Study on Sedimentary Facies' Types and Distribution of the Guantao Formation in Raoyang Sag

Based on the core observations、logging data interpretation and the distribution characteristics of sand body,we have taken a comprehensive analysis to sedimentary facies,inferring that Guantao Formation of Raoyang Sag is stream depositional system.The lower segment of Guantao Formation is braided stream.In the plane,two kinds of fluvial sedimentary systems are widely developed in the study area and the river channel shows a banding distribution in NNE;In the section plane,the braided stream channel overlay each other and the meandering stream channel is isolated.