Study on the sedimentary facies of Sangonghe formation in Huo Yanshan oilfield

Based on core and logging analysis,with regional sedimentary characteristics and sedimentary facies distribution,Sangonghe formation is delta deposit,and four microfacies are identified,including underwater distributary channel,tributary bay,mouth bar and sheet sand.The lithology is mainly grey mudstone,pelitic siltstone,off-white glutenite,pebbly sandstone and fine sandstone.Sand bodies of underwater distributary channel are major oil bearing series for great sand body connectivity.The study of sedimentary microfacies will finally provide geological basis for efficient exploration and development of the oilfield.