Fine Reservoir Description And Remaining Oil Distribution Of Funing Formation In Sha 14-sha 30 Fault Blocks Of Shanian Oilfield

Sha 14 fault block and Sha 30 fault block belong to Shanian oilfield,the main development oilfield of Jiangsu Oilfield.They are located in Gaoyou City,Jiangsu Province,in the eastern coastal area of China.Sha 14 fault block is a typical ultra-low permeability reservoir with poor reservoir physical properties,low oil well productivity,ineffective water injection,and poor water injection effect;Sha 30 fault block is a typical narrow strip medium permeability reservoir with high natural productivity at the initial stage of oil well,but the oil-bearing zone is narrow,the water cut rises rapidly after water injection,and the production continues to decline.Based on reservoir description,this paper carried out development effect evaluation and remaining oil distribution research,and put forward reasonable comprehensive control countermeasures for stabilizing oil and controlling water.Through fine division and correlation of Sha 14-sha 30 fault blocks reservoirs,the isochronous correlation framework of small layers is established;the corresponding microfacies model is established,and the shape and distribution characteristics of sand bodies in the target area are obtained.At the same time,through the combination of multidisciplinary basic knowledge and science and technology,the fault,structure,sedimentary facies and attribute model of Sha 14-sha 30 fault blocks are established,which provides a reliable model for the study of regional reservoir numerical simulation.Then,through the evaluation and analysis of the development effect of water drive in the target block,the existing problems are found out.Combined with the research results of numerical simulation of remaining oil,the corresponding countermeasures are put forward.Under the guidance of the development effect evaluation and the research results of the remaining oil distribution law,based on the existing wells,the measures such as improving the local injection production well pattern and dynamic water injection in layers are proposed to improve the water drive production degree and sweep volume of water drive in the study area.After adjustment,the annual increase of oil production in Sha 14 fault block is 1407 T,the water cut is reduced by 13.4%,and the oil recovery rate is increased by 0.24%;the oil production rate is increased by 0.33% and the water cut is decreased by 12.5% with the annual oil increase of 1550 t in Sha 30 fault block,and the oil recovery efficiency of both blocks is improved.