Sedimentary Facies of the third section of Funing Formation and Hydrocarbon Distribution in the Northeast of North Slope in Gaoyou Depression

Based on basis of the observation and analysis of cores, thin section of coring wells,and a lot of logging data,sedimentary features and facies in a single well,in section and in plane are studied.The analysis of facies show that the sand bodies of the third section of Funing formation in the northeast of North Slope in Gaoyou Depression belong to a delta deposits including delta front and pro-delta subfacies.The delta front is furthmore divided into subaqueous distributary channel,mouth bar,the distal bar,sheet sand and delta-frontal facies.The sedimentary microfacies study reveals its effect on the reservoir quality,and the relationship between oil distribution and the different kinds of sedimentary microfacies.The results show that subaqueous distributary channel and mouth bar are the main accumulation facies,having best reservoir quality and highest production,and the frontal sheet sand and far bar sand are relatively poor,and delta-front sand is the poorest having no oil production.