井壁附近偏心声源在井壁上激发的声场数值研究  

Numerical Study on Acoustic Field on Borehole Generated by Eccentric Sonic Source Near the Borehole.

作　　者：沈建国[1] 陈宇[1] 张海澜[2] 

机构地区：[1]清华大学物理系 [2]中国科学院声学研究所

出　　处：《测井技术》2002年第3期184-186,共3页Well Logging Technology

基　　金：中国博士后基金项目"中博金 (2 0 0 1 ) 5号"

摘　　要：根据井内偏心声源激发的二维声场及井壁不同位置的波形可以在井壁上激发环绕井壁传播纵波、横波及其它面波的理论 ,用实轴积分法计算了位于井壁附近的声源在井内液体和固体界面上激发的声场 ;结合液体与固体中的二维声场分布特征 ,探讨了测量地层水平或接近地层水平方向声速的可能性 ;由三维计算结果显示井壁上不同时刻的声场分布 ,直观显示各种波在不同水平面、不同方位角处的幅度分布 ,得到了纵波。D sonic field activated by eccentric source in boreholes and P wave, S wave and Stoneley wave in different positions on the boreholes, especially circumferential propagation features of Stoneley wave on borehole walls, acoustic field distributions on the boreholes generated by sonic source near the borehole walls, are determined by real axis integration. Based on 2D acoustic distributions on the boundary between fluid and solid, it is possible to measure the sound velocities in horizontal or near horizontal formations. 3D calculations indicate the sonic field distributions on the borehole in different time, which visualizes not only amplitudes of various waves at different levels and azimuths, but also provides approximate changes of P wave and S wave propagating time as near or far acoustic sources and azimuths change.

关 键 词：井壁附近偏心声源 井壁 激发 声场数值 声波测井 纵波 横波 声场分布 

分 类 号：P631.814[天文地球—地质矿产勘探]