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构造断阶带包括陡坡和缓坡断阶带。因地形差异，陡坡和缓坡对砂体的控制作用存在明显不同。低水位期，陡坡一侧发育冲积扇、扇三角洲；缓坡一侧发育河流冲积平原、小型冲积扇或三角洲。湖进期，陡坡一侧由岸向湖，不同断阶上分别发育冲积扇或扇三角洲的近 中端，中 远端，在靠近深洼部位发育湖底浊积扇或其它重力流沉积体；缓坡一侧，则表现为前期沉积的砂体向物源方向的退积。高水位期，因地形变缓断阶作用变小，整体表现为三角洲向盆地的进积，呈延长楔形或透镜状。另外，断阶中断裂活动的先后次序和迁移方向，对砂体的分布也有明显控制作用。运用这些规律，可为在地震剖面上预测砂体提供有效约束
Structural fault strata include steep slopes and gentle slops. Due to the differences in the terrain, steep slopes and gentle slopes have obvious different control effects on sand bodies. In the low water level, alluvial fans and fan delta are developed on one side of steep slope; river alluvial plain, small alluvial fan or delta are developed on the side of gentle slope. On the steep side of the lake, alluvial fan or other gravity flow sediments are developed near the alluvial fans or fan delta, middle and distal ends of the fan delta, respectively. One side, the performance of the sedimentary sand bodies to the source direction of the retreat. The period of high water level is smaller due to the relief terrain, and the overall performance is the sedimentation of the delta to the basin, with an elongated wedge or lenticular shape. In addition, the sequence and migration direction of the fault activity in the fault-step also have significant control over the distribution of the sand body. Applying these rules can provide effective constraint for predicting sand bodies on seismic sections