For clean sandstone, the acousticdispersion of compressional wave exists obviously when its porosity is more than 28%.
对纯砂岩，当孔隙度大于28%时存在明显纵波声频散。
2
Based on the results of dispersion experiments on cores of sand and shale, the paper analyzed the variability of acousticdispersion for dry and water-saturated cores.
结合岩心砂泥岩频散特性实验结果分析了岩心在饱水及干燥状态下声频散的特点。
3
The existence of various lacunas in bolt bonding system will cause the acoustic wave energy attenuation, phase aberration and frequency dispersion.