点声源在充液裸眼井中轴上激发的伪瑞利波传播特性

Pseudo-Rayleigh Wave Propagation Property in a Fluid-filled Borehole Excited by a Point Sonic Source on the Borehole Axis

余恬．点声源在充液裸眼井中轴上激发的伪瑞利波传播特性．测井技术，１９９４，１８（２）：１０１～１０９详细分析了伪瑞利波的相速度、群速度及格林函数的频谱，根据各分波的到达时间与频率的关系，绘出了三种理想岩石位移势格林函数的时域波形，讨论了波形的主要组分及其特点，并定性地讨论了地层粘滞性对其产生的影响．

Phase velocity,group velocity and the spectrum of the Pseudo--Rayleigh wave are analysed in detail. The wave--forms are computed numerically for 3 lithologies carefully by taking into account of the fact that the arrival time is dependent on frequency. It is found that the whole normal mode wave--train is composed of 3 parts. Their main features are illustrated. The influence of the visco--elasticity of the formation rock on the wave form is also given qualitatively.