一种快速准确求取复电阻率真频参数的反演方法

A RAPID AND PRECISE INVERSION METHOD FOR THE DETERMINATION OF INTRINSIC COMPLEX-RESISTIVITY PARAMETERS

复电阻率法评价极化体极化性质的依据是极化体与围岩的柯尔-柯尔模型参数的差异,因此根据目标极化体的视谱求其真柯尔-柯尔参数,是复电阻率法评价极化体性质时必须解决的基本任务。本文针对水平层状极化介质提出了一种复电阻率最优化反演和递推反演相结合的新的求取真频参数的反演方法,该方法只需测量四个不同频率的复电阻率数据就可进行反演。为了考查该方法的反演效果,与单测点视谱常规反演法及联合谱激电反演法进行了对比计算,并对同一模型选取不同的初始参数进行了反演。计算结果表明,这种方法计算快速、稳定收敛,对反演初值要求不高,结果准确。

The difference of cole-cole parameters between polarized body and host rock is used to estimate polartzed property of polarized body in complex-resistivity method. The basal work which must be settled in estimating polarized property of polarized body is to obtain intrinsic parameters from apparent spectrum in complex-resistivity method. A new inversion method for the determination of intrinsic IP parameters of multi--layered polarization earth is developed including complex--resistivity optimal inversion and recursive inversion. The inversion can be done only by measuring four various frequencies of complex--resitivity data. In order to check the validity of inversion result, we calculate cole--cole intrinsic parameters by this method in contrast with general inversion of the spectrum measured at one station and joint inversion of the spectra. We also inverse the same model with different initial parameter values. Inversion results show that quick calculation, steady convergence, little request for inversion starter and veracious results are the characteristics of this method.