基于CT扫描图像的储层岩石渗流规律分析

Pore-Scale Study About Permeability of Porous Media Based on CT Image Technology

基于真实岩心的CT扫描图片,利用格子玻尔兹曼方法模拟了单相水流动以及油水两相驱替,首先,通过单相模拟,得到多孔介质的水相渗透率,然后利用SC模型,模拟油水驱替,得到相对渗透率曲线.结果表明：随着含水饱和度的逐渐增加,水相相对渗透率增加,而油相相对渗透率下降.随着驱替压力与界面张力比值的增加,水相相对渗透率krw没有显著变化,而油相相对渗透率kro明显增大.

This study conducted simulations of single-phase water influx and two-phase oil and water influx by using the lattice Boltzmann method on the basis of CT scanning pictures of cores. Firstly, the water phase permeability of porous medium was obtained by single-phase simulation. And then, the relative permeability curve is obtained by using SC model and simulating oil and water influx. Results indicated that the relative permeability of water phase increases but the relative permeability of oil phase decreases along with increasing of water saturation. When increasing the ratio of injecting pressure to interfacial tension, the relative permeability of water phase （Krw） does not change significantly, but the relative permeability of oil phase （kro） increases distinctly.