Organic reefs gas reservoirs such as Longgang, Puguang, Huanglong and Wubaiti were found in northeastern Sichuan area. They are characterized by thick reservoirs, larger areas and abundant reserves, thus suggesting wide exploration and development prospects. In northeastern Sichuan, reefs are mainly divided into platform marginal reef and point reef in platform, with obvious different characteristics. The platform marginal reef is characterized by large scale, intact facies belt of reef combination, strong water energy, control by paleogeographic location and paleogeomorphic environment, and cluster distribution mainly on both sides of the oceanic trough.