埕岛油田流动单元定量划分与评价

 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。

Quantitative Classification and Evaluation of the Flow Unit in Chengdao Oilfield

The flowing unit is very important in the study of reservoir heterogeneity and the remaining oil distribution. In the current research methods for flow units, the seepage barrier distribution between the flow units is not well accounted for, too much emphasis is paid on the flow units in the vertical stratification, and the evaluation parameters are not adequate. To solve these problems, this paper considers the upper part of Guantao group strata of 12 and 20 well zones in Southern District of Chengdao oilfield. Combining logging, geological, and development data and other information, several parameters that would reflect the seepage features of the reservoirs are selected such as porosity, permeability, median grain size, clay content, sand body thickness, net/gross ratio, in an analytical hierarchy process, based on the analysis of sedimentary facies and the identification of seepage barriers, the flow units are studied by the cluster and discrimination method. The flow units in this area are divided into four kinds: E, G, M and P, and the formulas for these four kinds of flow units are derived. Compared with the production data, it is found that the distribution of major reservoirs and E-type flow units are in good agreement, showing that the study of flow units can provide a feasible means for the analysis of the heterogeneity and the distribution of remaining oil.