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在总结国内外断层封闭与油气运移和聚集研究成果的基础上，系统讨论了碎屑岩层序中断层的封闭机理、断层与油气运移的关系以及断层圈闭的油气差异聚集作用。通过黄骅坳陷北塘凹陷断层的封闭性及断层油气藏差异聚集分析，表明断层在活动停止期主要起封闭作用，但在正常压实层序段仍有少量轻组分的烃类沿断层发生运移而引起差异聚集；而在欠压实带，异常高孔隙流体压力使断层在纵向上具有很强的封闭性。
On the basis of summarizing the research results of fault sealing and hydrocarbon migration and accumulation both at home and abroad, this paper systematically discusses the sealing mechanism of faults in clastic sequence, the relationship between fault and hydrocarbon migration and the differential accumulation of oil and gas in fault trap. The fault sealing and the differential accumulation of fault reservoirs in Beitang Sag, Huanghua Depression show that the faults mainly play a blocking role during the stop of activities, but hydrocarbons with light components still exist along the fault during the normal compaction sequence Migration and cause differences in aggregation; and in the under-pressure zone, abnormally high pore fluid pressure so that the fault has a strong vertical seal.