岩石声频散的实验研究及声波速度的外推  

AN EXPERIMENTAL STUDY OF ACOUSTIC DISPERSION OF ROCK AND EXTRAPOLATION OF THE VELOCITY

作　　者：张元中[1] 楚泽涵[1] 李铭 罗曼 

机构地区：[1]石油大学地球科学系,北京102200

出　　处：《地球物理学报》2001年第1期103-111,共9页Chinese Journal of Geophysics

基　　金：中国海洋石油总公司"863"计划资助项目

摘　　要：对岩石声频散进行了实验研究 ,用不同频率的声学探头使用超声波脉冲穿透法对砂岩和泥岩样品进行了测量 ,并分析了两者的频散现象 .结果表明 :在 51kHz— 1MHz频率范围内 ,在干燥状态下岩芯有频散现象 ;在饱水状态下 ,砂岩的频散现象更明显 ,岩芯中流体的存在是影响纵波频散的一个重要原因 .利用频散方程计算不同频率时的速度值 ,并与实验结果进行了比较 。The acoustic dispersion of rocks is investigated with experimental method samples of sandstone and shale are measured at different frequencies with ultrasonic pulse penetration method, and then the acoustic dispersions are analyzed. The results show that the dispersion exists in both dry and water saturated sandstone. The water in the rock has important impact on the acoustic dispersion. The velocity of the different frequencies are calculated by the dispersion equation and compared with the measured values, the results show that the dispersions in sandstone and shale are good agreement with the dispersion equation. [

关 键 词：砂岩 泥岩 声频散 实验 声波速度 频率 岩芯 衰减系数 

分 类 号：P584[天文地球—岩石学]