摘要
目前大地电磁测深法的一维正演理论,是基于平面波垂直入射水平层状介质的假设模型。但由于地球是一个球体,因此有必要研究基于球状介质模型的大地电磁正演理论。这里详细推导了基于球体层状介质模型的大地电磁正演公式,计算了若干理论模型。通过同基于水平层状介质模型的大地电磁正演结果对比,验证了正演公式的正确性。同时,指出当探测周期增加到上万秒时,阻抗相位会增大;而当探测周期增加到数十万秒时,视电阻率会减小。
MT 1D forward theory is based on horizontal layered model now,but it is necessary to study the MT 1D forward theory based on layered sphere model because the earth is a sphere.This paper gives the MT 1D forward formula based on layered sphere model and calculates some models.The forward formula is proved to be correct by the contrast between the layered sphere model and horizontal layered model,Theoretical analysis shows that the phase will increase when the period is up to 104s and the apparent resistivity will decline when the period is up to 105s.
出处
《物探化探计算技术》
CAS
CSCD
2012年第4期384-389,365,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家自然科学基金(4084102
40839909
40674035)
关键词
大地电磁
球体层状介质
一维正演
视电阻率
阻抗相位
magnetotelluric
sphere layered model
one-dimensional forward
apparent resistivity
phase.
