CAJ | 학술논문

油层孔隙中剩余油的微观赋存状态是指导剩余油挖潜的重要依据。借助CT微观驱替实验系统，获得了水驱不同驱替时刻岩心模型的CT扫描图像，利用图像处理技术实现了岩心模型图像信息向三维数据体的转化。在此基础上提取剩余油的信息，提出了剩余油块数、平均体积、接触面积比、形状因子等指标对孔隙尺度下剩余油的微观赋存量、赋存位置及赋存形态进行定量表征。实验结果表明：随着驱替的进行，岩心模型中剩余油块数增多、平均体积减小，尺寸小于20倍平均孔隙体积的剩余油在数量上占绝对优势，该类剩余油所占的体积比例逐渐增大；剩余油逐渐从岩石表面剥落下来，水驱至残余油时刻水湿岩心中仍有约1/3的剩余油与岩石表面接触；剩余油形态由网络状向其他类型转化，驱替至残余油时刻以网络状和多孔状为主，结构相对复杂的网络状及多孔状剩余油是注水开发后期的主要挖潜对象。
유층공극중잉여유적미관부존상태시지도잉여유알잠적중요의거。차조CT미관구체실험계통，획득료수구불동구체시각암심모형적CT소묘도상，이용도상처리기술실현료암심모형도상신식향삼유수거체적전화。재차기출상제취잉여유적신식，제출료잉여유괴수、평균체적、접촉면적비、형상인자등지표대공극척도하잉여유적미관부존량、부존위치급부존형태진행정량표정。실험결과표명：수착구체적진행，암심모형중잉여유괴수증다、평균체적감소，척촌소우20배평균공극체적적잉여유재수량상점절대우세，해류잉여유소점적체적비례축점증대；잉여유축점종암석표면박락하래，수구지잔여유시각수습암심중잉유약1/3적잉여유여암석표면접촉；잉여유형태유망락상향기타류형전화，구체지잔여유시각이망락상화다공상위주，결구상대복잡적망락상급다공상잉여유시주수개발후기적주요알잠대상。
The microdistribution of residual oil in reservoir pore is an important basis for remaining oil potential tapping.With the aidof computerized tomography(CT)scanning and displacement experimental system,CT images at different displacement momentswere acquired,these images were then transformed to three-dimensional data volume by image processing technology.On this basis,information of residual oil was extracted and such characteristic parameters as number,average volume,contact area ratio and shapefactor were defined to characterize the microdistribution of residual oil at pore scale.Experimental results showed that:the numberof residual oil increased and average volume decreased with the increase of injected water volume;oil blobs smaller than 20 times av-erage pore volume constitute the overwhelming majority of residual oil in quantity and their total volume ratio increased;residual oilwere washed out from the rock surface gradually and nearly one third oil blobs had contact with the rock surface in water wet core;shapes of oil blobs changed from meshwork to other forms.Meshwork and multiple pore forms were in the majority at the end of thedisplacement so that they were the principal object of potential tapping during later stage of water-injection recovery.