疏松砂岩储层物性参数敏感性物理模拟实验

Physical modeling experiment on sensitivity of physical parameters of loose sandstone reservoir

利用物理模拟技术制作了一组微弱胶结、非固结高孔隙度人造样本。疏松砂岩储层物性参数的敏感性实验结果表明,与致密砂岩相比,疏松砂岩的弹性波速度对孔隙度的依赖性较弱,胶结物的性质对疏松砂岩岩石物理特性有重要影响。在纯砂岩中加入粘土或少量的粒间胶结物,会使弹性波速发生明显的变化;胶结温度影响岩样抗压强度。温度过低,会使胶结程度不够,固结强度较低;温度过高,岩样将变得松散。

The synthetic unconsolidated samples with weak cementation and high porosity were prepared using physical simulation technique. The sensitivity of physical parameters in loose sandstone reservoir was experimented with physical modeling. The experimental results showed that the velocity of elastic waves was independent to the saturation of loose sandstone compared with that of tight sandstone. The property of cement has a great effect on the physical characteristics of loose sandstone. When a little amount of inter-grain cements or clay is put into pure sandstone, the velocities of elastic wave will substantially changed. The cementing temperature has an influence on the compressive strength of the rock samples, Low temperature will make reaction strength deficiency, and high temperature will make the rock samples become relaxed.