摘要
本文阐明了声波测井中的首波是波动方程的非线性效应,在井内外介质均为理想弹性体的情况下,导出了首波的解析表示式,指出它是一种共振模式,无轴向几何衰减。首波不是“临界、折射波至”,临界折射波不存在。几何声学不适用于声波测井。
It is proved that the head waves are of nonlinear effects of the elastic wave equations. The analytic expressions of the equations are obtained under the condition that the media inside and outside a borehole are perfect elastic. It is illustrated that head waves are of a resonant mode and have no axial geometrical attenuation and that geomitical acoustics is not applicable to well logging and that the concept of 'critical refracted arrival' is fictitious.
出处
《测井技术》
CAS
CSCD
1992年第1期1-5,共5页
Well Logging Technology
关键词
声波测井
波传播
波动方程
Acoustic Well Logging
Acoustic Propagation
Wave Equation
