高邮凹陷垛一段油气藏特征及成藏控制因素分析

Analysis of hydrocarbon reservoir characteristics and key controlling factors of E_2s_1 of Gaoyou Sag

高邮凹陷垛一段是区内主要含油气层系之一,具备充足的油源、良好的油气输导及合适的储盖组合条件,有利于油气成藏。油气藏主要分布在高邮凹陷深凹带,具有储量规模差异大、分布地区广泛、成藏层系相对集中及油气藏类型多样等特征。通过对构造背景、输导条件、储盖组合、砂地比及遮挡断层封闭性等方面的研究,分析了E_2s_1油气藏形成的控制因素,为E_2s_1油气藏勘探的挖潜和拓展提供了依据,在实践中取得了良好效果。

E2s1(1 st member of Sanduo Formation)is one of main hydrocarbon bearing series in Gaoyou Sag.It has conditions of adequate oil source,good hydrocarbon migration and favorable reservoir-cap rock assemblage,which are beneficial to hydrocarbon accumulation.The hydrocarbon reservoirs are mainly distributed in the deep sag area of Gaoyou Sag,which has characteristics of big difference of reservoir scale,wide distribution area,relatively concentrated reservoir series,and multiple types of hydrocarbon reservoir,etc.Based on the analysis of inherited tectonic background,oil migration,reservoir-cap rock assemblage,sandstone development degree and fault sealing,etc.,it was summarized the key controlling factors of E2s1 hydrocarbon reservoirs,which provides the exploration basis.