摘要
研究对象是注水开发39 a、含水已高达96%以上处于特高含水阶段的胜坨油田二区沙二段12层。通过对不同含水阶段储层中地层微粒、渗透率、孔喉网络及润湿性变化规律的研究,定量得出了渗透率随含水率变化的数学表达式,并分析了储层参数变化对开发效果的影响。研究表明:长期注水冲刷使砂岩储层中的地层微粒被冲出,孔喉网络的连通性变好,渗透率升高,储层润湿性由亲油转变为强亲水。储层参数变化使油藏最终采收率增加,开发效果变好,有利于剩余油的的采出。
The target layer is Section 2 of ShaⅡMember in Block Ⅱof Shengtuo Oilfield at ultra-high water cut stage with high water cut over 96% and 39 years water flooding.Through the research on formation fines,permeability,pore throat net work and wettability change rule of oil layers at different water cut stages,mathematical expression of permeability changing with water cut degree is quantitatively derived,the effect of reservoir parameters change on the development effect is analyzed.Study shows that long-term injected water has washed out the formation fines from sandstone reservoir,connectivity of pore throat net work thus improves,permeability rises,and reservoir wettability is conversed into strong water wet from oil wet.Reservoir parameters change will cause ultimate recovery rising and development effect improving,both of which is favorable for production of remaining oil.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2006年第4期35-37,共3页
Petroleum Geology & Oilfield Development in Daqing
关键词
地层微粒
渗透率
孔喉网络
润湿性
开发效果
formation fines
permeability
pore throat net work
wettability
development effect
