Delt-frong acclivity and shallow lake are a major type of sedimentary sub-facies of the Suining formation of Upper Jurassic, and the provenance is uplifted area of Longmenshan. Most of gas-producing formation are located in favorable sedimentary microfacies, such as shallow lake sandbar, river mouth bar, underwater distributary channel and distal sandbar with thick sand body. These sedimentary microfacies control the distribution of sand body, and moreover, they control the area and bound of gas accumulation. The sand body thickness and sand grain of gas-producing horizon are lies on incumbent relation of different microfacies. The production has direct affiliation with porosity, permeability, porosity texture. The gas migrated from deep formation to structural high of Suining formation and formed compound gas pools of structural-lithology, and syngenetic fracture is crucial to gas production. The further exploration should look for reservoir of high quality located at appropriate structural and developed area of syngenetic facture.