辽河盆地黄金带油田沙一段沉积微相及其物性特征

Microfaces and rock property characteristics of Sha 1 formation in Huangjindai oil field of Liaohe basin

认识处于开发中后期油藏的沉积微相及其特征,对于研究剩余油分布、挖掘剩余油潜力、提高采收率具有重要的现实意义.通过对岩石相类型、粒度分布、电性标志等特征的分析,得出辽河油田在扇三角洲前缘背景下发育水下分流河道、河口砂坝、前缘薄层砂、分流河道间及湖泥等5种微相;分析了沙一下、中、上3个亚段的沉积微相及砂体展布特征;指出水下分流河道、河口砂坝微相储集物性最好,是下一步开发调整和剩余油挖潜的重点目标.

A better understanding of the remaining oil distribution is of great significance in taping the potential and increasing recovery efficiency.The research on lithofacies,grain distribution and electricity criteria demonstrates that microfaces of subaqueous distributary channel,river mouth bar,front thin sand,interdistributary channel and lacustrine shale occur in fan delta front.Analysis of microfaces and sand distribution on sub-formation of Sha 1 shows reservoir attributes of subaqueous distributary channel,river mouth bar is the perfect for development adjustment and taping remaining oil potential and these sands are the next potential target.