运用沉积厚度印模法对延长组沉积末期的古地貌进行了恢复，认为延长组顶部侵蚀古地貌格局为“两下切河谷、两斜坡、中间一残丘”。在此基础上，研究了这种格局对侏罗系油藏的控制作用，主要表现在侵蚀斜坡和残丘对上覆地层沉积环境、沉积相、砂体展布的控制；下切河谷不但为油气运移提供通道而且控制着油气运移方向；古地貌高地控制着差异压实小幅度背斜或者鼻状构造的相对高点。

This article uses the sediment thickness impression method to rebuild the palaeogeomorphology of the Yangchang Formation top, and reveals that the palaeogeomorphology is “two incised valleys, two slopes and a remnant earthen mound in the center”. The study on the relationship between the palaeogeomorphology and the Jurassic reservoir shows that the Jurassic reservoir is mainly distributed on the high places of the slopes and the remnant earthen mound, and the mouth of the remnant earthen mound and its adjacent slopes are the main places of oil and gas accumulation. In terms of the three aspects of storage, transportation and preservation, the paleogeomorphology of the Yanchang formation top controls the earlier Jurassic reservoir: the eroded slopes and the remnant earthen mound control the upper sedimentary conditions sedimentary facies sandstone distribution, the incised valleys are not only the migration channels but also controls the migrating direction, and the paleogeomorphic high land controls the relatively high places of structures formed from differential compaction.