| According the geological characteristics and the status of the development in the reservoir of Dalujia area,conducted by Petroleum geology, modern sedimentology, sequence stratigraphy etc,and by means of computer technology, This study was studied based on the comprehensive application of a variety information for exploration and development.And the second member of Shahejie formation was maked fine contrast divided though geological,logging,testing and seismic data.Based on the analysis for the sandbody distributiong. The rupture distribution of fault and structural characteristics of the study area can be studied.And the major fault and the important fault block can be analyzed the structural implementation and sedimentary facies can be studied clearly. Finally, the sedimentary facies is divided into sedimentary facies Microfacies.Base on the structure formation and ebolution analysis of Humin sag,the paper study the fine structure to the second members of the Shahejie formation through the three-dimensional seismic, drilling and other information in this area, and gradually clear development and distribution of small faults and distribution characteristics of the small micro-structure.Though the principles and methods of the sequence stratigraphic study ,The sequence stratigraphic framework was set up in the study area based on the comparison of the profile skeleton, The second member can be divided into 5 layers, 42 sublayers.In the formation the 1st layer can be divided into 11 sublayers,the 2nd layer into 11 sublayers,the 3rd layer into 6 sublayers, the 4th layer into 8 subsayers, the 5th layer into 6 sublayers,Based on the previous studies, through the core observation,sedimentation background and sedimentary characteristics we make a study to reservoir sedimentary microfacies and we consider the area mainly lie in the delta front facies belt. Sedimentary microfacies mainly have underwater distributary channel, disral bar, sand sheet, and distributary bay.
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