核磁共振成像技术分析油运移过程中含油饱和度

Oil saturation analysis in migration pathways with NMR imaging technique

利用核磁共振成像技术,观察玻璃珠填装管状模型与河砂填装管状模型内油的运移过程,测量并分析油运移路径形态特征和内部含油饱和度.原始油柱内油饱和度可达83%;路径形成油沿路径运移时,油在路径内的饱和度为40%～50%;运移完成后,在没有油继续供给的条件下,原有路径收缩,宽度减小,路径内的油呈不连续状态,残余油饱和度降为20%～35%.实验装置中孔隙介质的颗粒成分对路径内的油饱和度有一定影响.

NMR imaging technique was applied to observe the oil migration pathways within a glass cylinder filled with water- wetting glass beads or sand grains. The oil saturations in the migration pathways at different stages are measured. It is found that the oil saturation may reach 830/00 within the initial accumulation column. The saturation is about 40%0-50%0 within the pathway when the latter is growing. The saturation is about 20%-35% within the pathway when migration finishes. The grains surface properties seem to influence the saturation within the pathway.