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研究流动单元,对认识储层的非均质性,研究剩余油分布特征非常重要。针对流动单元间渗流屏障的分布不够重视、过多地强调了流动单元在垂向上的分层性、评价参数选取不合理等,以埕岛油田主体南区12块、20块馆陶组上段河流相储层为例,综合地质、测井、开发等资料,选取孔隙度、渗透率、粒度中值、泥质含量、砂体厚度、净毛比等反映储层渗流特征的多个评价参数,采用层次分析法,在沉积微相精细研究和渗流屏障识别的基础上,使用聚类和判别等数学方法,将该区开发小层内部的储层划分为极好、好、中等、差4类流动单元。通过与生产资料的对比分析,认为主力油层的分布与极好型流动单元有很好的一致性,表明小层内部的流动单元的研究能够为更准确地认识储层非均质性和剩余油分布规律提供一种可行的途径,对埕岛油田的生产开发部署具有一定的理论和现实意义。
Studying flow units is very important for understanding reservoir heterogeneity and studying remaining oil distribution characteristics. In view of the fact that the distribution of percolation barriers in flow cells is not emphasized enough, the stratification of flow cells in the vertical direction is excessively emphasized and the selection of evaluation parameters is unreasonable. Based on the upper section of Guantao Formation in Jundao Oilfield, This paper chooses a series of evaluation parameters such as porosity, permeability, median grain size, mud content, sand body thickness and net wool ratio to reflect the seepage characteristics of reservoirs by taking geologic, logging and development data as an example. Based on the detailed analysis of sedimentary microfacies and the identification of seepage barrier, the analytic hierarchy process (AHP) is used to classify the reservoirs inside the small reservoirs developed in this area into excellent, good, medium and poor class 4 based on mathematical methods such as clustering and discriminant Flow unit. Through the comparison with the production data, it is considered that the distribution of the main oil layers is in good agreement with the excellent flow units, indicating that the study of the flow units inside the small layers can provide a more accurate understanding of reservoir heterogeneity and remaining oil The distribution law provides a feasible way, which has certain theoretical and practical significance for the production and deployment of Chengdao oilfield.