河湖动力作用,在一定的沉积环境中,可以形成一定类型的小旋回。河流为正向小旋回,滨浅湖为反向小旋回,三角洲为复合或反向小旋回等。这些小旋回在地层剖面上的有机组合,正是地史时期沉积环境变迁的真实记录。因而,应用小旋回组合方法,可以划分沉积相带,重建古环境。 River power, in a certain sedimentary environment, can form a certain type of small cycle. The river is a small positive cyclone, a shallow shallow lake for the reverse cycle, the delta complex or reverse small cycle and so on. The organic combination of these petty cycles in the stratigraphic section is a true record of the changes in the sedimentary environment during the geo-history. Therefore, using the method of small cycle combination, the sedimentary facies belt can be divided and the paleoenvironment reconstructed.