尺度放大时逾渗模型中的油气运移路径变化规律探讨

Changing patterns of hydrocarbon migration pathway in a up-scaling percolation model

数值模拟获得的油气二次运移路径不受模拟网格大小的影响,但模拟网格的大小却影响侵入相饱和度值的大小。其中,运移网格的宽度和侵入相饱和度呈指数关系,运移网格的长度和侵入相的饱和度无关,运移网格的尺度和侵入相饱和度呈指数关系。这一规则的发现为逾渗理论从微观放大到盆地尺度提供了理论依据。

Under the hypothesis that hydrocarbon migration conforms to the description of percolation theory, the relationship between the saturation of invading fluid （ the percentage of the migration pathway to the whole lattice） and the width, length, and dimension of the simulation lattice is studied by means of up-scaling and mathematical simulation. The result indicates that, instead of exerting influence upon the numerically simulated secondary migration pathways of hydrocarbon, the size of the simulation lattice has an impact on the saturation of invading phase, which is found to have an exponential relation with the width of the lattice but no connection with the length of the lattice. The discovery of the rule provides sound theoretical basis for the application of the percolation theory in the study of basins.