低渗透储层基于岩心仿真模型的微观剩余油研究  

Study of microscopic remaining oil in low permeability reservoir based on core simulation model

作　　者：刘萍[1,2] 张皎生[1,2] 王睿恒[1,2] 李文芳 李舒彤[1,2] LIU Ping;ZHANG Jiaosheng;WANG Ruiheng;LI Wenfang;LI Shutong(Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi'an Shaanxi 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Field,Xi'an Shaanxi 710018,China)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《石油化工应用》2025年第2期28-31,共4页Petrochemical Industry Application

基　　金：中国石油天然气集团有限公司科技专项“低渗/致密油藏改善水驱关键技术研究”(2023ZZ17-01);中国石油长庆油田公司科技项目“特低渗-致密油藏开发中后期渗流场精细表征”(2023DJ0201)。

摘　　要：低渗透储层孔隙结构复杂、非均质性强,在实际开发中原油采收率较低,仍有较多的剩余油滞留在储层内。因此,对低渗透储层开展微观剩余油分布研究,揭示微观孔喉网络中剩余油的分布模式及分布规律,能够为后期提高采收率提供地质依据。本次实验选取真实岩心进行图像分析,并制作成仿真模型,开展不同孔喉模型及黏度下微观剩余油赋存形态研究。结果表明:小孔细喉和中孔中喉模型中剩余油以膜状、角状为主,大孔中喉模型中剩余油以柱状、片状为主;原油黏度对剩余油分布形态的影响主要表现在膜状、簇状两种类型上,黏度越大,簇状剩余油则增多,膜状剩余油则减少。The low permeability reservoir has complex pore structure and strong heterogeneity.In the actual development process of low permeability reservoir,there is a low recovery of crude oil with more remaining oil in the reservoir.The study of microscopic remaining oil distribution in low permeability reservoir reveals the distribution pattern of remaining oil in micro-pore throat network,which can provide geological basis for improving the oil recovery in later stage.In this experiment,the real core is selected for image analysis,and made into a simulation model to carry out different pore throat model and viscosity of micro-remaining oil occurrence state.The results show that the remaining oil in the small pore-fine throat and mesoporous throat model exists in the form of membranous and angular,and in the large pore mesoporous throat model that is columnar and flaky.The effect of crude oil viscosity on the distribution of remaining oil is mainly manifested in two types of remaining oil.The higher the viscosity is,the more the cluster remaining oil is,and the less the pellicular remaining oil is.

关 键 词：仿真模型 孔喉结构 原油黏度 微观剩余油 赋存状态 

分 类 号：TE327[石油与天然气工程—油气田开发工程]