瞬变电磁法理论的探测深度问题  

Theoretical depth of investigation of transient electromagnetic method

作　　者：吴信民[1] 张振坤[1] 徐剑波[1] 

机构地区：[1]东华理工大学,抚州344000

出　　处：《地球物理学进展》2015年第3期1333-1336,共4页Progress in Geophysics

基　　金：国家自然科学基金(41174107)项目;国家国防科工局三废退役治理项目(科工二司[2011]1081号)联合资助

摘　　要：本文在给出了瞬变电磁法理论探测深度的定义和考虑了各种干扰等因素的基础上,用电位异常方法计算了瞬变电磁法中的理论探测深度,分析了瞬变电磁法中理论探测深度与线框边长、供电电流和干扰感应电压之间的关系.研究结果表明,如果使用中心回线装置,只考虑发射线框边长发生变化,而其它因素不变时,理论探测深度首先会随着线框边长的增大而增大,当线框增大到在某一值时,理论探测深度达到最大.再增大线框时,理论探测深度反而会减小.First of all, it was defined that the theoretical depth of investigation of transient electromagnetic method. On the basis of considering the interference factors, it is used that potential anomalies to calculate the theoretical depth of investigation of transient electromagnetic method. It have calculated that the relationship between the theoretical depth of investigation and transmitter coil length, disturbance voltage, transmitter current and the number of coils. Only considering the changes of transmitter coil length, the theoretical depth of investigation increases with the increasing transmitter coil length when the others keep constant. Within a certain range, the theoretical depth of investigation reach the deepest. However , with the increase of coil length, the theoretical depth of investigation will decline.

关 键 词：瞬变电磁法 理论探测深度 电位异常 

分 类 号：P631[天文地球—地质矿产勘探]