润湿性对砾岩油藏剩余油饱和度分布的影响

砾岩油藏二次开采结束后,其采收率较低,地下仍存在大量的剩余油。润湿性是控制这些剩余油分布的一个重要因素,它强烈影响着砾岩油藏水驱动态、毛管压力和相对渗透率。应用数值模拟方法着重研究了油藏水平上不同润湿情况下砾岩油藏剖面上剩余油饱和度的分布,以及砾岩层序韵律和油层厚度对油相饱和度分布的影响,并引入无因次变量对其模拟结果进行了分析。

THE EFFECTS OF WETTABILITY ON THE DISTRIBUTION OF REMAINING OIL IN THE CONGLOMERATE RESERVOIRS

The recovery of conglomerate reservoirs is not high after secondary recovery and quantity of remaining oil has been remained in the reservoirs. Wettability is an important factor controlling the distribution of the oil, it strongly affects capillary pressure, relative permeability, waterflood behavior and efficiency. The distribution of the remaining oil saturation in sections in a reservoir scale for strong water-wet and strong oilwet conglomerate reservoirs has been studied in the paper by applying numerical simulation, and effects of sequence rhythm and depth on the distribution of remaining oil in conglomerate reser-voirs have also been studied. Furthermore, a dimensionless parameter is introduced to analyze the simulation results.