetic Three-component Response(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第06期
Page:
737-748
Research Field:
电磁法勘探专辑
Publishing date:

Info

Title:
Characteristics of Axial Anisotropic Borehole Transient Electromagnetic Three-component Response
Author(s):
GUO Jian-lei1; 2;  JIANG Tao1;  GUO Heng1;  NING Hui1;  LIU Hang1
1. CCTEG Xi'an Research Institute, Xi'an 710077, Shaanxi, China; 2. Integrated Geophysical Simulation Lab(Key Laboratory of Chinese Geophysical Society), Chang'an University, Xi'an 710054, Shaanxi, China
Keywords:
borehole transient electromagnetic method;  finite difference time domain;  three-dimension;  forward modeling;  conductivity;  axial;  anisotropy;  three-component
PACS:
P631
DOI:
10.19814/j.jese.2020.06014
Abstract:
Based on the three-dimensional finite difference time domain algorithm, the conductivity tensor to construct the governing equation was introduced, the backward difference in space and the central difference in time for discretization were used, and the ampere loop theorem in the form of current density was added to realize the loading of current source. Finally, the influence of axial anisotropy of formation conductivity on borehole transient electromagnetic(BHTEM)three-component response was studied by axial anisotropic three-dimensional transient electromagnetic forward modeling. Meanwhile, compared with one-dimensional analytical solution of anisotropic half-space model, the accuracy of algorithm was verified. Then, an anisotropic three-dimensional model was established, and characteristics of borehole transient electromagnetic three-component response of the loop source were calculated. The results show that under the ground surface excitation condition, the horizontal axis conductivity anisotropy has greater influence on borehole transient electromagnetic three-component response than the vertical axis conductivity anisotropy; the x axis anisotropy has more influence on the By/t response than the y axis anisotropy, the y axis anisotropy has more influence on Bx/t response than x axis anisotropy. The results provide guidance for the interpretation of borehole transient electromagnetic anisotropy data and lay the foundation for borehole transient electromagnetic anisotropy inversion.

References:

[1] 薛国强,李 貅,底青云.瞬变电磁法正反演问题研究进展[J].地球物理学进展,2008,23(4):1165-1172. XUE Guo-qiang,LI Xiu,DI Qing-yun.Research Progress in TEM Forward Modeling and Inversion Calculation[J].Progress in Geophysics,2008,23(4):1165-1172.
[2] 薛国强,闫 述,底青云,等.多道瞬变电磁法(MTEM)技术分析[J].地球科学与环境学报,2015,37(1):94-100. XUE Guo-qiang,YAN Shu,DI Qing-yun,et al.Technical Analysis of Multi-transient Electromagnetic Method[J].Journal of Earth Sciences and Environment,2015,37(1):94-100.
[3] 底青云,朱日祥,薛国强,等.我国深地资源电磁探测新技术研究进展[J].地球物理学报,2019,62(6):2128-2138. DI Qing-yun,ZHU Ri-xiang,XUE Guo-qiang,et al.New Development of the Electromagnetic(EM)Methods for Deep Exploration[J].Chinese Journal Geopphysics,2019,62(6):2128-2138.
[4] 邓晓红,张 杰,武军杰,等.井中瞬变电磁方法技术及应用实例[R].廊坊:中国地质科学院地球物理地球化学勘察研究所,2016. DENG Xiao-hong,ZHANG Jie,WU Jun-jie,et al.Techniques and Application Examples of Transient Electromagnetic Methods in Wells[R].Langfang:Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,2016.
[5] WOODS D V.A Model Study of the Crone Borehole Pulse Electromagnetic(PEM)System[D].Kingston:Queen's University,1975.
[6] DUNCAN A C,CULL J P.Three-component Downhole TEM Surveys[J].Exploration Geophysics,1988,19(1/2):51-53.
[7] EATON P A,HOHMANN G W.The Influence of a Conductive Host on Two-dimensional Borehole Transient Electromagnetic Responses[J].Geophysics,1984,49(7):861-869.
[8] GUO J L,ZENG Y Q,LI X.Numerical Simulation Analysis of Surface-to-borehole TEM Based on the Finite Difference Method[C]∥SEG.International Workshop and Gravity:Electrical and Magnetic Methods and Their Applications.Chengdu:SEG,2015:30-32.
[9] 王 鹏,程建远,姚伟华,等.积水采空区地面-钻孔瞬变电磁探测技术[J].煤炭学报,2019,44(8):2502-2508. WANG Peng,CHENG Jian-yuan,YAO Wei-hua,et al.Technology of Detecting Water Filled Goaf Beside Borehole Using Downhole Transient Electromagnetic Method[J].Journal of China Coal Society,2019,44(8):2502-2508.
[10] 武军杰.地-井与地-空瞬变电磁联合解释方法研究[D].西安:长安大学,2018. WU Jun-jie.Study on Joint Interpretation of Borehole and Ground-airborne TEM Data[D].Xi'an:Chang'an University,2018.
[11] 王 鹏.井-地瞬变电磁法浮动系数空间交汇与等效电流环反演方法研究[D].武汉:中国地质大学,2017. WANG Peng.Study on Floating Coefficient Space Intersection and Equivalent Current Loop Inversion of Downhole TEM[D].Wuhan:China University of Geosciences,2017.
[12] 张 杰,邓晓红,郭 鑫,等.地-井TEM在危机矿山深部找矿中的应用实例[J].物探与化探,2013,37(1):30-34. ZHANG Jie,DENG Xiao-hong,GUO Xin,et al.Typical Cases of Applying Borehole TEM to Deep Pro-specting in Crisis Mines[J].Geophysical and Geoche-mical Exploration,2013,37(1):30-34.
[13] 段书新,刘文泉,许 幼,等.井中瞬变电磁纯异常提取方法及其在热液型铀矿勘查中的应用[J].世界核地质科学,2018,35(4):225-232. DUAN Shu-xin,LIU Wen-quan,XU You,et al.Pure Anomaly Extraction in BHTEM and Its Application in Exploration of Hydrothermal Uranium Deposit[J].World Nuclear Geoscience,2018,35(4):225-232.
[14] 姚伟华,王 鹏,李明星,等.地孔瞬变电磁法超前探测数值模拟响应特征[J].煤炭学报,2019,44(10):3145-3153. YAO Wei-hua,WANG Peng,LI Ming-xing,et al.Numerical Simulation Response Characteristics of Down Hole TEM for Advanced Detection[J].Journal of China Coal Society,2019,44(10):3145-3153.
[15] 范 涛.矿井巷道-钻孔瞬变电磁二维拟地震反演方法及应用[J].煤炭学报,2019,44(6):1804-1816. FAN Tao.Method and Application on 2D Pseudo-seismic Inversion of Roadway-borehole Transient Electromagnetic Detection in Coal Mine[J].Journal of China Coal Society,2019,44(6):1804-1816.
[16] YIN C C,FRASER D C.The Effect of the Electrical Anisotropy on the Response of Helicopter-borne Frequency-domain Electromagnetic Systems[J].Geophysical Prospecting,2004,52(5):399-416.
[17] 齐彦福,李 貅,殷长春,等.时间域航空电磁各向异性大地三维自适应有限元正演研究[J].地球物理学报,2020,63(6):2434-2448. QI Yan-fu,LI Xiu,YIN Chang-chun,et al.Three-dimensional Adaptive Finite-element Method for Time-domain Airborne EM over an Anisotropic Earth[J].Chinese Journal of Geophysics,2020,63(6):2434-2448.
[18] 刘百祥,孙 喆,袁永榜.地-井瞬变电磁法线性导体正演及异常响应特征研究[J].煤炭科学技术,2019,47(6):187-191. LIU Bai-xiang,SUN Zhe,YUAN Yong-bang.Study on Linear Conductor Forward Modeling and Characteristics of Abnormal Response in Ground-well TEM[J].Coal Science and Technology,2019,47(6):187-191.
[19] 李大俊,翁爱华,杨 悦,等.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. LI Da-jun,WENG Ai-hua,YANG Yue,et al.Three-dimension Forward Modeling and Characteristics for Surface-borehole Transient Electromagnetic by Using Staggered-grid Finite Difference Method[J].Journal of Jilin University(Earth Science Edition),2017,47(5):1552-1561.
[20] MENG Q X,HU X Y,PAN H P,et al.Numerical Analysis of Multicomponent Responses of Surface-hole Transient Electromagnetic Method[J].Applied Geophysics,2017,14(1):175-186.
[21] 杨海燕,徐正玉,岳建华,等.覆盖层下三维板状体地-井瞬变电磁响应[J].物探与化探,2016,40(1):190-196. YANG Hai-yan,XU Zheng-yu,YUE Jian-hua,et al.3D Inclined Conductor Behavior of Down-hole Transient Electromagnetic Method with Overburden Layer[J].Geophysical and Geochemical Exploration,2016,40(1):190-196.
[22] 徐正玉,杨海燕,邓居智,等.基于异常场的地-井瞬变电磁法正演研究[J].物探与化探,2015,39(6):1176-1182. XU Zheng-yu,YANG Hai-yan,DENG Ju-zhi,et al.Research on Forward Simulation of Down-hole TEM Based on the Abnormal Field[J].Geophysical and Geochemical Exploration,2015,39(6):1176-1182.
[23] 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 Qing-xin,PAN He-ping.Numerical Simulation Analysis of Surface-hole TEM Responses[J].Chinese Journal of Geophysics,2012,55(3):1046-1053.
[24] 周建美,刘文韬,李 貅,等.双轴各向异性介质中回线源瞬变电磁三维拟态有限体积正演算法[J].地球物理学报,2018,61(1):368-378. ZHOU Jian-mei,LIU Wen-tao,LI Xiu,et al.Research on the 3D Mimetic Finite Volume Method for Loop-source TEM Response in Biaxial Anisotropic Formation[J].Chinese Journal of Geophysics,2018,61(1):368-378.
[25] 刘亚军,胡祥云,彭荣华,等.回线源瞬变电磁法有限体积三维任意各向异性正演及分析[J].地球物理学报,2019,62(5):1954-1968. LIU Ya-jun,HU Xiang-yun,PENG Rong-hua,et al.3D Forward Modeling and Analysis of the Loop-source Transient Electromagnetic Method Based on the Finite-volume Method for an Arbitrarily Aniso-tropy Medium[J].Chinese Journal of Geophysics,2019,62(5):1954-1968.
[26] 程久龙,黄少华,温来福,等.矿井全空间三维主轴各向异性介质瞬变电磁场响应特征研究[J].煤炭学报,2019,44(1):278-286. CHENG Jiu-long,HUANG Shao-hua,WEN Lai-fu,et al.Response Characteristics of Three-dimensional Axial Anisotropic Media for Transient Electromagnetic Method in Underground Whole-space[J].Journal of China Coal Society,2019,44(1):278-286.
[27] 刘云鹤,殷长春,蔡 晶,等.电磁勘探中各向异性研究现状和展望[J].地球物理学报,2018,61(8):3468-3487. LIU Yun-he,YIN Chang-chun,CAI Jing,et al.Review on Research of Electrical Anisotropy in Electromagnetic Prospecting[J].Chinese Journal of Geophysics,2018,61(8):3468-3487.
[28] 武军杰,智庆全,李 貅,等.定源回线瞬变电磁三分量纯异常三维反演方法[J].地球物理学进展,2015,30(6):2827-2835. WU Jun-jie,ZHI Qing-quan,LI Xiu,et al.3D Inversion Method of Fixed-loop TEM with Three-component Anomaly Response[J].Progress in Geophysics,2015,30(6):2827-2835.
[29] 孙怀凤,程 铭,吴启龙,等.瞬变电磁三维FDTD正演多分辨网格方法[J].地球物理学报,2018,61(12):5096-5104. SUN Huai-feng,CHENG Ming,WU Qing-long,et al.A Multi-scale Grid Scheme in Three-dimensional Transient Electromagnetic Modeling Using FDTD[J].Chinese Journal of Geophysics,2018,61(12):5096-5104.
[30] 郭建磊.阵列源瞬变电磁法隧道高分辨超前探测研究[D].西安:长安大学,2017. GUO Jian-lei.Transient Electromagnetic Method Using Source Array for Tunneling Ahead Geological Prospecting of High Resolution[D].Xi'an:Chang'an University,2017.

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Last Update: 2020-12-20