Based on the stratigraphic framework, the sedimentary facies of the fourth and fifth members of Xujiahe formation in the whole Sichuan basin is thoroughly investigated.

• 通过研究认为，须四段主要为灰黄色、灰白色厚层中细砂岩，发育三角洲平原沉积和三角洲前缘沉积；