采用层序地层学的划分与对比方法，将沾化凹陷孤岛东部斜坡下第三系划分出２个层序，又将第Ⅰ层序划分为３个准层序组和７个准层序。由于孤岛东斜坡地形较高，低水位体系域和湖侵体系域在该区不发育，因而仅发育高水位体系域。高水位体系域主要由滨浅湖沉积体系、扇三角洲沉积体系和浊积扇沉积体系组成。其中，扇三角洲和浊积扇砂体构成了本区的主要储层类型。 Using sequence stratigraphy division and contrast method, we divide the Tertiary in the east slope of the island of Zhanhua depression into two sequences, and divide the first sequence into three quasi-sequence sets and seven quasi-sequences. Due to the high terrain of the Gudao East Slope, the low-water system tract and the lake-trapping system tract are undeveloped in this area, so only the high water level system tract develops. The high-water system tract is mainly composed of shallow-shore lake sedimentary system, fan delta sedimentary system and turbidite fan sedimentary system. Among them, fan delta and turbidite fan sand bodies constitute the main reservoir type in this area.