The oil transfer in shale oil formations includes the oil flow in inorganic and organic pores, and the diffusion in the organic matter (OM). A novel triple-continuum model (OM matrix, organic pores, inorganic matrix) is proposed coupling the oil flow (in organic and inorganic pores) and diffusion (in OM matrix). The proposed model is further validated by three-dimensional (3D) numerical simulations. The simulation results show that the proportion of oil production of the absorbed oil from OM matrix in the total shale oil production is small due to the relatively slow diffusion process. However, the diffusion of oil from OM matrix to the organic pores can provide extra energy for the oil expansion in inorganic pores, and thus can greatly increase the oil production in the depletion process. The high OM content can prolong the timespan of oil production. More absorbed oil in OM provides more elastic energy for oil depletion in organic and inorganic pores, and thus leads to higher flow rate in the late period of shale oil production. Smaller size of OM means shorter distance for oil transfer from OM to inorganic matrix, and thus accounts for higher movability of oil in OM.

中文翻译：

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通过 REV 规模模拟评估枯竭生产中有机质中页岩油的可动性

页岩油地层中的石油输送包括石油在无机和有机孔隙中的流动以及有机质（OM）中的扩散。提出了一种新颖的三连续体模型（OM 基质、有机孔隙、无机基质），耦合石油流动（在有机和无机孔隙中）和扩散（在 OM 基质中）。所提出的模型通过三维（3D）数值模拟得到进一步验证。模拟结果表明，由于扩散过程相对缓慢，OM基质吸收的石油产量占页岩油总产量的比例较小。而石油从OM基质向有机质孔隙的扩散可以为无机孔隙中的石油膨胀提供额外的能量，从而可以大大提高采油过程中的石油产量。高OM含量可以延长采油时间。有机质中更多的吸附油为有机和无机孔隙中的石油消耗提供了更多的弹性能量，从而导致页岩油生产后期的流量更高。 OM 尺寸越小，意味着油从 OM 转移到无机基质的距离越短，因此油在 OM 中的流动性越高。