曲流河型砂体流动单元划分方法  

CLASSIFYING METHOD OF FLOW UNITS IN MEANDERING RIVER SANDBODIES

作　　者：兰丽凤[1,2] 白振强[2] 杨志会[2] 于德水[2] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2010年第3期59-63,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司重点科技项目（060415）“特高含水期水驱厚油层描述与挖潜新技术应用基础研究”部分成果.

摘　　要：油田进入高含水期后，曲流河型河道砂岩为主的储层层内非均质性造成储层内依然存在一定未动用或含油饱和度较高的部位，因此引入流动单元的分析方法精细研究曲流河型砂体内部非均质性。首先进行储层内部构型分析，按照不同级次沉积界面和构型单元的特征分析界面间沉积屏障遮挡状况，建立精细的砂体层内构型分布模型。曲流河砂体划分为3个流动单元级别，Ⅰ类储层流动单元K≥1200×10^-3μm^2，储层质量最好，主要分布于河道、点坝微相中；Ⅱ类储层流动单元400×10^-3μm^2≤K〈1200×10^-3μm^2，水洗程度一般在弱-中水洗级别，为剩余油相对富集的部位；Ⅲ类储层流动单元K〈400×10^-3μm^2，以中低孔、低渗透率为主要特征，分布于废弃河道及溢岸砂微相中。进而对沉积微相层次的流动单元分布和点坝砂体内部流动单元进行了精确表征，为曲流河砂体层内剩余油的挖潜及大孔道的治理提供了一个有效的描述方法。There is still remaining oil in the reservoir of meandering river channel sandbodies because of interlayer heterogeneity as Daqing Placanticline Oilfield enters into high water-cut stage. So the analytical method of flow units is introduced for fine reservoir description of reservoir heterogeneity. First, internal structure of reservoir is analyzed, interfacial sedimentary barriers are studied according to different levels of depositional interface and characteristics of architecture units, and a fine model of interlayer configuration is built. Meandering sandbodies can be divided into three flow units： Flow unit Ⅰ has the best reservoir quality with K ≥ 1200×10^-3μm^2 majorly distributed in river and point bar microfacies. Flow unit Ⅱ has permeability of 400 ×10^-3μm^2≤K 〈 1200×10^-3μm^2 of relative enrichment of remaining oil, with weak-medium water flushing. Flow unit Ⅲ has medium porosity and low permeability of K 〈400 ×10^-3μm^2 mainly distributed in abandoned channel and overbank sand. Distribution of flow units in microfacies level and in point par sandbodies are finely determined, providing an effect description method for development of remaining oil in meandering sandbodies and the profile control of high permeability chan- nels.

关 键 词：曲流河砂体 沉积界面 流动单元 影响因素 

分 类 号：TE319[石油与天然气工程—油气田开发工程]