含油气盆地岩性圈闭成藏动态分析——以鄂尔多斯盆地西峰地区长8油藏为例

摘要

This paper presents a newly developed dynamic analysis method for lithologic-trap reservoir evolution. Taking a typical lithologic reservoir as an example, the evolution of main elements contributing to the formation of typical lithological reservoir is studied in source rock pressure, reservoir porosity, oil-gas charging, lithologic-trap formation, building up the dynamic model of the formation of lithologic reservoir. The results show that the model of Chang-8 lithological reservoir in Xifeng area belongs to near-source and high pressure hydro- carbon accumulation model with features of dual elements controlling the reservoir by migration drive force and critical physical properties of reservoir.%针对岩性圈闭成藏过程提出了动态分析的综合研究方法。通过对典型岩性油藏动态解剖,重点研究岩性圈闭成藏过程中主要形成要素的演化特征,着重恢复地史时期烃源岩地层压力、储集层孔隙度、油气充注、岩性圈闭形成等关键因素在时空变化中的演化规律,同时对各成藏要素进行综合分析,确定岩性油藏形成的动态演化过程。研究结果表明,西峰地区长8岩性油藏为近源高压成藏模式,具有成藏动力和储集层临界物性＂二元控藏＂的特点。