Analysis On Remaining Oil Distribution Patterns Of The Upper Formation Of Guantao Group In The West Part Of 7^th Block, Gudong Oilfield

Taking the internal potential block of the west seven area of the upper member of Ng Formation in GuDong oilfield as the research target,on the basis of synthesizing predecessors' achievements,this paper reviewed the stratigraphic correlation,established the high resolution isochronous stratigraphic framework on the principle of cycle correlation and summarized core and logging response characteristics of the configuration unit of braided and meandering river reservoir.Basing on the porosity and permeability data of core analysis,the paper compiled the cumulative probability curves of porosity and permeability of Ng5?Ng6,divided the reservoir into three types: III?III and III and predicted the planar quality distribution of main reservoir with the porosity and permeability model interpreted by well log.On the principle of injection-production correspondence,analysis of oil and water movement and validation of waterflooded interpretation well,the results showed the flooding area with strong planar heterogeneity and the middle and low water flooded layer with considerable remaining oil by analyzing the waterflooded characteristics of the optimized injection-production well group centered on the existing water wells.On this basis,from the perspective of development geology,this paper discussed the three major factors on the formation of remaining oil in the study area.And then,by analyzing the planar and profile characteristics of the optimized injection-production well group from the three main control factors of reservoir configuration,reservoir quality and development engineering,10 kinds of remaining oil distribution patterns of the study area were summarized on which the planar remaining oil distribution of the main layers was predicted in the research area.The remaining oil in the study area are mainly distributed in configuration unit composite parts and III ? III reservoir internal and injection-production weak corresponding area.