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通过对东濮凹陷西部洼陷南段的地震资料详细解释，结合沉积学研究，划分出了下第三系与下伏基岩之间的界面。这个界面在地震剖面上表现为下伏反射层系的削截终止和上覆反射层系的上超与下超。界面上、下地层的层速度变化大，反射波组特征差异明显。以往认为该区沙三段和沙四段厚度小（甚至缺失），根据界面之上的反射特征及合成地震记录的地质层位确定，认为区内沙河街组自沙四段至沙一段均发育，但沙四段仅分布于李寨地区以北，最大厚度为５００ｍ。
Based on the detailed interpretation of the seismic data in the southern segment of the western depression of Dongpu Depression and the study of sedimentology, the interface between the Lower Triassic and the underlying bedrock is divided. This interface appears as seismic cut-off of the underlying reflection system and over and under the overlying reflector system in the seismic profile. The layer velocity changes greatly in the upper and lower strata of the interface, and the characteristics of the reflected wave group are obviously different. In the past, the thickness of the Shahejie Formation and the Shahejie Formation in this area is small (or even missing). Based on the reflection features above the interface and the geological stratigraphic records of synthetic seismograms, it is considered that the Shahejie Formation in the area developed from Sha 4 to Sha 1, However, the fourth member of Shahe is only distributed in the north of Lizhai area with a maximum thickness of 500m.