结合核磁共振与微米—纳米CT扫描技术,对鄂尔多斯盆地三叠系延长组长7段致密油微观赋存形式开展定量研究。利用核磁共振技术确定致密油在储集层中赋存量,测得原始含油饱和度为63.99%;利用CT扫描技术获取致密油储集层二维切片图像,经数字合成处理得到三维立体图像,据此将储集层中致密油分为薄膜状、簇状、喉道状、乳状、颗粒状和孤立状6种赋存形式。定量计算各种赋存形式致密油的含量发现,乳状和薄膜状致密油为主要的赋存形式,二者约占储集层中致密油总量的70%,其次为簇状和颗粒状致密油,孤立状和喉道状致密油含量低,各种赋存形式致密油含量与储集层原始含水饱和度、黏土矿物含量、孔隙结构等有关。 Combined with nuclear magnetic resonance (NMR) and micro-nano-CT scanning technology, the microscopic occurrence patterns of tight oil in Chang 7 Member of Triassic Yanchang Formation in Ordos Basin were quantitatively studied. Using NMR to determine the amount of tight oil in the reservoir, the original oil saturation was measured as 63.99%. Two-dimensional slice image of tight oil reservoir was obtained by CT scanning technology and three-dimensional image was obtained by digital synthesis. According to this, the tight oil in the reservoir can be divided into six types of forms: thin film, cluster, throat, milky, granular and isolated. Quantitatively calculating the content of tight oil in various existent forms, it is found that milky and thin-film tight oil are the main occurrences, accounting for about 70% of the total amount of tight oil in the reservoir, followed by tufted and granular densification Oil, isolated and throat tight oil content is low, the various forms of tight oil content and reservoir original water saturation, clay mineral content, pore structure and so on.