There occur from west to east the (fan) delta or shallow, semi-deep and deep lacustrine deposits which are assigned to three depositional systems.

• 自西向东依次出现（扇）三角洲／浅湖、半深湖、深湖沉积，可划分为三种沉积体系，有利沉积相为（扇）三角洲前缘及浊积岩；