Heterogeneity Of Low Permeability Reservoir In Huanbei Dujiatai

Huanbei Dujiatai oilfield is a extra low permeability reservoir,and it has entered the high water stage after a long time of water injection development.Affect by the reservoir heterogeneity and other geological factors,the producing reserves in vertical is quite different.Most of the high permeability reservoir is water flooding, the law of the remaining oil distribution is affected by the heterogeneity of reservoir.So,This paper studied the reservoir heterogeneity of Dujiatai reservoir and reveal how does the remaining oil distribution control the oil and water migration, and find out remaining oil enriched area under the influence of different heterogeneous modes,to provide a basis for the later study of Huanbei Dujiatai reservoir remaining oil tapping.In this paper, we mainly study the heterogeneity of reservoir and its basic properties, and a detailed description of the research process. First direction from the sedimentary area of has carried on the detailed description of Dujiatai area sedimentary micro facies and their characteristics, and the deposition process of diagenesis launched some analysis and discussion. Combined with the structure of work area evolution history can believe that the low permeability reservoir heterogeneity of the main influencing factors are sedimentary environment, diagenesis and tectonism in three aspects. A quantitative analysis of the heterogeneity of reservoir from the inner layer, interlayer and plane, micro four angles, summed up the study area of low permeability reservoir heterogeneity model of 3 kinds of 4 types of pore structure and distribution of facies belt. On the basis of reservoir heterogeneity research results and production dynamic data analysis, control effect on reservoir heterogeneity on residual oil distribution are analyzed, that the plane on the residual oil is mainly distributed in the channel sand body edge and injection production well pattern is not perfect area and different facies belt splice site; in the longitudinal direction, the residual oil mainly exists in relatively poor physical property, the inhomogeneous part. The research results to improve the Dujiatai reservoir oil and gas recovery rate has important guiding significance.