塔里木盆地东河砂岩油藏渗流屏障的渗流特征机理研究

Study on Characteristics and Mechanism of Seepage Barrier in Donghe Sandstone Oilfiled, Tarim Basin

摘要: 储层的渗流屏障研究，是揭示油藏非均质性的不可缺少的组成部分。隔夹层能够将油层分隔成多个连通或者不连通的流动单元，在不同程度上控制着油水的运动。根据取心资料观察夹层的岩性，研究对应的电性及物性特征，目标区油藏的夹层分为钙质、泥质、钙泥质3类。渗流屏障对油藏注水注气开发影响很大，尤其对流体运移和剩余油分布有明显的控制作用。开发后期剩余油分布更加复杂，渗流屏障研究成果对油藏开发调整的指导意义更为重要。由于东河砂岩油藏隔夹层发育，整体上底水能量充足，因此研究渗流屏障机理对认识油藏水侵危害及为后续开发过程中治水对策的制定提供重要的理论支撑。本文章主要利用数值模拟软件并通过机理模拟，开展不同类型隔夹层对注水、注气等开发效果的影响分析。

Abstract: The study of reservoir seepage barrier is an indispensable part of revealing the heterogeneous of reservoir. The reservoir can be separate into several connected or disconnected flow units by interbed, which can control the movement of oil and water at varying degrees. According to cor-ing data and observing lithology of interbed, the corresponding electrical and physical properties are studied. The interbeds of reservoir in target area are divided into three types: calcareous, ar-gillaceous, calcareous argillaceous. Seepage barrier has great influence on water injection and gas injection development of the reservoir, especially on the control of fluid migration and remaining oil distribution. The distribution of remaining oil is more complex in the later stage of development, and the research results of seepage barrier are more important to guide the development and adjustment of the reservoir. Because of the development of interbed in Donghe sandstone oilfiled and abundant energy of bottom water on the whole, the study of seepage barrier mechanism provides important theoretical support for understanding reservoir water invasion hazards and formulating water control countermeasures in the follow-up development process. In this paper, numerical simulation software and mechanism simulation are used to analyze the influence of dif-ferent types of interlayer on water injection, gas injection and other development effects.