Fine Description Of The Water Flow Dominant Channel In The Kexia Formation Reservoir In Yizhong District,Junggar Basin

The reservoir of the Karamay Formation in the central area of the Junggar Basin is highly heterogeneous,especially in the later stage of development.As the interstitial migration,the heterogeneity is further aggravated.After more than 60 years of development,the contradictions in the layer have intensified,the water shovel in the upper part of the plane is serious,and the injection in the south is not effective.The accumulated water injection in individual wells is large,the effect of surrounding oil wells is not obvious,and there is obvious uneven water absorption in the longitudinal direction.The law of underground flow movement is complicated.This indicates that there is a dominant channel for injecting water and water flow in the reservoirs of the Karamay group in the central area,both in the layers and between the layers,and in the longitudinal and planar directions.The so-called water flow dominant channel refers to the dominant flow path of injected water formed by the reservoir due to geology and development.In this paper,the reservoirs of the Kexia Formation in the central area are taken as the analysis object,and the dynamic and static characteristics of the formation of the dominant channel of the water flow are studied by using dynamic and static data.The idea of this paper is: firstly,using static data to analyze the geological conditions of the reservoir's dominant channel of water flow,establishing the criteria for finding the dominant channel,and analyzing the main controlling factors of the dominant channel of the water flow;secondly,analyzing the dynamic data such as the liquid production and water absorption profile and the flooding status.Determine the dynamic response characteristics of the dominant channel of the water flow,further verify the dominant channel and specific location of the water flow formed in some parts of the reservoir unit,establish a water flow dominant channel mode,and use the water shutoff profile control layered water injection and dynamic deployment for the next step.Ways to improve the injection water volume and volume coefficient provide a basis.According to the study of the dominant channel of water flow,the dominant channel of the water flow in the Kexia Formation is mainly distributed on the two sand layers of S7 and S5.The dominant channel of the S7 water flow is especially developed,and the waterlogging is serious.Its distribution characteristics are mainly constrained by geological factors.The Kexia Formation mainly develops alluvial fan deposits,and the dominant channels are mainly distributed in the fan root and the middle part of the fan.The degree of superiority of the channel is also affected by the degree of development.According to the research,the dominant channel in the fan is more developed than the fan root.