Abstract: Aiming at the problem that the contradiction of the production of Bohai BN oilfield have become increasingly prominent in the later development stage. By use of a four-in-one method of log-seismic and dynamic-static, and relying on three-dimensional fine reservoir characterization and numerical simulation technology, the connectivity of the single sand body and the distribution of oilfield remaining oil was studied. By making full use of the dynamic data and combining with log-seismic response, the distribution model of complex channel was constructed,and the geological knowledge was revised and the three-dimensional geological model was fed back. The reservoir recognition of b sand body was formed that the vertical three phase sand bodies was superposed, multiple channels was migrated and bifurcated frequently, the contradiction between geological knowledge and reservoir dynamics was solved, the connectivity of the sand body was subtly depicted and the residual oil distribution was quantitatively characterized. By new drilling data and dynamic data validating, the compliance rate was more than 80%.