Abstract: Taking the Es₂⁸ Formation in the second district of Shengtuo Oilfield as an example, using the cores, dynamic monitoring data and dense well condition, this paper adopts the research methods of hierarchical control and dynamic fit. It analyzes the types, causes and architecture hierarchy of barrier-interlayers in the mouth bar. It also deeply discusses the position, shape, extending scale and distribution patterns of barrier-interlayers in different orders. The research shows that barrier-interlayers can be divided into three types:muddy barrier-interlayers, calcareous interlayers and physical barrier-interlayers. Five-order barrier-interlayers limit the composite mouth bar. Five-order barrier-interlayers which contain muddy barrier-interlayers, calcareous interlayers and physical barrier-interlayers are located at the top of the composite mouth bar. Muddy barrier-interlayers and physical barrier-interlayers are lateral stitching, sheet size and easy to form a stable barrier. Calcareous interlayers are discrete and non-continuous. Four-order interlayers limit a single bar. Four-order interlayers are located at the stacking part of single bars. Muddy, physical and calcareous interlayers of four-order extends along the top of the single bar. They are oblique crossing laterally and discrete. There-order interlayers limit the proliferative bodies. Muddy, physical and calcareous interlayers of there-order are multiple, thin, discrete and non-continuous. These interlayers distribute between the proliferative bodies and incline to the lake.

Key words: barrier-interlayers, patterns, mouth bar, architecture hierarchy, Shengtuo Oilfield