Abstract In the present study, the oil miscibility and displacement of CO2/oil systems in nanoslits referred to three minerals (e.g., quartz, calcite and kaolinite) were characterized by molecular dynamics simulations. First, the mode of oil migration was identified to be affected by the difference in the interaction between CO2/C10 and solid surface. In the meantime, we recognized that the stability of displacement front was critical to ensure the smooth migration of oil phase. Besides, the oil molecules were more likely to undergo two-way mass transfer between oil and gas in the multi-component system. Nevertheless, the oil phase exhibited obviously poor mobility and higher viscosity in dynamic system, thereby inhibiting the oil phase that contained multi-components from being displaced and detached. Overall, the study highlights the effect of mineral types and oil components on the oil miscibility and displacement in CO2 flooding, which probably boosting the development of low permeability reservoirs.

中文翻译：

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纳米狭缝中二氧化碳提高采收率的静态和动态行为：矿物类型和油成分的影响

摘要 在本研究中，通过分子动力学模拟表征了三种矿物（如石英、方解石和高岭石）在纳米狭缝中的油混溶性和CO2/油系统的置换。首先，确定石油运移模式受 CO2/C10 与固体表面之间相互作用差异的影响。同时，我们认识到置换前缘的稳定性对于保证油相的顺利运移至关重要。此外，在多组分体系中，油分子更容易在油气之间进行双向传质。然而，油相在动态系统中表现出明显的流动性差和较高的粘度，从而抑制了含有多组分的油相的位移和分离。全面的，