 The study found that the Sengtomu area is composed of a braided river delta front sedimentary system, with a backbone underwater distributary channel and branch type underwater distributary channels. The backbone channel has a larger rock grain size and a box-shaped logging curve, while the smaller scale branch channels have a bell-shaped logging curve due to the weakening of water energy. These two types of channels overlap, creating thick sandstone bodies. The architecture interface between the channels can act as a barrier against bottom water intrusion, and the remaining oil is concentrated in this area. This article was authored by Chao Wang, Chen Jingyan, Xing Junzhu, and others.