均匀半空间中心回线瞬变电磁法正演研究  

Research on the Center Loop Transient Electromagnetic Method in Homogeneous Half Space

作　　者：晏冲为[1] 李文尧[1] 

机构地区：[1]昆明理工大学国土资源与工程学院,昆明650093

出　　处：《科学技术与工程》2012年第9期2128-2131,共4页Science Technology and Engineering

基　　金：地质调查项目(1212011121273)资助

摘　　要：通过对均匀半空间中心回线装置瞬变电磁法表达式分析,可以为瞬变电磁法的反演提供理论正演数据、可以为瞬变电磁法的反演提供一定的方法,同时还可以为野外生产设计与室内数据筛选与剔除提供一定的参考。通过一个反演实例说明在晚期微小的二次电位误差将对视电阻率的计算产生很大的影响。编制了matlab程序计算各种工作装置和视电阻率理论正演二次电位衰减到噪声影响程度高的准确时间。对工程设计、评价视电阻计算的准确度及剔除受噪声影响严重的数据有一定的参考性。Analyzing the expression of the center loop transient electromagnetic method in homogeneous half space can provide the forward datas,the method of inversion and can select the correct datas or delete the wrong datas.An example of inversion is given which shows that the small secondary potential errors will have a greater impact on calculating all-time apparent resistivity in later time than in early time. Matlab program is drawn up to calculate the accurate time of secondary potential attenuating to the level affected by noise seriously. a reference for engineering design can be provided evaluating the calculation of all-time apparent resistivity and deleting the data affected by noise seriously.

关 键 词：中心回线瞬变电磁法 二次电位 衰减时间 

分 类 号：P631.34[天文地球—地质矿产勘探]