The sedimentary characteristics of Neogene Shawan formation reservoirs are subtle and complex.Based on the regional geological condition，existing core，logging and other various geological material，we analyzed the sedimentary characteristics of Shawan formation.The Shawan formation mainly developed braided river fan sedimentary system，which can be divided into three parts including proximal subfacies，middle subfacies，and distal subfacies.The middle subfacies，and proximal subfacies are developed with wide range of braided river sedimentation，and can be divided into braided river，channel bar，and distributary between sedimentary microfacies.The content of sandy conglomerate is high，and the lithologic is coarse，which has less fine grained suspended sediment.The logging curve feature in study area is apparent.The Shawan reservoir is made up of the channel sand body which is from the southwest and northwest，and formed the large complex lithology reservoir distribution.