The Bohai River facies oilfield has the characteristics of thin reservoir thickness, poor lateral connectivity of sand bodies, unstable distribution, and well-developed edge and bottom water. The formation and distribution of remaining oil in the reservoir are complex. B sand body in the lower member of the Neogene Minghuazhen Formation is a structural-lithological reservoir developed by horizontal wells, which is typical of meandering fluvial deposits. Contradiction of dynamic production performances occurred after it went into production, wells in its northwestern part flowed with high yield with no water, whereas wells in the southern part were pumped with low yield and water cut increased quickly up to 80%. Causes were analyzed based on seismic, well logging, drilling and dynamic data. Oil flowed to surface in Well A9 and A12H of the northeastern part due to edge water drive, A12H was also affected by gas cap. A15H and A16H were located in the southern part near edge water, which led to rapid rise of water cut due to secondary bottom water caused by quick breakthrough of edge water. Therefore, areal and vertical heterogeneity is the main influencing factor bringing about the contradiction of dynamic production performances between southern and northern part. Based on above understandings, remaining oil distribution was analyzed.