测井纵横波速度的油气层侵入校正法

A New Invasion Correction Method for P and S Wave Velocity Logs from Oil and Gas Bearing Formation

根据Gassmann方法,提出了被侵入的纯石油气层纵横波速度校正方法。在假定岩石体积模量是其上、下限值线性加权平均值的条件下,提出了泥质岩石油气层声波速度校正法。纯砂岩的校正精度百分误差小于5%;泥质砂岩校正误差绝大多数小于10%。与纵波速度校正相比,横波速度校正对参数要求不严且精度较高。

Liu Guoqiang,Tang Tingdong.A New Invasion Correction Method for Compressional and Shear Wave Velocity Logs from Oil and Gas Bearing Formation.WLT,1993;17(4):273～278 Based on Gassmann Equation,a new invasion correction method for compressional and shear wave ve- locity logs from clean sand is presented.And a correction method for acoustic logs from shaly sand is also proposed assuming that the bulk modulus of the rock is the linear weighted averages of its upper and lower limits.Correction accuracy for clean sand and most of the shaly sand is less than 5% and 10% respectively. Compared with P wave velocity correction,parameter selection for S wave velocity correction is not so strict but with better accuracy.