核磁共振成像技术在油气运移路径观察与分析中的应用

Application of NMR imaging technique to quantitative observation and analysis on hydrocarbon migration pathway

利用核磁共振成像技术观察圆管填玻璃珠物理模型内油的运移过程 ,对成像处理方法进行改进后 ,可以定量地观察和分析运移路径的形态特征及其内部的油饱和度。实验结果表明 ,被油占据的运移路径在整个通道内的比例取决于路径的形态 ,而路径内的油饱和度并非 10 0 %。在实验模型的尺度上 ,运移路径上的油饱和度在运移过程中可达 80 %以上 ;在运移结束后 ,因运移路径收缩、分离 ,油饱和度只占 2 0 %～ 40 %。

The NMR imaging technique was applied to observe the oil migration process within a cylinder physical model filling with water-wetting glass beads.The migration pathway of oil can be clearly observed,and the oil saturation within the pathway can be quantitavely analyzed with the image processing method.It is found that the proportion of pathway filling with oil in whole cylinder depends on the cluster pattern.The oil saturation within the pathway may reach 80 percent in most parts of the cluster during oil migration.After the migration,the proportion of oil saturation within the pathway is in the range from 20 percent to 40 percent,or even smaller due to contraction and separation of the pathway.