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前积油层的相域划分和小层对比极大地影响着油藏的注水效果和采收率，尤其象那些低角度薄前积油层由于规模小在地震剖面上无明显的前积反射，因而几乎还没有有效的方法来搞清每个前积叶砂体的空间展布。桩５２块近岸浊积扇油藏就是一例。应用基准面旋回高分辨率层序地层学原理，结合三维地震解释，对桩５２块油藏小层重新对比可发现它是由堆积在“三沟两梁一面坡”的深～半深湖地理背景上的２０个叠瓦状排列的前积叶砂层所形成，而不是以前对比所认为的由全区分布的４个平行的浊积砂层组成。
The phase division and the stratum contrast of the former reservoir greatly influence the water injection effect and oil recovery of the reservoir, especially since those low-angle thin fore-oil reservoirs have no obvious pre-integral reflection in the seismic profile due to their small scale, There is no effective way to figure out the spatial distribution of each pre-clump leaf body. Pile 52 nearshore turbidite fan reservoir is an example. Using the principle of high-resolution sequence stratigraphy of base-level cycles and combining with three-dimensional seismic interpretation, a new comparison of the sub-reservoirs in the 52 reservoirs shows that it is composed of deep and semi-deep lake geographies deposited on the “three ditch and one beam and one slope” Instead of the four parallel turbid sand layers distributed across the region as previously thought by the authors.