水平井地层界面声波测井响应模拟分析  

Simulated Response of Acoustic Log in Horizontal Borehole Placing on Interface of Two Formations

作　　者：丛健生[1] 乔文孝[1] 

机构地区：[1]中国石油大学资源与信息学院

出　　处：《测井技术》2008年第1期29-32,共4页Well Logging Technology

基　　金：国家自然科学基金资助项目(10674148)

摘　　要：基于对波动方程的高阶三维交错网格有限差分数值计算,在水平井孔轴线位于声速不同的两均匀地层的界面上的几何条件下,模拟了井中声场,给出了不同源距的接收波形和不同时刻的声场快照。分析结果表明,无论是哪种地层覆盖在上方,井中声场都是对声速较快的地层比较敏感,井孔中接收波形的首波时差都十分接近于声速较快地层的纵波时差。上述结果为水平井声波测井数据处理和解释提供了某种依据。Based on numerical calculation of wave equation with high-order 3D staggered-grid finite difference method, simulated is the acoustic wavefield in borehole whose axis is placed on interface of two isotropic formations with different sonic velocities, and presented are acoustic wave forms received at different transmitter-receiver spacings and snapshots of acoustic wavefield at different times. Analyzed result shows that wherever which formation covering on the top of the other, the wavefield is more sensitive to the formation with faster sonic velocity, every slowness of first wave arrival received in borehole is very close to the slowness of the formation with faster compressional wave velocity. The result provides a basic reference for data process and interpretation of acoustic logging in horizontal well.

关 键 词：声速测井 水平井 地层界面 有限差分法 声波时差 快照 

分 类 号：P631.31[天文地球—地质矿产勘探]