摘要
本文主要对实验室岩心测试中由于高频引起的速度频散现象进行研究。研究中主要采用Gassmann方程计算了干岩样盐水饱和后的纵、横波速度,代替地震勘探频率下的纵、横波速度,并与盐水饱和样品的实测速度进行对比,由此估计速度频散的大小。通过对不同地区实例的研究发现:对物性较好的样品,频散现象较小,此时基于岩心测试数据所作的岩石物理研究可以用来指导地震勘探研究;而对物性较差的样品,频散现象较为明显,此时要审慎应用测试的数据。
This paper mainly discusses velocity dispersion due to high frequency in ultrasonic core measurement of laboratory.We adopt Gassmann's equation to calculate V_P and V_S of the brine-saturation core sample,then contrasted them to actual measured ultrasonic velocities of the samples.Therefore the magnitude of velocity dispersion is estimated.Through research of a few examples in 2 areas in South China Sea,we have found the following discoveries: When the properties of reservoir samples are good,the velocity dispersion is small,lab rock physics research results are suggested to be applied in seismic exploration.When the properties of reservoir samples are poor,the velocity dispersion is strong,we should be careful in applying lab core data in seismic exploration.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2011年第5期779-782,836+665,共4页
Oil Geophysical Prospecting
基金
国家重大专项(2008ZX05023-004)资助
关键词
速度频散现象
岩心声学测试
盐水饱和速度
对比速度
GASSMANN方程
velocity dispersion phenomena,core ultrasonic measurements,acoustic velocity of brine-saturated samples,contrastive velocity,Gassmann's equation
