Study on Sedimentary Facies of Chang 6 Oil-bearing Formation in Baimayaoxian-Miaoju Aera,Ordos Basin

By integrating data of core test,logging analysis,structural characteristics,lithology and so on,sedimentary facies of Chang 6 formation in Baimayaoxian-Miaoju area were studied.The results show that sedimentary facies of Chang 6 formation are delta front intrafacies,which can be further divided into four types,including underwater distributary channel,mouth bar,natural barrier and interdistributaey bay.At the same time,the sedimentary microfacies control hydrocarbon migration and accumulation,underwater distributary channel and mouth bar are favorable area of hydrocarbon accumulation.