探测地下管线接口的频率域电磁法研究  

Research of electro-magnetic spectrum method prospecting underground pipeline joint

作　　者：裴建新[1] 张维冈[1] 贺懿[1] 韩波[2] 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]中国科学院海洋研究所,山东青岛266071

出　　处：《中国石油大学学报（自然科学版）》2007年第3期54-58,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金资助项目(40574053)

摘　　要：根据频率域中感应法探测金属管线的二次磁场分布,分析了感应电流形成机理和传输特征,讨论了由管线深度变化引起的异常规律。研究结果表明,频率域电磁法探测地下金属管线时,由于信号受金属管线内部电流线场的影响,管线接口的非金属介质将导致观测信号衰减。针对这种信号衰减在探测结果中易与管线变深处异常特征混淆的问题,提出了运用比值参数对两种异常有效地加以区分的方法。Based on the secondary magnetic distribution characters in frequency domain, the formation and transmission characters of faradic current were analyzed and the abnormal regularity resulting from pipeline depth change was discussed. The results indicate that when electromagnetic method is used to detect underground metal pipelines in frequency domain, the non-metal joint of mental pipeline may cause the decay of observed signals because of the influence of the inner current of mental pipelines. This phenomenon is easy to be confused with the abnormal characters resulting from depth variation. This study demonstrates that the two kinds of abnormals can be differentiated effectively by the ratio parameter method.

关 键 词：频率域电磁法 地下管线 管线接口 磁异常 

分 类 号：P631.325[天文地球—地质矿产勘探]