As an important type of terrestrial oil and gas reservoir, the shore-shallow lacustrine sand bar is generally parallel to or intersected with the lake shoreline at a low angle. But the Suweiyi Formation in the Dalauba area presents distinctive spatial distributions characteristics besides the shore-shallow lacustrine depositional features. In order to elaborate the sedimentary characteristics and to establish the ideal sedimentary model of the Suweiyi Formation, on the basis of previous research, such as the detailed core observation, rock-mineral identification, lithofacies description, log facies analysis, wave impedance inversion, seismic facies characterization, and so on, are all have been implemented in this study. The results show that the shore-shallow lacustrine sand bar of the Suweiyi Formation in the Dalaoba area can be vertically divided into two sections. The lower section is dominated by shore lacustrine sand bar formed in shore lake facies, and the upper section is dominated by shallow lacustrine sand bar formed in gradually-deepening shallow lake facies. The shoreland sand bar is consistently developed in the south part of the study area. Both the shore-shallow lacustrine sand bar and the shoreland sand bar can be further divided into the bar-center, the bar-lateral, and the bar-shoal microfacies. The shore-shallow lacustrine sand bar developed in the central area is nearly perpendicular to the eastern lake shoreline. It is speculated that the special space distribution is mainly controlled by the underwater uplift, the lake water circulation and the sediment source. The clarification of the genesis of this kind of reservoir has important guiding significance for the exploration and exploitation program in the study area.