Author(s)

Caixia Gao, Caihong Gao, Yingjiao Li and Longyi Shao

Corresponding Author

Caixia Gao

ABSTRACT

The upper triassic xujiahe Formation which is divided into seven members in eastern Sichuan Basin deposits a set of clastic rocks with black mudstone, siltstone, fine sandstone, sandstone, gritstone and coal. The first, third, fifth and seventh members are coal-bearing intervals, while the second, fourth and sixth members are sandstone-rich intervals. According to the rock types, the supply of source, formation mechanism and sedimentary sequences, and combined with regional geological features, Xujiahe Formation is identified three sedimentary types of lake face, delta face and fluvial face. At last, the sedimentary model of fluvial plain-delta-shallow lake is established.

KEYWORDS

Easter sichuan basin, upper triassic, xujiahe formation, sedimentation model