关键词: 盆地模拟, 油水系统, 烃源岩, 相对渗透率, 排油模型, 压实渗流模型, 库车坳陷

Abstract: The formulas for calculating relative permeability of oil-water two-phase in source rocks were presented.In combining with the principle of successive sedimentary compaction,a new oil expulsion model known as the compaction-filtration model was established.Compared to the old "pure compaction model",the compaction-filtration model has two major advantages.Firstly,it does not use the inaccurate assumption that the ratio of oil to water before liquid expulsion equals that in expelled liquid,and the ratio of oil to water in expelled liquid can be determined by the relative permeability and viscosity of oil and water.This model reasonably improved the geological model.Secondly,it overcomes the shortcoming of the pure compaction model whereby the oil expulsion started too early and the expelled amount of oil was too large in the early stages and too small in the late stage.This improvement greatly enhances the accuracy of oil expulsion simulation and ensures the reality of following oil migration-accumulation history simulation.The applied case comparison of the old and new models in Kuqa Depression proves the rationality and practicability of the compaction-filtration model.

Key words: basin modeling, oil-water two-phase system, source rock, relative permeability, oil expulsion model, compaction-filtration model, Kuqa Depression