陈丁^1,2,,
程久龙^1,,,
王阿明²
1. 中国矿业大学(北京)地球科学与测绘工程学院, 北京 100083
2. 徐州医科大学公共教育学院, 江苏徐州 221004

基金项目: 国家重点研发计划资助（2017YFC0804105），国家自然科学基金资助项目（51574250），徐州医科大学优秀人才科研启动基金（D2017018）联合资助


详细信息

作者简介: 陈丁, 男, 1985年生, 博士研究生, 讲师, 主要从事应用地球物理电磁法研究.E-mail:chending224@163.com

通讯作者: 程久龙, 男, 1965年生, 教授, 博士生导师, 主要从事应用地球物理理论与方法研究.E-mail:jlcheng@126.com

中图分类号: P631

收稿日期:2017-12-07
修回日期:2018-04-24
上线日期:2018-10-05

Numerical simulation of drillhole transient electromagnetic response in mine roadway whole space using integral equation method

CHEN Ding^1,2,,
CHENG JiuLong^1,,,
WANG AMing²
1. College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
2. School of Basic Education, Xuzhou Medical University, Jiangsu Xuzhou 221004, China


More Information

Corresponding author: CHENG JiuLong,E-mail:jlcheng@126.com

MSC: P631

--> Received Date: 07 December 2017
Revised Date: 24 April 2018
Available Online: 05 October 2018


摘要
摘要:基于地面-钻孔瞬变电磁法，将发射源布设于煤矿巷道中，而将接收探头放置在钻孔内，从上至下依次观测，形成矿井巷道-钻孔瞬变电磁法.为了研究巷道全空间条件下巷道-钻孔瞬变电磁场的响应特征，选取煤层底板受水害威胁的代表性地层为研究对象，建立煤层底板存在含水低阻地质异常体的三维数学模型，采用积分方程法进行数值模拟，结果表明：相对高阻的煤层侧帮对孔内垂向感应电动势的影响较小，而对孔内水平感应电动势除浅部约30 m内影响相对较大外，对深部影响较小.当煤层底板含水平低阻板状异常体时，在对异常体的纵向分辨率和异常响应的延续时间方面，孔内感应电动势的水平分量相对优于垂向分量，但垂向感应电动势的幅值强于水平感应电动势.因此，实际观测时，不仅要观测孔内感应电动势的垂向分量，也要观测水平分量.
关键词: 矿井巷道-钻孔瞬变电磁/
全空间/
低阻地质异常体/
积分方程法/
三维数值模拟

Abstract:Borehole transient electromagnetic method (BHTEM) is operated in mine roadway. The source of BHTEM is laid in mine roadway and receiver is placed in drill hole, observation is carried out in turn from top to bottom. In order to study the response characteristics of BHTEM in roadway whole space, numerical simulation is carried out using integral equation method (IEM) based on 3D mathematical model in which the representative stratum of the coal seam floor under the threat of water hazard is selected as the research object and coal seam floor contains water bearing abnormal body. The transient electromagnetic (TEM) response characteristics are analyzed. The numerical simulation results show that the coal seam on both sides of the roadway has little influence on the vertical induction electromotive force response, when its resistivity is greater than that of coal roof and floor. While it has relatively great influence on the horizontal induction electromotive force responses of stations located in the shallow part within 30 meters and it has little influence on the horizontal responses of stations located in the deep. When coal seam floor contains horizontal low resistivity plate-like abnormal body, the horizontal component of the induction electromotive force is relatively superior to the vertical component in drill hole in terms of vertical resolution and the duration of the abnormal response of the abnormal body. While the amplitude of the vertical induction electromotive force is stronger than that of the horizontal induction electromotive force. So, not only the vertical component of the induced electromotive force in the borehole but also the horizontal component needs to be observed in actual observation.
Key words:Mine roadway-drillhole transient electromagnetic/
Whole space/
Low resistivity geological anomaly/
Integral equation method/
Three dimensional numerical simulation



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