微观剩余油动态演化仿真模型研究

Dynamic simulation and evolvement model for microscopic remaining oil

长期注水开发使得储集层微观孔喉网络中的剩余油形成分布极复杂,应用仿真理论、方法和技术可以模仿不同油藏在不同含水阶段注水开发的动态演化过程,揭示剩余油形成机理和分布规律,研究表明,微观剩余油仿真研究是表征和研究剩余油演化规律的有效手段。在微观剩余油仿真研究中,应充分考虑和揭示孔隙非均质性、岩石润湿性、开发流体及温度、压力变化,经过多次修改和完善,建立精细仿真模型,有效地利用仿真技术研究剩余油的形成与分布。仿真模型的构筑是微观剩余油仿真研究的关键,仿真模型应包含油气藏本质属性,并能反映油气藏主要因素间的逻辑和数学关系。该成果已有效应用于油田开发,取得了显著效果。

After long-term water-flooding development, the pattern of remaining oil distribution in micro pore-throat-net of reservoir is complex. The geological situation of reservoir in the course of water-flooding development was simulated by using emulation theory and methodology. The formation and distribution of remaining oil were investigated. The result shows that the simulation technology is the effective way to characterize and investigate the evolvement of microscopic remaining oil in reservoir. The change of pore heterogeneity, wettability, development liquid, temperature and pressure should be considered and investigated in the simulation of microscopic remaining oil. A fine simulation model for microscopic remaining oil could be built up after repetitious modification, and then the formation and distribution of remaining oil could be studied effectively by simulation technology. The emulation model includes the essential properties of reservoir and images the logical and mathematical relationship between main factors of reservoir. The simulation technology has been applied to oilfield development successfully.