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由于断陷湖盆陡坡带古地形上不存在从平缓到陡峻的突然坡折，其沉积滨线坡折难以识别。本文拟就将特定井的位置作为参照物，来划分陆相层序及其体系域。文中采用泌207井作为参照井的结果显示，研究区核三上段所划三个层序发育Ⅰ型层序界面一个、Ⅱ型层序界面三个。按“体系域具四分性”论点，发育齐全的四个体系域具五个界面，除顶、底界面归属层序界面之外，其它三个界面皆为体系域界面。小层序界面是一次次小规模的洪泛作用的记录，从盆缘至盆内表现为洪泛面及可与之对比的相当界面，洪泛面属沉积微相转换面。
Because of the sudden slope collapse from steepness to steepness on the ancient terrain in the steep slope fault basin, it is difficult to identify the sedimentary coastline slope. This article intends to use the location of a particular well as a reference to classify the terrestrial sequence and its system domain. The result of using well 207 as a reference well in the paper shows that there are three types of type Ⅰ sequence interfaces and one type Ⅱ sequence boundary interface in the three sequences of the upper third section of the study area. According to the argument that “the system has a tetrad,” the four fully developed system domains have five interfaces. Apart from the top-and-bottom interfaces, the other three are system-domain interfaces. The small sequence boundary is a record of small-scale floods. From the basin edge to the basin, it shows the flood surface and its comparable interface. The flood surface is a sedimentary micro-facies conversion surface.