声速测井与VSP速度对比研究

声速测井与VSP速度分析都能够反应岩层声波速度,但其各有优劣.以研究VSP速度分析与声速测井误差的影响因素为基础,通过实例分析,讨论井中泥浆和井壁垮塌等因素对于声速测井的测量结果的干扰.由对比分析结果认为：首先VSP平均速度测量相比声速测井来说更为可靠;其次在受泥浆滤液及井壁垮塌影响较为严重的层段,声速测井受干扰影响误差较大.因此,VSP的层速度分析结果同样更为准确;而声速测井的优势在于分辨率高于VSP.

A Comparative Study of Acoustic Log and VSP

There are two velocity analysis methods： acoustic log and VSP,each having its merits and demerits.This paper discusses the factors resulting in the errors of the two methods.Based on the studies of some samples,we give an analysis of the interference of mud fluid and the collapse of the well which results in the errors of acoustic log.A comparative study leads to the conclusion that,first,the average velocity of VSP is more reliable than acoustic log;second,the error discrepancy of acoustic log proves to be greater at the sections where mud fluid and collapse are more severe,therefore,the average velocity of VSP is also more accurate than acoustic log.The advantage of acoustic log lies in higher resolution.