中文摘要：

为深入分析岩样孔隙结构、润湿性与水驱流动特征及驱油效率的关系,基于砂岩微观水驱油实验,观察不同类型的水驱油流动特征,同时对实验岩样进行微CT扫描,获取其孔隙结构参数,建立与岩样孔隙性质等价的孔隙网络模型,结合铸体薄片与环境扫描电镜鉴定结果及毛管压力曲线特征定量分析实验砂岩的孔隙结构差异,并运用建立的砂岩孔隙网络模型模拟不同润湿性下水驱油过程。结果表明：孔隙结构是影响砂岩水驱油流动特征的主要因素;孔隙均质性越好,砂岩越易表现出网状—均匀驱替特征,反之砂岩则越易表现为树枝状驱替特征,指状型驱替砂岩居于两者之间;中性润湿模型的驱油效率高于水湿模型,水湿模型的驱油效率高于油湿模型。该研究可为制订合理的生产、增产措施提供技术指导。

英文摘要：

To deepen understanding pore structure, wettability and flowing properties during waterflooding and oil- displacement efficiency in rock samples microscopic tests for waterflooding in sandstone formations have been con- ducted to observe features of oil flow in waterflooding of various types. In addition, CT scans have been pedbrmed for rock samples to deteimine parameters related to their pore structures, and to construct pore network model with identical pore structures in rock samples. With consideration to casting thin-section and scanning electron micro- scope （SEMI results, together with capillary pressure curves in quantitative analysis to determine differences in pore structures of sandstone formations, waterflooding processes under different wettability conditions can be simula- ted for pore network models in sandstone. Research results show pore structure is the most influential factor for flow features in waterflooding of sandstone; Generally speaking, higher pore homogeneity may lead to network-evenly distributed displacement attributes in sandstone. Otherwise, sandstone may present displacement features with branch configurations. Between, sandstone with displacement of finger configuration can be found; Oil-displace- ment effieiencies of model with moderate wettability are higher than those of water-wet models, whereas oil-dis- placement effieieneies of water-wet models are higher than those of oil-wet models. Relevant research results may provide valuable technical guidance for preparation of proper production and productivity enhancement programs.