特低渗透储层水驱前后储层特征变化规律及机理研究——以长庆油田白209井区长6油层组为例  

Law and Mechanism of Characteristic Changes of Ultra-low Permeability Reservoirs Before and After Waterflooding

作　　者：何文祥[1,2] 谭文才[1,2] 马超亚[3] 

机构地区：[1]长江大学地球化学系 [2]油气资源与勘探技术教育部重点实验室(长江大学),湖北荆州434023 [3]中石油长庆油田分公司第七采油厂,陕西吴旗717606

出　　处：《石油天然气学报》2010年第5期56-59,共4页Journal of Oil and Gas Technology

基　　金：国家"973"规划项目(G199902250)

摘　　要：长庆油田白209井区长6油层组储层为特低渗储层。为研究特低渗储层水驱开发后储层特征变化规律,选取该井区内相同层位、深度接近的岩心进行水驱前后储层特征变化规律对比研究。结果表明,水驱后粘土矿物总量减少;伊利石相对、绝对含量减少;伊/蒙混层相对、绝对含量增加;绿泥石相对含量稍有增加、绝对含量减少。水驱后岩石的孔隙结构更加复杂,孔喉分布不集中,孔隙结构非均质性增强,渗透率变差。另外,润湿性试验结果显示注水后储层空气渗透率减少,吸水量增加,吸油量减少,水润湿指数增加,油润湿指数减少,储层岩石润湿性向亲水方向变化。Chang 6reservoir of Block Bai 209in Changqing Oilfield was an ultra-low permeability reservoir.Cores from the same horizon and adjacent depth in the block were chosen to analyze the law of characteristic changes of the ultra-low permeability reservoir after waterflooding.The results indicate that the total contents of clay mineral decrease,the relative and absolute values of illite decrease and illite-montmorillonite mixed-layer mineral increases,the relative value of chlorite increases a little and the absolute value decreases.Pore and throat structure is more complex and is poor in distribution,heterogeneity of pore-throat structure increase and reservoir permeability decreases.Besides,the result of wettability analysis shows that air permeability decreases,water absorption increases and oil absorption decreases,the index of water wettability increases and oil wettability decreases,the wettability changes into water wetting.

关 键 词：特低渗透储层 压汞试验 伊/蒙混层 孔喉结构 润湿性 

分 类 号：P618.13[天文地球—矿床学]