圆锥型场源瞬变电磁法试验研究  

Experimental study on transient electromagnetic method with a conical source

作　　者：杨海燕[1] 刘志新[1] 张华 陈晓 李哲 汪凌 杨夫杰 YANG Haiyan;LIU Zhixin;ZHANG Hua;CHEN Xiao;LI Zhe;WANG Ling;YANG Fujie(School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;School of Geophysics and Measurement-Control Technology,East China University of Technology,Nanchang 330013,China)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]东华理工大学地球物理与测控技术学院,江西南昌330013

出　　处：《煤田地质与勘探》2021年第6期107-112,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41974086,41974128,41874126)。

摘　　要：圆锥型场源是一种新型瞬变电磁发射装置,前期理论研究结果显示该装置具有诸多优点。为了进一步验证该装置的实际探测能力,制作了2种装置在地面和煤矿巷道两种环境下开展了试验研究。地面试验结合高密度电阻率法的探测成果,将圆锥型场源和多匝小回线的探测结果进行比较,结果显示,圆锥型场源对不同地层的电性特征刻画更为准确,识别出的1条断层与高密度电阻率成果更为吻合。矿井超前探测试验结果显示,圆锥型场源的低阻区划分更为精细,尤其在工作面方向显示出更强的低阻分辨能力,多匝小回线探测成果中存在1个低阻连通区,经圆锥型场源探测证实为2个不连通的低阻异常。此外,圆锥型场源的发射和接收线框形状和面积更为稳定,对提升瞬变电磁法工作效率和数据质量有较大的帮助。A new transmitter device-conical source has been proved theoretically to have several advantages for transient electromagnetic sounding. To verify application ability of conical source, two kinds of transmitter devices were designed and made, and the experimental studies on surface and in mine roadway were carried out. By applying high density resistivity achievements in surface experiment, the detecting results using conical source and multi-coils were compared. The results show that the description of strata resistivity with conical source is better than that with multi-coils. One fault was identified and the strike and position of which matches the high density resistivity result better. Meanwhile, experiment results in mine roadway also show that the conical source can achieve more effective delineation of low resistivity zone than multi-coils;the low resistivity zone in multi-coils section was turned out to be two discontinuous areas in conical source section. In addition, the conical source has a higher resolution of conductor in mine drift. The shape and area of conical source are more stable, which is more helpful to improve the efficiency and data quality of the transient electromagnetic method.

关 键 词：瞬变电磁法 圆锥型场源 高密度电阻率法 视电阻率 超前探测 

分 类 号：P631[天文地球—地质矿产勘探]