Abstract: Changes of the longitudinal and transversal wave velocities in different directions and the rock velocity anisotropy as a function of confining pressure have been studied under laboratory ultrasonic frequency for shale and sandstone with marked foliation, which had been saturated by the fluids with different viscosity ( kerosene and vacuum pump oil) and salinity (distilled water, 50000μg/L and 150000μg/L NaCl liquid) respectively. The results show that (1) the longitudinal and transversal wave velocities in different directions increase with the increase of viscosity, while the parameters of rock velocity anisotropy ε, γ are contrary to this; (2) the longitudinal and transversal wave velocities in different directions increase with the increase of salinity, while changes of the parameters of rock velocity anisotropy ε, γ can be ignored within the error of the experiment.

Key words: viscosity, salinity, shale, sandstone, velocities, anisotropy

摘要： 利用不同黏度（煤油和真空泵油）、不同矿化度（蒸馏水、50mg/L 和 150mg/L的 NaCl 溶液）的流体对页岩和具有明显层理的砂岩进行饱和，在实验室超声频率下研究样品不同方向纵、横波速度以及各向异性参数ε、γ随压力的变化规律。结果表明：（1）随着黏度的增加，岩石纵、横波速度增大，各向异性参数ε、γ减小；（2）随着矿化度的增加，岩石纵、横波速度增大，各向异性参数ε、γ的变化在实验误差范围内可以忽略不计。

关键词: 黏度, 矿化度, 页岩, 砂岩, 速度, 各向异性