The sedimentation environment transformed from the fluvial and lake facies to the shallow sea facies, and finally to the deep sea facies.

In this paper, it is suggested that the Ordovician sedimentary facies in the Yichang region are a combination type consisting of platform facies, platform margin facies and shallow sea basin facies.

Reservoir formed in the turbulent and oxidized environment, for example alluvial fan facies, fluvial facies, delta facies, aeolian facies aad shallow-sea facies etc.