两种长源距声波波形特征及其时差提取方法  

Characteristics of Two Kinds of Long-spaced Sonic Waveform and Methods for Determining Slowness from Waveform

作　　者：胡文祥[1] 王冠贵[1] 

机构地区：[1]江汉石油学院地球物理勘探系

出　　处：《江汉石油学院学报》1992年第2期34-41,共8页Journal of Jianghan Petroleum Institute

摘　　要：分析了德莱赛公司和斯仑贝谢公司两种长源距声波全波测井波形及其频谱特征,并在比较了两种波形差异的基础上,对纵波、横波和斯通利波的时差提取方法进行了编程和计算。一些井的实际资料处理结果表明,其中用于首波检测的方差比值法和Hilbert(希尔伯特)变换法,以及用于后续波时差提取的基于相似峰跟踪的相似计算法和直接相位法获得了较好效果,K-L变换可用于改善波形信噪比、压制迭加波,这对时差提取具有重要意义。Based on the analysis and comparison of two kinds of full sonic waveform and their spectrum from Schlumberger's and Dresser-Atlas' acoustilog tools, thecharacteristics and difference of two kinds of waveform are discussed. According to the information, several kinds of methods for determining slowness from waveform are proposed, and computer programs are made for these methods. The processed results with some field examples show that the square deviation ratio method, Hilbert transform method for picking first break, the method of following the tracks of semblance peak and the method of direct phase determination for the slowness of S wave and Stoneley wave have achieved good results. K-L transform is useful for determining the slowness from full sonic waveform by improving the signal to noise retio of sonic waveform and for suppressing incoherent staked waves.

关 键 词：声波测井 波形 时差 K-L变换 

分 类 号：P631.814[天文地球—地质矿产勘探]