Sedimentary Microfacies of Fuyu Reservoir in the Southern Taipingchuan Area of Songliao Basin

Based on elaborate core observation,the main lithology including mudstone,silty mudstone,siltstone and pack sand is recognized.According to the analysis of the color of mudsthone, sedimentary structure and logging data,the results show that well-developed shallow delta of Fuyu reservoir can be further divided into two subfacies,delta plain and delta front,branch channels and sub-water channels which frequently present high curvature,channel crossing and flood fan are their main forming units,from Q3-sq1~Q4-sq3,sedimentary water becomes shallow gradually,which is obvious during the period of Q3-sq4,from Q4-sq3~Q4-sq1,the sedimentary water is getting deeper, which can be shown by continuously variational sedimentary facies;and widespreaded sandtone of channels and flood fan with favorable reservoir physical property are worth for further exploration.