Braided-river deltas that braided river systems prograde into an inland lake are first found in the Palaeogene Shahejie Formation in the Gudong area, Shengli Oil Field.

• 胜利油田孤东矿区老第三系沙河街组中发现丰富的湖泊辫状河三角洲沉积物,其特征显著,明显有别于其他类型的三角洲,可见到8种特征各异的微相。