The Research Of Preponderance Flow Path Of Kongyi Formation In Wangguantun Oil Field West District

After more than 30 years' water injecting,reservoir of Kongyi Formation in Wangguantun Oil Field West District,have been entered the middle-last stage of development.With the increasing of water content,reservoir heterogeneity become stronger,and contradictions between and within layers get more and more prominent.Some reservoir with high permeability have already developed preponderance flow path,which leads to low efficient even invalid water injection,seriously impacting water injecting development effect.Considering the problems above,using core analysis test data,log data,tracer monitoring data and production performance data,this article analyzes the change characteristics of reservoir parameters and log response before and after water injection,and establishes the preponderance flow path identification standard which can be used in the whole study area,and the generalizes the development characteristics of preponderance flow path.Research shows that preponderance flow path mainly develops in micro facies of mid-channel bar and braided channel of Zao ? and ? oil set,and micro facies of underwater distributary channels and river mouth bar of Zao ? and ? oil set.The layers,which preponderance flow path developed more,concludes Zao?-4-1,Zao?-4-3,Zao?-5-2,Zao?-1-2,Zao?x-1-3,Zao?x-1-4 and Zao?x-2-2 single sand layer.Finally,this article analyzes main controlling factors influencing the formation of preponderance flow path in study area,via internal geological and external development factors.It considers that reservoir's physical differences caused by different types of micro facies and paleocurrent direction,as well as heterogeneity,influences flowing of injection water,and then impacts the distribution of preponderance flow path.The long-term water flooding leads to a range of changes of undisturbed reservoir,which influence the formation of preponderance floe path.