含油饱和度对纵波速度影响规律的实验研究

Experimental Study of the Effect of Oil Saturation on the P-wave Velocity

油气储层的物性参数是勘探地球物理的重要基础资料,为了研究含油饱和度、孔隙度对纵波速度的影响,在实验室内对5块天然岩心及2块人造岩心样品进行了油驱水情况下弹性波速的测量,给出了纵波速度随含油百分比变化的拟合公式,并讨论了含油饱和度变化对岩石纵波速度的影响,实验结果表明,随着含油饱和度的增加及含水饱和度的减少,纵波速度有上升的趋势;孔隙度越小的岩石,纵波速度越高,纵波速度随含油饱和度变化的幅度就越大。

The physical parameters of oil and gas reservoir in rocks are important fundamental data for exploration geophysics. To study the influence of oil saturation and porosity on the Pwave velocity, under the performance of oil injection, petrophysical elastic measurements are carried out on five natural rocks and two artificial rocks in laboratory. The best fit of the relationship between the P - wave velocity and the oil saturation is given, and the influence of oil saturation and porosity on the P - wave velocity is discussed in the paper. The measurement results show that the P - wave velocity increases with oil saturation increasing and water saturation decreasing; the smaller the rock porosity is, the higher the P - wave Velocity is.