|
|
Research on response of ground-borehole TEM |
Hong-Chun YI |
Chongqing Research Institute of China Coal Technology and Engineering Group,Chongqing 400037,China |
|
|
Abstract As a device form of transient electromagnetic method, the ground-borehole TEM is being studied by more and more experts both in China and abroad. It has such advantages as small electromagnetic interference,strong signal for its receiving probe in the drilling or downhole tunnel, and closeness to the target anomaly. In this paper, the author used loop source as the excitation source, and established the geological model using finite-difference time-domain method (FDTD) with plate-like body and rectangular low-resistance body. The author calculated the transient response of the rectangular loop source ground-borehole TEM in the half space, and studied its characteristics and laws from the perspective of ground-borehole observation and ground-tunnel observation. The results show that, when multiple anomalies exist simultaneously, the ground-borehole TEM can distinguish different anomalies from the anomalous body and can accurately locate the depth and the horizontal position of different anomalies. The results can provide reference for the quantitative explanation of the depth and location of the anomaly with ground-borehole TEM.
|
Received: 28 February 2017
Published: 24 October 2018
|
|
|
|
|
[1] |
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.
|
[2] |
West R C, Ward S H . The borehole transient electromagnetic response of a three-dimensional fracturezone in a conductive half-space[J]. Geophysics, 1988,53(11):1469-1478.
|
[3] |
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.
|
[4] |
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]. 中国矿大学报, 2014,43(6):1113-1119.
|
[5] |
徐正玉, 杨海燕, 邓居智 . 垂直接触带影响下地-井瞬变电磁响应研究 [J]. 地球物理学进展, 2015,30(3):1345-1353
|
[6] |
徐正玉, 杨海燕, 邓居智 , 等. 回线源三维地-井瞬变电磁法FDTD数值模拟 [J]. 工程地球物理学报, 2015,3:327-332.
|
[7] |
杨海燕, 岳建华, 徐正玉 . 覆盖层影响下典型地-井模型瞬变电磁法正演 [J]. 吉林大学学报:地球科学版, 2016,46(5):1527-1537.
|
[8] |
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.
|
[9] |
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.
|
[10] |
岳建华, 杨海燕 . 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.
|
[11] |
杨海燕, 岳建华 . 磁偶源2.5维瞬变电磁场全空间FDTD数值模拟[J]. 物探与化探, 2008,32(3):326-330.
|
[12] |
葛德彪 . 电磁波时域有限差分方法[M]. 西安: 西安电子科技大学出版社, 2002.
|
[13] |
Greenfield R J, Wu S T . Electromagnetic wave propagationin disrupted coal seams[J]. Geophysics, 1991,56(10):1571-1577.
|
[1] |
ZHANG Jian-Zhi, HU Fu-Hang, LIU Hai-Xiao, XING Guo-Zhang. TEM response characteristics of borehole in goaves of old coal mines[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 191-197. |
[2] |
XIAO Yan-Shan, ZHOU Zheng-Hua, SU Jie, WEI Xin. Discussion about the theoretical basis of the down-hole method for shear wave velocity test under surface forward and reverse horizontal hammer strikes[J]. Geophysical and Geochemical Exploration, 2021, 45(5): 1288-1294. |
|
|
|
|