Abstract: The pebbly sandstone sub?member in Tazhong?16oilfield as marine coastal deposits is divided into five layers and has to make a fine description of internal single sandbody in the layers for the need of efficient reservoir development. By means of rock electric calibration and identification on the well logs, the single shoreface dam is classified as inner edge, main part and outer edge, and the single sandbody can be divided into such three types as offshore waterway split, lateral contact and vertical superimposition. The distributions of the internal single sandbody are described in detail on the section in directions of parallel, oblique and perpendicular to the coastline and on the plane in five layers. The case study shows that the single layer level is suitable for blocking high water?cut intervals according to interlayer heterogeneity in view of vertical well, which can effectively realize the water?cut control and stable production; while single sandbody level favorable for blocking high water?cut intervals according to seepage difference between single sand bodies in view of horizontal, which can effectively alleviate the quickly waterflooded problem