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Fine characterization of remaining oil based on a single sand body in the high water cut period
Author(s): 
Pages: 1131-1136
Year: Issue:  6
Journal: Acta Petrolei Sinica

Keyword:  single sand bodyremaining oilunderwater distributary channelextra-high water cut periodthin and narrow sand body;
Abstract: 以葡北油田葡Ⅰ油组窄、薄砂体特高含水期注水开发油藏为例,提出了基于单砂体的剩余油分布规律、挖潜单元以及相对应的挖潜技术对策.所指单砂体是地质上具有成因联系、开发上相对独立的砂体单元,既是地质上的成因单元,也是与剩余油分布有关的渗流单元,既反映了砂体的沉积成因,也决定了剩余油分布特征和注水开发特征.单砂体成因类型可以划分为多期河道叠加型、分支河道型、单一河道型和席状砂型4个大类;结合注水开发特点,每种类型具有高注高采、高注低采、低注低采和低注高采4种注采方式.剩余油潜力评价的结果表明:多期河道叠加型单砂体潜力最大,剩余油主要为注水下窜型、顶部型、段塞式和欠注型4种类型,可以分别采用厚注薄采、油水井调剖堵水、井网调整和加密井网等措施进行剩余油挖潜;其次是席状砂型单砂体,剩余油表现为“蜂窝状”,建议利用注水井调剖和油层压裂来优化注水效果,进行剩余油挖潜.
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