深层原油裂解气是东营凹陷深层天然气藏的新类型,其气源、储层储集性、成藏过程等认识成为制约勘探的关键问题。本文利用深层源岩、储层和气样等实验分析,研究了生烃演化、储层演化和成藏演化过程。本文构建了储层成岩演化与储层孔隙演化的关系,定量刻画了影响储层孔隙度的成岩相,早成岩阶段的机械压实和胶结用使孔隙度减少了25.8%,中成岩阶段的溶蚀作用提高了孔隙度7.5%。裂解气成藏演化为早期的古油藏聚集和晚期古油藏的裂解,古油藏形成为生烃高峰期和储层高孔隙发育期的叠加效应,后期裂解气藏为高地温条件下古油藏原油裂解和储层孔隙萎缩的叠合结果,进而有利于原油裂解气藏的形成。 Deep crude oil pyrolysis gas is a new type of deep natural gas reservoirs in Dongying depression, and its understanding of gas source, reservoir reservoir formation and hydrocarbon accumulation process has become the key problem restricting exploration. In this paper, using deep source rocks, reservoirs and gas samples and other experimental analysis of the evolution of hydrocarbon generation, reservoir evolution and evolution process of accumulation. This paper constructs the relationship between reservoir diagenesis evolution and reservoir pore evolution, quantitatively characterizes the diagenetic facies that affect the porosity of the reservoir, mechanical compaction and cementation in the early diagenesis stage reduce the porosity by 25.8%, and the dissolution of the diagenetic stage The effect increases the porosity by 7.5%. The pyrolysis gas accumulation evolves into the early accumulation of paleo-oil reservoirs and the pyrolysis of late paleo-oil reservoirs. The formation of paleo-oil reservoirs is the superimposition effect of peak hydrocarbon generation and high-porosity reservoir porosity. The later pyrolysis gas reservoirs are paleo- The result of the combination of crude oil cracking and reservoir pore shrinkage is favorable for the formation of crude oil pyrolysis gas reservoirs.