层状大地视真频参数测深曲线的反演

在Cole-Cole模型假设的基础上,用一种新的递推反演算法对无电磁偶合影响时的水平层状大地对称四极装王复电阻率测深曲线进行反演,得出了层状大地上视电阻率、视时间常数、视频率相关系数、视充电率的视真频参数测深曲线.与需要复电阻率频谱的反演方法不同,该递推算法只需要4个不同频率的复电阻率数据,大大减少了野外工作量.通过对几种层状介质模型反演计算,结果表明:视真频参数测深曲线能够反映出各地层介质的真频参数随深度的变化规律;综合利用视真频参数能确定层状介质的频谱特性,从而达到区分岩石性质的目的.

Inverse calculation on apparent intrinsic induced polarization parametric curves over multi-layered earth

Based on the hypothesis of Cole-Cole model, a new recursive inversion method is used in the inversion of complex-resistivity sounding curves over multi-layered earth with Schlumberger array without electromagnetic couping. Four apparent intrinsic inducecd polarization(IP) parametric sounding curves over multi-layered earth are derived from complex-resistivity curves. Four apparent intrinsic IP parameters are apparent resistivity, apparent time constant, apparent frequency correlation coefficient and apparent charging rate. Compared with former inversion methods which need complex-resistivity spectrum, only four various frequencies of complex-resitivity data are required in this recursive method, so the work efficiency of complex-resitivity method is increased in field. Through the study on the inverse results of several multi-layered media model, the results show that the changeable rules of intrinsic IP parameters of each layered media with respect to depth are reflected in these apparent intrinsic IP parametric curves. Spectral characteristics of multi-layered earth is accurately deduced through an integrated consideration of apparent intrinsic IP parameters, thereby the spectral characteristics can be used to distinguish rock property.