摘要
针对陆相曲流河油藏复杂的砂体分布特征及重建地下认识体系关键技术难点,在分析陆相盆地地层建造及曲流河储层形成基础上,通过建立并运用曲流河储集层层次细分方法,将吉林扶余油田白垩系杨大城子组曲流河油藏分为4个砂层组,21个小层。在小层划分基础上,以曲流河单砂体内部构型刻画为重点,通过综合运用岩心、密井网测井、开发动态等资料,对研究区点坝单砂体层次界面、岩相组合及空间展布与配置关系进行系统研究,并探讨了剩余油成因及分布特征。研究结果表明,形成于弱水动力环境的杨大城子组曲流河油藏点坝单砂体受两级沉积界面控制,形成的侧积体数多在3～4个,侧积面夹角多在4°～7°,平面规模差异较大。孤立型、搭接型、叠加型和切叠型是储集层单砂体空间配置的主要方式。受点坝侧积泥岩等夹层及注采方式影响,剩余油多分布于点坝、孤立及切叠砂体中,构成了油藏实施二次开发的物质基础。
It is acknowledged that distribution of sandbodies in reservoirs of meandering river facies is very complex, which makes it hard to rebuild the subsurface system. Based on the analyses of formations in terrestrial basins and the development of meandering river reservoirs, we divide the meandering river reservoirs of the Yangdachengzi Formation in the Fuyu oilfield into 4 different sand groups and 21 subzones by using the hierarchical subdivision method. Based on the subdivision of subzones, we focus on the configuration of internal architecture of single sand body in meandering river reservoirs. With data of cores, dense well log and production performance ,we systematically study the hierarchical interfaces, lithofacies combinations and spatial distribution and assemblage of single point bar sandbodies in the study area. The genesis and distribution of remaining oil are also discussed in this paper. The results show that, the single point bar sandbody of meandering river reservoirs in the Yangdachengzi Formation deposited in an environment with weak hydrodynamic force is controlled by two hierarchical sedimentary interfaces. The number of lateral accretion bodies is mainly 3 or 4 ; the included angle of lateral accretion face ranges from 4° to 7° ; the horizontal scale varies greatly. The main types of spatial combination of single sandbody are isolated type,lapping type, overlaying type and cutting-piling type. Influenced by lateral-accreted mudstones of point bars and injection-production strategies, the remaining oil is mainly distributed in point bars,isolated and cutting-pilling sandbodies,which lays the foundation for secondary recovery.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2010年第1期119-125,共7页
Oil & Gas Geology
关键词
层次细分
单砂体构型
空间配置
剩余油
曲流河油藏
扶余油田
hierarchical subdivision, architecture of single sandbody, spatial assemblage, remaining oil, meandering river reservoir, Fuyu oilfield
