鄂尔多斯盆地三叠系延长组属低孔特低渗砂岩储集层,其长7油层组烃源岩生成的油气如何运移到致密储集层及其动力来源和运移通道问题一直为人们所关注。根据泥岩压实研究和古水动力数值模拟结果,恢复了长1-长6油层组泥岩最大埋深时期的过剩压力,分析了长2油层组和长6油层组的油势分布和演化历史,进而,结合前人的研究成果,认为过剩压力是油气初次运移的动力,并从油气运移的角度提出了延长矿区就近聚集型、顺层运移型和穿层运移型3种成藏模式。

The Yanchang formation(Triassic) in the Ordos basin is the reservoir sandstone of the low porosity and low permeability.How has the hydrocarbon produced by the source of the Member 7 migrated to compact reservoir? What are the dynamic power and pathways for migration? These questions constitute long-term focuses.The article has adopted the methods of compaction research and palaeohydrodynamic modeling.Overpressure of Member 1 to 6 of Yanchang Formation has been resumed.Distributions and evolution of petrole.