Identification Of Predominant Percolation Channels In Putaohua Reservoir Of Pubei X Fault Block

After 30 years of development,Pubei X fault block has entered the late stage of waterflooding development.After a long period of waterflooding development,reservoir pore structure changes due to the erosion of injected water and heterogeneity of reservoir itself.Injected water mainly spreads along the high permeability layers of each sedimentary unit,resulting in basically unchanged water washing thickness,which is not conducive to the improvement of oil and water wells in some reservoirs.It is very difficult to enlarge the sweep volume of water flooding because of the inefficient and ineffective circulation of a large number of injected water along the large channel,which results in strong water flooding and high water cut of oil wels,reduces the production of oil wels,and seriously affects the development effect of water flooding in oil fields.Therefore,it is urgent to identify the dominant seepage path of Putaohua reservoir in Pubei X fault block.According to the actual situation of Pubei X fault block,combined with the cause of formation of dominant channel and the characteristics of dominant channel in development,this paper optimizes the channel identification method to identify the dominant channel of Pubei X fault block.The dynamic and static parameters are identified by injection-production splitting,connectivity and sedimentary correlation,and the influencing parameters are optimized by grey correlation method as the factor set of the fuzzy algorithm,and the weight parameters are calculated by analytic hierarchy process as the weight set of the fuzzy algorithm,and the channel is identified synthetically.In order to ensure the accuracy of the recognition results,the validation and application of the recognition results are carried out,which provides data basis for subsequent dominant channel governance and other aspects.Through dynamic and static identification and mathematical fuzzy algorithm,this paper identifies the dominant channel of Putaohua reservoir in Pubei X fault block,gets the result of well identification,carries out dynamic verification and compiles the dominant channel identification software,and finally forms a complete dominant channel identification system.