The submarine fan with completely inner, middle and outer fan can be divided into progressive and regressive sequence, which were composed of sandstone bodies formed by turbidity flow.

• 海底扇具有完整的内扇、中扇与外扇组合，可划分出进积型和退积型两种序列类型，它们多半是由浊流形成的各种砂体组成的。