高含水期油藏剩余油聚集度表征方法  

A New Method for Characterizing Remaining Oil in High Water⁃Cut Reservoirs

作　　者：赵晨云[1] 窦松江[2] 窦煜 柳朝阳[1] 黄博[1] 王振宇 李刚[1] ZHAO Chenyun;DOU Songjiang;DOU Yu;LIU Chaoyang;HUANG Bo;WANG Zhenyu;LI Gang(Research Center of Exploration and Development Technology,Yanchang Oilfield Co.,Ltd.,Yan’an,Shaanxi 716001,China;Research Institute of Exploration and Development,Dagang Oilfield Company,PetroChina,Tianjin 300280,China)

机构地区：[1]延长油田股份有限公司勘探开发技术研究中心,陕西延安716001 [2]中国石油大港油田分公司勘探开发研究院,天津300280

出　　处：《新疆石油地质》2023年第6期690-695,共6页Xinjiang Petroleum Geology

基　　金：中国石油科技重大专项(2018E-11-06)。

摘　　要：剩余油聚集度是评价高含水期油藏开发效果及开发潜力的重要指标。通过剩余油储量丰度,确定油藏优势储量区;利用单块面积、分布密度和形状指数,通过熵权法确定各指标的权重,最终形成剩余油聚集度的表征。研究表明,对于一个稳定开发的油藏,开发过程中剩余油的离散与聚集可分为一次离散阶段、迅速分离阶段、波动聚集与离散阶段和二次离散阶段。利用表征指标对大港油田港东开发区二区七断块Nm3-4-1小层进行评价,该小层剩余油聚集度随着开发的进行稳步下降,现阶段由于注采结构和井网调整,剩余油聚集度开始上升。Remaining oil aggregation is a key indicator for evaluating the recovery effect and potential of high water‑cut reservoirs.In this study,the dominant reserves zones within the reservoir are determined based on remaining reserves abundance.The weights of indicators are determined with the entropy weight method by using block area,distribution density and shape index.Finally,the remaining oil aggregation is characterized.The results show that,for a reservoir under steady development,the dispersion and accumulation of remaining oil can be divided into four stages:primary dispersion,rapid separation,fluctuating accumulation and dispersion,and secondary dispersion.Utilizing these characterization indicators,an evaluation was conducted on the Nm3‑4‑1 layer in No.7 fault block in Block 2 of the East Dagang Development Area,Dagang oilfield.The results show that the remaining oil aggregation in Nm3‑4‑1 decreased steadily with the progress of development,and it starts to rise owing to injection‑production structure and well pattern adjustments.

关 键 词：高含水期 熵权法 剩余油聚集度 剩余油团块属性 形状指数 注采井网 分布密度 采收率 

分 类 号：TE345[石油与天然气工程—油气田开发工程]