岩石润湿性核磁共振表征技术的研究进展  

Review on nuclear magnetic resonance characterization for rock wettability

作　　者：梁灿 贾子健 肖立志[3] LIANG Can;JIA ZiJian;XIAO LiZhi(Changzhou Institute of Technology,Changzhou 213032,China;University of Shanghai for Science and Technology,Shanghai 200093,China;National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China)

机构地区：[1]常州工学院,常州213032 [2]上海理工大学,上海200093 [3]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249

出　　处：《地球物理学进展》2023年第4期1610-1624,共15页Progress in Geophysics

基　　金：国家自然科学基金(42004105);江苏省高校自然科学基金面上项目(20KJD430002);常州工学院高层次人才启动项目(YN20025)联合资助。

摘　　要：随着油湿储层、混合润湿储层等复杂润湿性储层的大量发现,润湿性对岩石物理响应的影响越来越引起人们的关注,识别和表征岩石润湿性正成为储层评价必须解决的难题之一.核磁共振技术作为兼具实验室和井下探测的重要手段,逐渐发展为一项有效的岩石润湿性探测技术,它测量的弛豫时间(T1和T2)、扩散系数D、内部磁场梯度G等信息,为岩石润湿性表征方法的建立提供了不同的解决途径.系统梳理核磁共振方法表征岩石润湿性的理论基础和方法原理,对理解这一前沿技术的来龙去脉非常重要.本文首先从界面作用力和视接触角两方面,阐明核磁共振表征润湿性的理论基础;然后,通过广泛的文献调研,系统介绍近70年来核磁共振表征岩石润湿性的6类方法,并对这些方法的优点和局限性进行对比.最后,分析矿物成分、流体性质及储层条件这3个因素对应用核磁共振开展储层润湿性原位表征的影响.分析表明,基于一维T2弛豫时间的核磁共振润湿性指数已经具备用于岩石物理实验和测井评价的条件,但还没有一种通用的核磁共振方法能完全解决各类储层润湿性的定量评价问题;基于(T1-T2)和(T2-D)等二维核磁共振技术的综合分析具有解决非常规储层润湿性表征的潜力.总的来说,利用核磁共振表征储层润湿性,需要在明确储层岩性特征的基础上,合理优选核磁共振方法.本文的结论希望能够为应用核磁共振开展岩石润湿性表征的实验观测及测井评价提供一个指南和参考.As oil-wet or mixed-wet reservoirs are more frequently discovered,there is a growing attention in the influence of wettability on petrophysical responses.One of the challenges that must be overcome for reservoir evaluation is the identification and characterization of rock wettability.Nuclear Magnetic Resonance(NMR),used as a crucial tool in both laboratory and downhole,has gradually developed into a reliable technique for detecting rock wettability.Various solutions for wettability determination are offered by the measured parameters including relaxation time(T1 or T2),diffusion coefficient(D),and internal magnetic field gradient(G).To understand the intricacies of this cutting-edge technology,a systematic review of the theoretical foundation and methodologies for characterizing rock wettability using NMR methods is required.The theoretical link between NMR techniques and wettability in terms of both interfacial forces and apparent contact angles was firstly clarified in this paper.Following a thorough literature research,the six types of long-established and recently developed approaches for predicting rock wettability over the past 70 years were systematically introduced.Their advantages and disadvantages were compared.Finally,three potential factors,including mineralogical compositions,fluid properties,and reservoir conditions,influencing NMR application for in-situ wettability characterization were analyzed.The study demonstrates that various NMR T2-based wettability indices are available for wettability assessment used in both petrophysical experiments and logging evaluation.However,there is no universal NMR method that can solve the quantitative estimates of wettability of various reservoirs completely.The comprehensive two-dimensional NMR analysis,such as T1-T2 and T2-D correlations,has the potential to characterize wettability in unconventional formations.In general,the key to accurately quantifying reservoir wettability using NMR is the rational selection of NMR methods based on a thorough understanding

关 键 词：岩石润湿性 核磁共振 表面弛豫 核磁共振润湿指数 二维核磁共振方法 

分 类 号：P631[天文地球—地质矿产勘探]