By quantitative identification technology of well logging facies，this paper rapidly and efficiently identified sedimentary microfacies of a single well and fully compared the sedimentary micro-facies of Neogene Guantao Formation（Ng）in block LZ9 of Linfanjia Oilfield. Furthermore，the boundary of each sand body in the 6th Submember of the 4th Member of Neogene Guantao Formation（Ng46）was finely described through multi-parameter coupling analysis in terms of paleogeomorphy，seismic attributes，and plane distribution characteristics of oil and water. According to the fine description，Ng in block LZ9 belongs to fluvial facies sediments which mainly develop sedimentary microfacies of the channel，natural levee，crevasse splay，and flood plain. The course of the channel in Ng46 is NW-SE，and the sand bodies are widely developed in the channel. These sand bodies have a banding distribution and extend as far as 3-5 km，with a width of more than 600 m.The natural levee is intermittently distributed in a narrow band or pod structure on both sides of the channel，with a width of less than 100 m. The connectivity of sand bodies in the channel is positive，and the injection-production efficiency is high.However，the lateral connectivity of the natural levee reservoir is poor，and the injection-production efficiency is low.