«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

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

卷:

第44卷

期数:

2022年第02期

页码:

338-351

栏目:

应用地球物理

出版日期:

2022-03-15

文章信息/Info

Title:

Effect of Topographic Relief Outside the Large Loop Source in Transient Electromagnetic Exploration

文章编号:

1672-6561(2022)02-0338-14

作者:

饶丽婷¹; 武 欣²; 党 博¹; 党瑞荣¹; 李 勇³

(1. 西安石油大学 电子工程学院,陕西 西安 710065; 2. 中国科学院地质与地球物理研究所中国科学院矿产资源研究重点实验室,北京 100029; 3. 北京中科地垣科技有限公司,北京 100190)

Author(s):

RAO Li-ting¹;  WU Xin²;  DANG Bo¹;  DANG Rui-rong¹;  LI Yong³

(1. School of Electronic Engineering, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China; 2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Beijing Zhongke Diyuan Technology Co., Ltd., Beijing 100190, China)

关键词:

瞬变电磁法;  大回线源;  地形;  三维正演;  有限元法;  异常体;  电导率;  数值模拟

Keywords:

transient electromagnetic method;  large loop source;  topography;  three-dimensional forward;  finite element method;  anomaly;  conductivity;  numerical simulation

分类号:

P631

DOI:

10.19814/j.jese.2021.08021

文献标志码:

A

摘要:

起伏地形为中国矿产资源的发现和勘查造成了极大困难,为了避免复杂的地形效应,在地面瞬变电磁勘探中尽量将发射源与接收点布置在地形平缓处,但源外起伏地形的影响仍然存在。目前,对地形影响的分析大多从测道曲线图或者视电阻率断面图进行定性判断,较少从整个观测时间段内量化评估地形影响的程度。基于有限元法实现了带地形条件下矩形回线源的瞬变电磁三维正演,在源外构造了山脊、山谷地形,将地形与发射源的距离、大地电导率、异常体电导率作为变化参数,给出了整个观测时间段内在不同接收点处地形造成的相对误差分布,从而分析了源外地形对电磁响应的影响规律。结果表明:源外地形对电磁响应的影响主要集中在某个时间段内,随着与发射源距离增大,地形作用减弱,受影响区域也推移到较晚期时间段上; 随着大地电导率增大,地形主要影响区域会推移到较晚期时间上,但受影响程度基本一致; 相同几何尺寸的山谷地形比山脊地形对电磁响应的影响更大; 地形、异常体对电磁响应的影响可以分离,如果异常体产生的二次场比较强,地形效应的影响相对较小,可以忽略地形影响。研究结果为地面瞬变电磁勘探中地形效应的识别与后期处理解释提供了理论依据。

Abstract:

The topographic relief has caused great difficulties for the discovery and exploration of mineral resources in China. The calculation and interpretation of transient electromagnetic(TEM)data are often based on flat terrain. The topography can change the distribution of TEM response, which results in some error in recognition of underground targets. To avoid the complex influence of topographic effect, the transmitting source and observation point are normally laid on the flat terrain as possible, but the topography outside the source still impacts on TEM response. In recent years, most of the studies of topographic effect are based on the response curve or apparent resistivity section, while quantitatively evaluations of the degree by topography in the whole observation period are relatively few. The vector finite element method was adopted to perform the three-dimensional forward TEM problems with topography. The model containing topography of ridge and valley were constructed, and the distance between the topography and source, the conductivity of the earth and the anomaly were taken as variable parameters. The effects of topographic relief were investigated through the comparisons of different models. The results show that the topographic effects on EM response mainly reflect in a certain time period, and the topographic effect becomes weaker, the affected area on EM response moves to a later time period as the distance between the topography and source increases; with the increase of earth conductivity, the main affected area of topography on EM response moves to a later time period, but the degree of impact remains the same basically; the influence of valley topography on EM response is greater than that of ridge topography with the same geometric size; the influence of topography and anomaly on EM response can be separated; if the secondary field generated by anomaly is strong enough, the influence of topographic effect can be ignored. The research conclusions provide theoretical basis for the identification and processing of topographic effect in ground TEM exploration.

参考文献/References:

[1] 薛国强,闫 述,底青云,等.多道瞬变电磁法(MT-EM)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.
[2] RAO L T,GAO J S,WU X,et al.A Simple and Robust Total Variation Based Inversion Scheme for Transient Electromagnetic Data[J].IEEE Access,2020,8:16539-16549.
[3] WU X,XUE G Q,HE Y M,et al.Removal of the Multi-source Noise in Airborne Electromagnetic Data Based on Deep Learning[J].Geophysics,2020,85(6):193-208.
[4] 常江浩,薛国强.电性源短偏移距瞬变电磁场扩散规律三维数值模拟[J].地球科学与环境学报,2020,42(6):711-721.
CHANG Jiang-hao,XUE Guo-qiang.Three-dimensional Numerical Simulation of Diffusion Law of Sho-rt-offset Grounded-wire Transient Electromagnetic Field[J].Journal of Earth Sciences and Environment,2020,42(6):711-721.
[5] 邱卫忠.回线源TEM山地勘探中的地形影响和校正方法[J].煤田地质与勘探,2012,40(5):78-81.
QIU Wei-zhong.Topographic Effects and Correction Methods of Loop Source TEM in Mountainous Exploration[J].Coal Geology and Exploration,2012,40(5):78-81.
[6] 殷长春,张 博,刘云鹤,等.2.5维起伏地表条件下时间域航空电磁正演模拟[J].地球物理学报,2015,58(4):1411-1424.
YIN Chang-chun,ZHANG Bo,LIU Yun-he,et al.2.5-D Forward Modeling of the Time-domain Airborne EM System in Areas with Topographic Relief[J].Chinese Journal of Geophysics,2015,58(4):1411-1424.
[7] 张 博,殷长春,刘云鹤,等.起伏地表频域/时域航空电磁系统三维正演模拟研究[J].地球物理学报,2016,59(4):1506-1520.
ZHANG Bo,YIN Chang-chun,LIU Yun-he,et al.3D Modeling on Topographic Effect for Frequency-/Time-domain Airborne EM Systems[J].Chinese Jour-nal of Geophysics,2016,59(4):1506-1520.
[8] 赵 越,李 貅,王炜鹏,等.三维起伏地形条件下航空瞬变电磁响应特征研究[J].地球物理学报,2017,60(1):383-402.
ZHAO Yue,LI Xiu,WANG Wei-peng,et al.Characteristics of Terrain Effect for 3-D ATEM[J].Chinese Journal of Geophysics,2017,60(1):383-402.
[9] 薛国强,闫 述,陈卫营.电磁测深数据地形影响的快速校正[J].地球物理学报,2016,59(12):4408-4413.
XUE Guo-qiang,YAN Shu,CHEN Wei-ying.A Fast Topographic Correction Method for Electromagnetic Data[J].Chinese Journal of Geophysics,2016,59(12):4408-4413.
[10] 曹凤凤.地空瞬变电磁起伏地形效应的特征研究[D].西安:长安大学,2019.
CAO Feng-feng.Study on Characteristics of Rugged Terrain Effect of Ground-airborne Transient Electromagnetic[D].Xi'an:Chang'an University,2018.
[11] 齐彦福,智庆全,李 貅,等.考虑关断时间的地面瞬变电磁三维带地形反演[J].地球物理学报,2021,64(7):2566-2577.
QI Yan-fu,ZHI Qing-quan,LI Xiu,et al.Three-dimensional Ground TEM Inversion over a Topographic Earth Considering Ramp Time[J].Chinese Journal of Geophysics,2021,64(7):2566-2577.
[12] 霍军鹏.倾斜地形对TEM影响分析及其校正方法[J].陕西煤炭,2021,40(5):108-112.
HUO Jun-peng.Analysis of the Influence of Inclined Terrain on TEM and Its Correction Method[J].Shaanxi Coal,2021,40(5):108-112.
[13] 薛国强,常江浩,雷康信,等.瞬变电磁法三维模拟计算研究进展[J].地球科学与环境学报,2021,43(3):559-567.
XUE Guo-qiang,CHANG Jiang-hao,LEI Kang-xin,et al.Review on Three-dimensional Simulations of Transient Electromagnetic Field[J].Journal of Earth Sciences and Environment,2021,43(3):559-567.
[14] NEWMAN G A,HOHMANN G W,ANDERSON W L.Transient Electromagnetic Response of a Three-dimensional Body in a Layered Earth[J].Geophysics,1986,51(8):1608-1627.
[15] XIONG Z H,TRIPP A C.A Block Iterative Algorithm for 3-D Electromagnetic Modeling Using Integral Equations with Symmetrized Substructures[J].Geophysics,1995,60(1):291-295.
[16] ZHDANOV M S,LEE S K,YOSHIOKA K.Integral Equation Method for 3D Modeling of Electromagnetic Fields in Complex Structures with Inhomogeneous Background Conductivity[J].Geophysics,2006,71(6):333-345.
[17] WANG T,HOHMANN G W.A Finite-difference Time-domain Solution for Three-dimensional Electromagnetic Modeling[J].Geophysics,1993,58(6):797-809.
[18] UM E S,HARRIS J M,ALUMBAUGH D L.3D Ti-me-domain Simulation of Electromagnetic Diffusion Phenomena:A Finite-element Electric-field Approach[J].Geophysics,2010,75(4):115-126.
[19] 孙怀凤,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 Huai-feng,LI Xiu,LI Shu-cai,et al.Three-dimensional FDTD Modeling of TEM Excited by a Lo-op Source Considering Ramp Time[J].Chinese Journal of Geophysics,2013,56(3):1049-1064.
[20] LI J H,FARQUHARSON C G,HU X Y.3D Vector Finite-element Electromagnetic Forward Modeling for Large Loop Sources Using a Total-field Algorithm and Unstructured Tetrahedral Grids[J].Geophysics,2017,82(1):1-16.
[21] QI Y Z,EL-KALIOUBY H,REVIL A,et al.Three-dimensional Modeling of Frequency- and Time-domain Electromagnetic Methods with Induced Polarization Effects[J].Computer and Geosciences,2019,124:85-92.
[22] 李 貅,胡伟明,薛国强.多辐射源地空瞬变电磁响应三维数值模拟研究[J].地球物理学报,2021,64(2):716-723.
LI Xiu,HU Wei-ming,XUE Guo-qiang.3D Modeling of Multi-radiation Source Semi-airborne Transient Electromagnetic Response[J].Chinese Journal of Geophysics,2021,64(2):716-723.
[23] 张永超,王光杰,李宏杰,等.基于吸收边界条件的瞬变电磁法三维矢量有限元快速正演[J].地球物理学报,2021,64(3):1106-1118.
ZHANG Yong-chao,WANG Guang-jie,LI Hong-jie,et al.Efficient 3D Vector Finite Element Modeling for TEM Based on Absorbing Boundary Condition[J].Chinese Journal of Geophysics,2021,64(3):1106-1118.
[24] HABER E,ASCHER U M,OLDENBURG D W.Inversion of 3D Electromagnetic Data in Frequency and Time-domain Using an Inexact All-at-once Approach[J].Geophysics,2004,69(5):1216-1228.
[25] 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.
[26] HABER E,ASCHER U M,ARULIAH D A,et al.Fast Simulation of 3D Electromagnetic Problems Us-ing Potentials[J].Journal of Computational Physics,2000,163(1):150-171.
[27] 胡祥云,李建慧,彭荣华.时间域电磁法勘探的正演问题研究[M].北京:科学出版社,2019.
HU Xiang-yun,LI Jian-hui,PENG Rong-hua.Resear-ch on Forward Modeling of Time Domain Electromagnetic Method[M].Beijing:Science Press,2019.

相似文献/References:

[1]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(01):94.
　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(02):94.
[2]雷康信,薛国强*,陈卫营,等.瞬变电磁法探测薄层的分辨能力与偏移距关系[J].地球科学与环境学报,2020,42(06):731.[doi:10.19814/j.jese.2020.07044]
　LEI Kang-xin,XUE Guo-qiang*,CHEN Wei-ying,et al.Relationship Between the Detection Capability and Offset of Transient Electromagnetic Method for Thin Layers[J].Journal of Earth Sciences and Environment,2020,42(02):731.[doi:10.19814/j.jese.2020.07044]
[3]薛国强,常江浩*,雷康信,等.瞬变电磁法三维模拟计算研究进展[J].地球科学与环境学报,2021,43(03):559.[doi:10.19814/j.jese.2020.11029]
　XUE Guo-qiang,CHANG Jiang-hao*,LEI Kang-xin,et al.Review on Three-dimensional Simulations of Transient Electromagnetic Field[J].Journal of Earth Sciences and Environment,2021,43(02):559.[doi:10.19814/j.jese.2020.11029]
[4]陈卫营,薛国强.电性源短偏移距瞬变电磁法数据处理软件系统SOTEMsoft[J].地球科学与环境学报,2021,43(06):1050.[doi:10.19814/j.jese.2021.07003]
　CHEN Wei-ying,XUE Guo-qiang.Data Processing Software SOTEMsoft for Electric Source Short-offset Transient Electromagnetic Method[J].Journal of Earth Sciences and Environment,2021,43(02):1050.[doi:10.19814/j.jese.2021.07003]
[5]石金晶,薛国强*,陈卫营,等.水平大定源回线瞬变电磁任意点一维正反演[J].地球科学与环境学报,2022,44(05):860.[doi:10.19814/j.jese.2021.12029]
　SHI Jin-jing,XUE Guo-qiang*,CHEN Wei-ying,et al.One-dimensional Forward and Inversion for an Arbitrary Point of Horizontal Large-loop Fixed Source Transient Electromagnetism[J].Journal of Earth Sciences and Environment,2022,44(02):860.[doi:10.19814/j.jese.2021.12029]
[6]杨海燕,宋立伟,储丹华*,等.斜井层状介质孔中时间域电磁张量响应特征[J].地球科学与环境学报,2023,45(03):760.[doi:10.19814/j.jese.2022.12063]
　YANG Hai-yan,SONG Li-wei,CHU Dan-hua*,et al.Tensor Response Characteristics of Time-domain Electromagnetic Field in a Layered Medium with a Deviated Well[J].Journal of Earth Sciences and Environment,2023,45(02):760.[doi:10.19814/j.jese.2022.12063]

备注/Memo

备注/Memo:

收稿日期:2021-08-11; 修回日期:2021-09-26投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(42074121,42004064,41874158); 陕西省教育厅专项科研计划项目(19JK0669);
陕西省创新人才推进计划项目(2020KJXX-018); 陕西省高校科协青年人才托举计划项目(20210702)
作者简介:饶丽婷(1989-),女,湖北武穴人,讲师,工学博士,E-mail:ltrao@xsyu.edu.cn。

常用功能

更新日期/Last Update: 2022-04-30