环形源形状对时间域电磁响应的影响分析  

Analysis of the affection for the electromagnetic response of the shape variation of the loop source

作　　者：李耀恩 吴云鹏[2] 吴小平[3] 

机构地区：[1]内蒙古自治区第一水文地质工程地质勘查院,呼和浩特010020 [2]成都信息工程学院计算机学院,成都610225 [3]中南大学地球科学与信息物理学院,长沙410083

出　　处：《地球物理学进展》2014年第1期418-422,共5页Progress in Geophysics

基　　金：国家自然科学基金(41174103);博士点基金(20070533075)联合资助

摘　　要：时间域电磁测深方法中,重叠回线、中心回线和大定源等回线源装置,因其非接地、近场源观测、小装置等优势被广泛应用.但野外观测中,回线布设时由于野外地形条件的限制,往往不能布置成规则形状,回线源的形状对其时间域电磁响应的影响就自然成为一个非常重要因素.作者在文中通过对圆形源、正方形源和正三角形源等回线源的中心点的时间域电磁响应分别按等周长和等面积计算分析,发现任意形状回线源中心点的时间域电磁响应与回线源的形状无关,而是与回线源所包围的面积成正比.并由此推断,任意形状回线源中心点时间域电磁响应观测数据的处理,可以采取等面积圆形回线源的等效处理与解释.The Overlap Loop, Central Loop and Fixed Loop are widely used for Time Domain Electromagnetic Sounding because of their non-grounding, near source and small installation superiority. It is very hard to lay a regulation Loop in the field condition because of restriction of field topography. So it is important for analysis of the effects by the variation shape of Loop source. The author found that the central point EM response of Loop source is independent of the shape variation of Loop source and direct ratio to the area of Loop source by the compare of calculating results of circle Loop source, Square Loop source and Triangle Loop source. And get conclusion： it can be processed and interpreted by using Circle Loop source equivalent processing for variation Loop source but the same area.

关 键 词：时间域 电磁测深 回线源 偶极源 电磁响应 

分 类 号：P631[天文地球—地质矿产勘探]