The Study On High-resolution Sequence Stratigraphy And Reservoir Of Fuyu Oil-bearing Formation In The Block Zhou201, Zhaozhou Oilfield

Based on the study of the Fuyu formation in Daqing peripheral Zhaozhou oilfield, the paper has discussed the high-resolution Sequence Sratigraphy,and reservoir description method to provide a new method for the high-efficiency development method. Daqing peripheral Fuyang formation belongs to the " low porosity, low permeability, low production" oilfield. The reservoir is not favorable. The sand distribution changes quickly. The distribution relationship of sand and water is complicated. There is about 3.7×10~8t reserve untouched. Through the application of High-resolution Sequence Stratigraphy and reservoir description to enhance the production of single well and the progress reserves producing steps, which has great guidance for the large-scale development of Fuyang formation.Stratigraphic correlation is the basis of geology study, which is same to this paper. Under the guidance of the High-resolution Sequence Stratigraphy, the well logging and seismic data has been used for the correlation in Block Zhou 201, which has been divided 2 long term cycle, 4 middle-term cycle and 19 short term cycle. Through the precise correlation, The High-resolution Sequence Stratigraphy has been build to provide the innovative correlation plan for the detailed analysis of the vertical sequence, structural pattern and over-lap style of each individual base level sequence cycle.The seismic facies and inversion which are under controlled by the sequence frame is another important task for the paper. Under the isochronal High-resolution Sequence Stratigraphy, through the comprehensive analysis of several properties of geological facies, the lateral and spatial distribution patterns of each individual sequence cycle and sand has been cleared. The paper has drawn the conclusion: The source comes from the north braid river delta to the lake. The river plays a dominant role and the underwater distributary channel migrate quickly and make the front lobate migration change, which has made the sand distribution more complicated. Based on this theory, the well logging facies has been built.To describe the sand distribution more precisely, the High-resolution Sequence Stratigraphy interpretation has been used and the limited seismic reflection event has been studied clearly to interpret and trace the formation. The isochronal High-resolution Sequence Stratigraphy has been applied in Block Zhou201 of Zhaozhou oilfield to improve the High-resolution Sequence Stratigraphy frame more precisely.Based on the above study and research, The oil-bearing mechanisms of Block Zhou201 of Zhaozhou oilfield have been discussed and found three favorable layers: FI5, FII1 and FIII5. These 3 layers distributes mainly in the middle part (well Z31-301) and northeast part (Z29-291) of the study area.