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The Songnan 142 block of Qinjiatun Oilfield has entered the high-water-contain stage after years of exploitation�� In order to analysis the relation of inection to production��predict the distribution of remaining oil and promote the oil recovery��we have studied the reservoir flow unit in this area�� On the basis of the drilling core and well logging data��we found that there were four microfacies in this area��including the underwater distributary channel��underwater distributary interchannel��mouth bar and sheet sand�� The Nong VIII --Nong V area showed an integrand deposition of fan delta front�� Using the multi-parameter fuzzy cluster analysis��we divided the reservoirs of this area into five reservoir flow units of A��B��C��D and E in decreasing order of frequencies��and built the standards of types of reservoir flow units�� Based on the study of the distribution of reservoir flow units��we analyzed the injection-production relation between the oil wells and water wells and also predicted the favourable zones of remaining oil�� The results with production performance data were checked��which showed the consistency of the theory analysis results and the actual production conditions��