This paper has divided the sedimentary facies of Feixianguan Formation , and analyzed the distribution of oolitic limestone beach body.

Oolitic beach reservoir is of fractured or porous reservoirs which include oolitic limestone and dolomite. It is a high gas production reservoir in northern Sichuan province.

The Feixianguan formation's reservoir lithology included all kinds of grain dolostones and fine-crystal dolostones remaining grain apparition exluding the limestones.