摘要
本文旨在研究多孔岩石声衰减机制及衰减和频率的关系,用共振法测量了人工多孔材料10~5Hz以下的弯曲振动能量损耗,发展了前人测量弹性模量的方法.实验结果表明:干燥试样的内耗基本上与频率无关:水饱和试样的内耗比干燥试样的大得多,并在24.0kHz有显著的弛豫峰;饱和试样的内耗主要产生于固体骨架与孔隙流体之间的相对运动.实验结果与Riot理论和局部流体流动机制一致,但未看到Dunn预言的“边界效应”.
The attenuation of a kind of artificial porous medium at flexural mode has been measured from 10 Hz to 70 kHz in order to study the attenuation mechanism and the dependence of attenuation on frequency. A method has been suggested to measure the four independent elastic moduli of porous mediums. In our experiments, we have observed an obvious absorption peak of the saturated sample at 24.0 kHz. The attenuation value at the relaxation frequency is 7.3 times as high as that at the limit of low frequency.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第3期349-355,共7页
Chinese Journal of Geophysics
关键词
多孔材料
声衰减
岩石物性
物探
Porous medium, Acoustic attenuation, Physical properties of rocks.
