Abstract: On the basis of studying numerously of field geological and drilling profiles of the Bottom Permian System in the Northwest of Sichuan, combine forefathers research results, propose this area have both characteristic of carbonate platform and carbonate ramp at Chihsia Age in the Early Permian Period, called the Honmogeneous Oblique Platform environment. It is thought that The Honmogeneous Oblique Platform Margin Shallow Water High Energy Organic Bank is the best for the development of the reservoir through the analysis of its sedimentary characteristic, mainly distributed on the Tianjing MountainGuangyuan Northwest Township bring at Chihsia Age Two, thickness heavy, distribute relatively wide, is the best facis belt for exploration. Deep Ramp and Basin environment are relatively favorable to the formation and evolution of the oil and gas, mainly distribute northwestern First Chihsia Formation and Second Chihsia Formation in this area.

Key words: Sichuan Basin, Permian Period, The Honmogeneous Oblique Platform, sedimentary characteristic, reservoir distribution