Abstract：Aiming at the following characteristics of Fuyu Oil Layer in Lamadian Oilfield, i. e. , the sparseness of wells,the denseness of the seismic data,we solve the difficulty which are sequence division and the research of sedimentary facies because of the sparseness of wells by using the method and the technology of Seismic sedimentology. The results show seismic amplitudes can be correlated to log lithologies and the interpretation accuracy can be improved by using 90?phase seismic data. The technique of stratal slices can identify the boundary of three 4th-order sequences (SQ1,SQ2,SQ3) in seismic profiles. The sedimentary facies of 4th-order sequence have been characterized by combining seismic data with lithologic log data.Through analysing the sedimentary facies, we obtain that the dominant sedimentary facies are distributive river and flood land; and at the same time we know that the target zone mainly experienced from deltaic plain to deltaic-front.