The Utilization Of The Reservoir Dissection Technology In The Advancement Recovery Ratio Of Polymer Flooding

Based on the modern sedimentary theories, field geological survey and the sedimentary characteristics and interfaces shown by well log data of high density well pattern, this thesis indicates gradually the geometry and structure of the sandy body from the large and rough to small and fine, and describes the sedimentary model of PI1-2 formation of Lamadian Oilfield in detail by the method of model prediction and description. The relatively geological model was established, and eight reservoir microfacies suit for oilfield development were partitioned. Using the cause of formation, and reasonable sandy body's dissection, the boundary of sandy bodies was identified in prediction. As result of it, the composite sandy body was dissected into single sandy bodies. Five structural interfaces–distributing patterns were built; and six structural unit-distributing patterns were divided. Through the practice of the oilfield development, showed that structural interface is the key factor of controlling remaining oil. Intraformational remaining oil is mainly distributed in the overlying of the structural unit. What's more, the growth condition of structural interface and the developing law of the structural unit are the foundation of searching remaining oil. Completing the injection-production of the structural unit through perforations adding is a powerful way to exploit potentialities of the remaining oil in the oil layer. By analyzing the heterogeneity of formations, the static and quantitative description model applied to divide the flow unit of formation was established, which directed oilfield development.Based on above-mentioned research, combined with the connection of single sandy body and flow unit, the geological factors which influence the impacts of polymer flooding and the dynamic changes after polymer flooding of different wells are analyzed. The type of rhythm, connectivity, microscope structure, empirical relationship between oil saturation before polymer flooding and the effects of improving the recovery after polymer flooding are given. And all of these have been widely applied in the identifying the remaining oil distribution and analyzing the stimulation effect. The research findings provide clues to the programming of the oilfield polymer flooding development, the adjustment after it, and the geological achievements of improving its effect.