摘要
本文讨论了裸眼井中由点状声源激发的首波与次首波问题,认为:首波与次首波分别是以地层纵波速度V_c和地层横波速度V_s传播的几何衰减波。同时给出了泄漏波的解析式,而泄漏纵波和泄漏横波的截止频率分别为远场处的首波与次首波的传播特征频率。
In this paper, the compressional and shear arrivals excited by a point source are analyzed. It is pointed out that the compressional and shear arrivals, propagating along a borehole with Vc and Vs respectively, are attenuated waves. In far-field, their characteristic frequencies are equal to the cut-off frequencies of leaky compressional and shear modes respectively. The elastic wave function of leaky modes has been obtained.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第6期733-739,共7页
Chinese Journal of Geophysics
关键词
声波
测井
首波
次首波
频率
Acoustic logs, Compressional arrivals, Shear arrivals, Characteristic frequencies, Leaky modes, Fluid waves.
