瞬变电磁全区视电阻率数值计算方法研究  

STUDY ON NUMERICAL CALCULATION METHODS OF TRANSIENT ELECTROMAGNETIC ALL-TIME APPARENT RESISTIVITY

作　　者：郭嵩巍[1] 王绪本[1] 

机构地区：[1]成都理工大学信息工程学院,成都610059

出　　处：《物探化探计算技术》2010年第5期500-507,455,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家863高技术研究发展计划项目(2006AA06A205-5)

摘　　要：基于均匀半无限介质空间中场的表达式,给出了一维层状介质中心回线装置瞬变电磁测深法的全区视电阻率定义,研究了三种全区视电阻率的数值计算方法。特别是在计算的过程中,利用分段计算,解决了全区视电阻率解的非唯一性问题。同时引入二分查找法,解决了隐函数的反函数求解问题。通过正演建模和烟圈反演,进一步对比分析了三种计算方法,这在瞬变电磁测深资料的定性解释中,正确反映地下一维电性层电性垂向的变化特征具有重要的意义。In this paper,the definition of all-time apparent resistivity is introduced for central-loop transient electromagnetic method in homogeneous half-space.Three numerical calculation mehtods have been studied.Especially by using time segmentation calculation,the non-uniqueness of all-time apparent resistivity solution has been solved,and the method of binary-search is also introduced to solve the inverse function of implicit function.A comparison and analysis has been carried out for the three numerical calculation methods through forward modeling and smoke loop inversion,and it would play an important role in revealing the vertical variations of rock-electrical layer of the qualitative interpretation of transient electromagnetic data.

关 键 词：瞬变电磁法 全区视电阻率 二分查找 烟圈反演 

分 类 号：P631.325[天文地球—地质矿产勘探]