小气顶低幅构造强底水油藏剩余油分布主控因素  

Main control factors of remaining oil in the oil reservoirs with small gas cap,low amplitude structure and strong bottom water

作　　者：党胜国 权勃 闫建丽 齐鸿 

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《油气地质与采收率》2016年第1期129-133,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"海上油田丛式井网整体加密及综合调整技术"(2011ZX05024-002)

摘　　要：曹妃甸油田群河流相底水油藏是渤海海域已开发的一类重要油藏类型,采用不规则水平井井网开发,目前大多数油藏已进入中、高含水阶段,但采收率偏低,亟需理清剩余油分布规律和主控因素,指导油田下步综合调整。曹妃甸油田群新近系馆Ⅲ油组下段储量大、开发井多,是一个已进入高含水开发期的小气顶低幅构造强底水油藏。通过静态地质资料和动态生产资料相结合,认为微构造形态和小断距断层等构造因素、河漫滩成因夹层、油水界面差异、油田早期开发理念、目前开发井网等5大因素控制了研究区剩余油分布。在以第2期夹层为界的上、下开发层系中,剩余油分布具有一定规律性。上开发层系剩余油主要分布在油环井网不完善区域,下开发层系剩余油主要分布在油藏西部的油水界面较低及井网不完善区域、中部的水平生产井和气油界面之间、第4期主力夹层下部构造高部位以及距开发井较远的断层附近。The bottom water reservoir of fluvial facies in Caofeidian oilfields is a kind of important reservoir type in the Bohai sea,developed by irregular horizontal well pattern. Most of the oil reservoirs have entered into middle-high water cut stage with low recovery efficiency. It is urgent to research distribution law and main control factors of the remaining oil for guiding next overall adjustment. The lower member of GuanⅢ(NgⅢ)oil formation in Caofeidian oilfields is a main development unit with massive OIP,many production wells,small gas cap and low amplitude structure at high water cut stage.By analysis of geological data and production data,five factors controlling the distribution of remaining oil in the study area were concluded as structure factor(micromorphology of structure,faults with small fault throw and so on),interlayer of fluvial flood-plain,difference of oil-water contact,early development policy and current production well pattern. Remaining oil distribution has some regularity in the upper and the lower development units separated by the second-period interlayer.Remaining oil in the upper unit mainly distributes in the area with imperfect well pattern of oil ring. Remaining oil in the lower unit distributes mainly in areas with lower oil-water contact and imperfect well pattern of western oil reservoir,in the central region between lateral section and gas-oil contact,in the structural high part under the fourth-period interlayer and in areas near faults far away from production well.

关 键 词：小气顶低幅构造 水平井井网 夹层分布 底水油藏 剩余油 主控因素 分布规律 

分 类 号：TE341[石油与天然气工程—油气田开发工程]