Abstract: The sediment source in the north area of Jinglou oilfield is not obvious,which causes the indistinct of the distribution of sand body and restricts the development of the oilfield. Through comprehensive analysis on core data,logging data and chemical experiment data,the sediment source in the north area of Jinglou oilfield is considered to come from Gucheng delta which lies to the northeast of Jinglou oilfield. The research area is at the end of delta front and there are five main kinds of sedimentary microfacies,distributary channel,mouth bar,sand sheet,interchannel and lake mud. Combining the distribution of the sand and the sedimentary microfacies,the sedimentary pattern of the research area has been established.According to the sedimentary pattern,the plane distribution of the reservoir microfacies and sand are researched,which is of significance for the development of oilfield.