Study On The Fine Reservoir Description And Remaining Oil Of The Upper Guantao Formation In The District Of Chengdao Oilfield

Fine reservoir description and the study of remaining oil distribution of Upper Guan Tao formation of east district of Cheng Dao oil field was made by stratigraphy fine correlation、structural and fault system、depositional facies type、Sand spatial distribution and distribution of oil and water. 3D geological model of east district of Cheng Dao oil field was established with deterministic method by which the geological reserves was calculated. The water flooding and remaining oil distribution was studied with data of production and numerical modeling technique which rebuild the production history. The study have important guidance role for improving the development effect、increasing oil production and constant rate of production of developed oil field offshore, which will increase the production of maturing field.Step by step subdivion correlation way was used in 1-6 sands group of Upper Guan Tao formation of east district of Cheng Dao oil field, 30 single layer and 52 time unit was divided in this study. Fine structure、minor structure study was made by which the structure and fault system of east district of Cheng Dao oil field was clear. Based on the study of main body of Cheng Dao oil field, Seven microfacies, including main channel、channel margin、levee and crevasse, etc was divided in east district of Cheng Dao oil field. The fine sand description was made with logging restraining seismic inversion work, the reservoir and oil reservoir characteristic was made, and the oil-gas-water relation was made. Based on the logging restrained seismic inversion work, together with the sedimentary characteristic,The 3D geological model was made with deterministic method, with the 3D data body into the numerical modeling, the integration study of geological modeling and numerical modeling was achieved. The study was made with numerical modeling technique and reservoir engineering comprehensive analysis method which show that the remaining oil mainly distributed in the vicinity of fault、injection-production non-mainstream line area and imperfect injection-production well pattern area. Among the Interlayer, water flooding in main layer is obvious, but in which remaining recoverable reserves is bigger; in the layer, the flooding is apparent in the high permeability interval of the bottom, and the remaining oil is rich in the middle-low interval of the top. The research result was applied in the development to adjust and deploy east district of Cheng Dao oil field。Based on the development technique policy study, the economical limitation、development method and pattern was decided, still the rational injection and development parameters are calculated and the feasibility study of horizontal well was made. Based on the finished adjustment plan of east district of Cheng Dao oil field, the contrast prediction and risk analysis of adjusted effect was done.