SKC-B大数控声波全波测井仪的数值研究  

Numerical study for SKC-B big,numeral control and full-wave logger

作　　者：沈建国[1] 陈宇[1] 张海澜[2] 袁福文[3] 张济祥[3] 

机构地区：[1]清华大学物理系 [2]中国科学院声学研究所 [3]大港油田集团测井公司

出　　处：《石油地球物理勘探》2002年第2期149-153,共5页Oil Geophysical Prospecting

摘　　要：SKC-B大数控声波全波测井仪是国内20世纪90年代研制的产品,本文对其进行了数值模拟,并计算了井中不同地层的全波波形,用波形的二维谱对全波波形中的纵波、横波及伪瑞利波和Stoneley波的特征进行了分析讨论。纵波的固有频率因仪器的存在而增大,纵波幅度还受地层的纵、横波速度比的影响。当地层的声速变低,横波速度与井内流体的声速接近时,伪瑞利波的频散特性减弱,速度逐渐接近于地层的横波速度;全波波形中,横波的幅度比较大,而Stoneley波的幅度、速度均比较小,与横波是分离的。SKC-B big,numeral control and full-wave logger was developed in the 1990s at home. The paper conducted numerical simulation for it,computed full waveform in different formation in hole and analyzed and discussed the characters of P-wave ,S-wave,pseudo-Rayleigh wave and Stoneley wave on their full waveform by corresponding 2-D spectrum. The intrinsic frequency of P-wave increases because of existence of apparatus and its amplitude has been influenced by velocity ratio of P-wave vs S-wave. Dispersion of pseudo-Rayleigh wave decreases and its velocity gradually approaches S-wave velocity of formation when formation velocity becomes lower and S-wave velocity approaches the sonic velocity of fluid in a hole. The amplitude of S-wave is larger,but the amplitude of Stoneley is smaller,and velocity also,which separate from S-wave.

关 键 词：SKC-B大数控声波全波测井仪 数值研究 声波测井 数值模型 二维谱 全波波形 模波 Stoneley波 

分 类 号：P631.83[天文地球—地质矿产勘探]