浅水三角洲储层流动单元划分  

Classification of flow units in shallow water delta reservoir

作　　者：吴穹螈 王少鹏 张岚 翟上奇 常会江 WU Qiongyuan;WANG Shaopeng;ZHANG Lan;ZHAI Shangqi;CHANG Huijiang(Tianjin Branch,CNOOC Limited(China),Tianjin 300452)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《长江大学学报（自然科学版）》2023年第2期84-95,共12页Journal of Yangtze University(Natural Science Edition)

基　　金：国家重大科技专项“渤海油田加密调整及提高采收率油藏工程技术示范”(2016ZX05058001)。

摘　　要：为准确反映储层内部非均质性,以指导油田后期开发调整,有必要对砂体开展流动单元研究。综合应用测井、地震、分析化验和动态资料,采用熵权Topsis法对渤海B油田开展浅水三角洲储层流动单元划分。研究表明,研究区浅水三角洲储层非均质性较强,孔隙度、渗透率、泥质含量和饱和度中值压力是影响储层储集渗流能力的主要因素,根据以上4类参数可将储层划分为Ⅰ、Ⅱ、Ⅲ、Ⅳ四类流动单元。流动单元的分布受到沉积相的控制,Ⅰ、Ⅱ类流动单元主要分布在分流河道和分流砂坝中,连通性较好;Ⅲ、Ⅳ类流动单元主要分布在分流河道边部和溢岸砂中,连通性较差。流动单元的组合样式对连通性具有明显控制作用,不同流动单元间形成渗流差异界面,使得砂体内部弱连通或不连通,导致剩余油大量富集。In order to accurately reveal the internal heterogeneity of reservoirs and guide the later development and adjustment of oilfields,it is necessary to carry out the research on the flow units of sand body.Based on the comprehensive application of logging,seismic,analytical test and dynamic data,the entropy weight Topsis method was used to classify the flow units of shallow water delta reservoir in Bohai Oilfield B.The study shows that the shallow water delta reservoir in the study area has strong heterogeneity,and porosity,permeability,shale content and saturation median pressure are the main factors affecting the reservoir seepage capacity.According to the above four parameters,the reservoir can be divided into four types of flow units:Ⅰ,Ⅱ,ⅢandⅣ.The distribution of flow units is controlled by sedimentary facies;type Ⅰ andⅡflow units are mainly distributed in distributary channels and distributary sand bars,with good connectivity,while typeⅢandⅣflow units are mainly distributed in the edge of distributary channels and overbank sand,with poor connectivity.The combination pattern of flow units has a significant control on connectivity,and different flow units form seepage differential interfaces,which makes the sand body weakly connected or disconnected,resulting in a large amount of remaining oil enrichment.

关 键 词：浅水三角洲 流动单元 熵权 TOPSIS法 剩余油 

分 类 号：TE321[石油与天然气工程—油气田开发工程] TE122.2