东营凹陷西部沙四段上亚段滩坝砂体储集空间特征

通过岩心观察、薄片鉴定、扫描电镜分析和压汞资料分析等方法,对东营凹陷西部沙四段上亚段滩坝砂体储集空间特征、孔隙结构特征及控制因素进行了系统的研究.其储集空间分为孔隙和裂缝2种类型,其中,原生孔隙主要为压实残余孔隙和胶结残余孔隙,次生孔隙主要为粒间溶解孔隙,裂缝以构造裂缝为主.孔隙结构主要受成岩作用的影响,埋深小于2 700m、处于早成岩阶段的滩坝砂体储集空间主要为原生孔隙,孔隙结构主要为高孔高渗透粗喉型和中高孔中高渗透中喉型;埋深为2 700～3 500m、处于中成岩A期的滩坝砂体储集空间主要为次生溶解孔隙,孔隙结构以中高孔中高渗透中喉型和中低孔中低渗透中细喉型为主.

Reservoir space chracteristics of beach-bar sandbodies in the upper fourth member of Shahejie Formation,western Dongying Depression

Based on core observation,thin section arbitration,scanning electron microscope analysis,and mercury penetration data analysis, the reservoir space characteristics, and features and controlling factors of pore structure of beach-bar sandbodies in the upper fourth member of Shahejie Formation(Es4 ) in western Dongying Depression were researched. The reservoir space mainly includes primary pores, secondary pores and fractures. The remanent pores after compaction and cementation are the main primary pores. The...