基于灰色定权聚类的微观水驱油模型实验特低渗透储层流动单元划分及评价  

Division and Evaluation of Flow Units by Means of Sandstone Micro-model for Water-Oil Displacement Experiment Based on Grey Fixed Weight Clustering Method

作　　者：黄进腊[1,2] 孙卫[1,2] 

机构地区：[1]西北大学大陆动力学国家重点实验室,西安710069 [2]西北大学地质学系,西安710069

出　　处：《地质科技情报》2011年第3期77-82,共6页Geological Science and Technology Information

基　　金："十一五"国家科技支撑计划(2007BAB17B02);国家"973"项目(2003CB214606)

摘　　要：为研究微观水驱油模型流动单元划分及评价的可行性和效果,应用灰色定权聚类方法,以吴起油田X井区特低渗透长63储层25块样品为例,采用真实砂岩微观水驱油模型实验,以测得的渗透率、水驱前含油饱和度、启动压力、1 PV驱油效率以及孔隙度5项参数为基础,将样品划分为Ⅰ类、Ⅱ类和Ⅲ类流动单元。Ⅰ类、Ⅱ类和Ⅲ类流动单元分别与水下分流河道、河口坝、远砂坝微相类型相吻合。结合实验动态观察和数据分析,不同类型的流动单元有着不同的渗流通道、驱替方式、孔喉特征、驱油效率以及压力增加对驱油效率的敏感程度。灰色定权聚类方法具有较好的综合判别能力,为流动单元的划分及评价提供了一条新的思路。To research the feasibility and effect of the division and evaluation of flow units made by applying micro-model for water-oil displacement,twenty five samples from the Chang-63 reservoir with ultra-low permeability in well block X of Wuqi Oilfield in Ordos Basin were tested by means of real-sandstone micro-model for water-oil displacement experiment for the collection of the parameters of their permeability,oil saturation before displacement,starting pressure,displacement efficiency of 1PV together with porosity.Based on these parameters,the samples can be divided into three categories of flow units as Ⅰ,Ⅱ and Ⅲ according to the grey fixed weight clustering method.The results show that the flow units consist of type Ⅰ,Ⅱ and Ⅲ distributed in sedimentary microfacies of subaqueous distributary channel,mouth bar and distal bar,respectively.By integrating experimental dynamic observation and data analysis,a conclusion is drawn that different flow units bear different pore throat characteristics,flow path,displacement model and displacement efficiency caused by the pressure.Hence the grey fixed weight clustering method offers a brand new way for the division and evaluation of flow units due to its highly comprehensively distinguishing ability.

关 键 词：灰色系统 灰色聚类方法 砂岩微观水驱油模型实验 流动单元 驱油效率 孔喉特征 

分 类 号：P618.13[天文地球—矿床学]