The analysis of the physical experiment and numerical simulation results shows various oil migration modes.There are three modes of oil migration under actual geological conditions:stable mode

fingering mode

and spring mode.Different migration modes have different patterns of migration

thus using single numerical simulation method to simulate all the modes is not very scientific.Therefore

different migration modes shall be described with different numerical simulation methods.Invasion percolation method is suitable for the description of the fingering mode and the spring mode

while the Darcy equation is applicable for the stable mode.The fluid potential method can be applied to all the three modes

but its results are qualitative.In order to determine the real oil migration process

the mathematical simulation shall be based on detailed geological data

oil and gas shows and geochemical data.