摘要
以鄂尔多斯盆地延长组2个典型的特低渗透砂岩储层为例,利用真实砂岩微观模型水驱油实验模拟注水开发过程,对水驱油过程中油水微观渗流通道类型和驱替特征进行了定性分析和定量表征。实验过程中共观察到粒间孔、溶蚀孔、粒间孔—溶蚀孔、微裂缝、微裂缝—孔隙和微孔6种主要的油水渗流通道,其差异性与沉积微相、孔隙和喉道的分选、连通情况及粘土矿物的胶结程度有关。实验模型的驱替类型主要为均匀驱替、蛇状驱替、树枝状驱替和网状驱替4种,水驱油过程中油水渗流阻力大,水驱油动用程度差,残余油类型以油膜、卡断及绕流残余油为主。油水微观渗流通道的随机选择性和复杂性是造成驱替特征和驱替效果差异的主要原因之一。
Water/oil micro-flow channel type and displacement characteristic are analyzed qualitatively and characterized quanti-tatively during the process of water driving through sandstone micro-model lab experiment for the examples of two typical ultra-low permeability sandstone reservoirs in Ordos basin.Through the experimental process,six kinds of micro-flow channels are ob-served,which are affected by depositional microfacies,pore throat sorting and communication,and clay mineral cementation in-fluence.Experimental models present four kinds of displacement type.Flow resistance of water/oil is high,and water driving per-formance is low,and the irreducible oil is mainly in form of film,dispersed and peripheral.Random selection and complexity of water/oil micro-flow channel are main reasons that have caused variation of displacement characteristics and performance.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2011年第1期58-62,115,共5页
Petroleum Geology and Recovery Efficiency
基金
"十一五"国家科技支撑计划"延长特低/超低渗透油藏注水开发方式优化研究"(2007BAB17B02)
陕西省教育厅2010年科学研究计划(2010JK778)
关键词
微观渗流通道
驱替特征
水驱油实验
特低渗透砂岩储层
鄂尔多斯盆地
micro-flow channel
micro-displacement characteristic
water driving experiment
ultra-low permeability sandstone reservoir
Ordos Basin
