用双侧向测井响应求取地层参数的Newton－SVD反演方法

A NEWTON-SVD INVERSION METHOD OF USING THE RESPONSES OF DLL TO SOLVE FORMATION PARAMETERS

针对测井中经常遇到的完全非均匀的地层模型，利用深、浅双侧向测井的视电阻率曲线作为约束条件，给出了反演侵入半径ｒｉ、原状地层电阻率Ｒｔ、上（下）围岩电阻率Ｒｓｕ（Ｒｓｄ）的Ｎｅｗｔｏｎ－ＳＶＤ反演方法．数值模拟表明这一方法是可行的，经实际资料处理．说明该方法实用．

In this paper,for an axially symmetric 2-D model consisting of radially and vertically Inhomogeneous layers widely used for well logging formation evalution,using the deep and shallow apparent resistivity curves as constraint conditions,we have given a Newton-SVD inversion method for invaded radius of invasion,uninvaded zone resistivity Rt,upper and lower resistivity Rsu, Rsd. Numerical simulation shows the method is correct,dealing with the real well logs data shows the method is practical useful.