微观剩余油研究现状分析

Analysis of research present situation of microscopic remaining oil

微观剩余油形成机理、赋存量以及空间分布是油田评价储层不同开发阶段含油性、提高采收率的重要研究内容,由于微观剩余油尺寸较小,影响因素复杂,需要借助特殊的方法进行研究.本文从微观剩余油研究的手段入手,将微观剩余油研究分为物理实验技术和数值模拟方法,并探讨了各种方法的优缺点.物理实验技术主要包括传统光学技术、扫描电镜技术、激光共聚焦技术、CT技术、核磁共振成像技术;数值模拟方法主要包括基于网格化方法、无网格化方法、孔隙网络方法等.结合国内外研究现状的综合评述,对两类微观剩余油方法进行展望,指出微观剩余油研究对探勘和开发的重要性,认为CT技术、核磁共振成像技术、格子玻尔兹曼方法和孔隙网络方法是未来微观剩余油研究的主要手段.

Formation mechanism, volume and spatial distribution of microscopic remaining oil are important research contents for the oilfield reservoir evaluation in different development stages and enhanced oil recovery. Because of the small size of microscopic remaining oil and complicated influence factors, special methods should be used to perform research. In this paper, we start from the methods of microscopic remaining oil research, and divide this paper into two parts, physical experimental techniques and the numerical simulation methods. Advantages and disadvantages of each method are discussed. Physical experimental techniques mainly include traditional optical technique, scanning electron microscopy, confocal laser scanning microscopy, CT and nuclear magnetic resonance imaging. Numerical simulation methods mainly include grid-based methods, meshless methods, pore network modelling and so on. Combined with a comprehensive review on literatures, we discuss two kinds of microscopic remaining oil and point out the importance of microscopic remaining oil to exploration and development. CT technology, nuclear magnetic resonance imaging, Lattice Boltzmann method and pore network modelling will be the important means of future research.