基于辫状河储层构型的流动单元划分及其分布规律  

Flow units division and their distribution law based on braided river reservoir architecture

作　　者：王石[1] 万琼华[2,3] 陈玉琨[2] 李学伟 梁杰 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中海石油(中国)有限公司深圳分公司,广东广州518067 [4]中国石油大港油田分公司第六采油厂,天津300280

出　　处：《油气地质与采收率》2015年第5期47-51,68,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"复杂储层构型精细表征与建模"(2011ZX05009-003)

摘　　要：随着对辫状河储层构型研究的深入,储层构型控制下的流动单元分布规律成为研究的重点问题。以大港油区A油田馆陶组辫状河储层为例,在辫状河储层构型分析的基础上,研究了辫状河流动单元的划分方法及其分布规律。首先在渗流屏障的识别、连通体划分和连通体内渗流差异分析的基础上,结合研究区储层非均质特征,优选了泥质含量、孔隙度、流动带指数和流度4个判别参数,应用聚类分析的方法,将储层划分为最好(Ⅰ类)、较好(Ⅱ类)、中等(Ⅲ类)、较差(Ⅳ类)和最差(Ⅴ类)5类流动单元;然后根据流动单元的判别标准,进行单井流动单元划分,并在此基础上,运用流动单元剖面和平面互动分析的方法,研究了流动单元的平面和剖面分布规律。结果表明:平面上,优质流动单元主要分布在心滩核部、砂质充填河道等砂体主体部位;垂向上,河道底部的流动单元优于河道顶部,在心滩内部夹层上、下流动单元类型会发生变化。Following the study of braided river reservoir architecture,the flow unit distribution controlled by reservoir architecture becomes more and more important. Taking the braided river reservoir in the Guantao Formation in Dagang A Oilfield for example,the thesis focuses on the method of classifying braided river flow units and their distribution law based on reservoir architecture analysis. Firstly,based on the seepage barrier identification,the connected volume division and seepage variation analysis,as well as considering the reservoir heterogeneity,four parameters including shale index,porosity,FZI(flow zone index)and K/μ were selected to divide the reservoirs into five types ofⅠ,Ⅱ,Ⅲ,ⅣandⅤby using the method of cluster analysis. Secondly,every single well was interpreted and the type of flow unit was identified according to the standard. And the distribution both in plane and on section was studied under the guidance of reservoir architecture and flow unit model using interactive analysis between horizontal and sectional characteristics of flow unit. The results can be concluded as follows:1Horizontally,the core part of channel bar and sand-filling river course are generally served as the well reservoir flow unit. 2Vertically,the flow units in the bottom are generally better reservoirs than those in the upper part,and the type of flow units above and below the interlayers inside of the channel bar does not always remain the same.

关 键 词：辫状河 流动单元 聚类分析 渗流屏障 连通体 

分 类 号：TE112.221[石油与天然气工程—油气勘探]