基于分子动力学模拟的深部储层原油赋存特征研究

随着石油勘探工作的不断推进，深层油气已经成为我国陆上油气勘探突破发现与规模增储的重要领域。明确深部储层原油赋存特征对于油藏储量评估和开发方案优化具有重要的现实意义。依据深部储层岩石的结构特征，原油存在三种赋存状态：大尺度缝洞中的体相游离原油、缝隙岩石表面的吸附原油和岩石微孔隙中的赋存原油。目前，由于深部储层高温高压的特点，实验上开展深层原油赋存的研究存在诸多困难。鉴于此，本课题采集塔里木盆地顺北-跃进地区的深层岩心和油样，基于深部储层岩石结构表征和原油组分分析的实验结果，构建储层岩石/原油赋存分子模拟体系；采用分子动力学模拟方法，系统考察体相游离原油、岩石表面吸附原油和微孔隙内原油的赋存特征；明确温度、压力和气油比等因素对原油赋存的影响规律。本课题的开展可为深层油气赋存特征研究提供新的思路和方法，研究工作将为深层油气的勘探开发提供基础数据和理论依据。

With the development of petroleum exploration, deep oil & gas have become important area for oil & gas exploitation discovering and scale increase storage in china. Clarifying the occurrence characteristics of oil & gas in deep reservoirs has great practical significance for the evaluation of deep reservoir reserves and optimization of exploration program. According to the structural characteristics of deep reservoir rocks, crude oil has mainly three status: bulk free crude oil inside large fractured cavity, crude oil adsorbed on the rock surface and crude oil inside micropore of rock. Currently, due to the high temperature and high pressure of deep reservoir, studies on the occurrence characteristics of deep oil & gas via experimental means exists many difficulties. Therefore, in this project, collecting the rock cores and oil samples of deep reservoir located at Shunbei-Yuejin area in Tarim basin, based on the characterization of these rock cores structure and analysis of crude oil components, the corresponding simulation systems of reservoir rock and crude oil will be constructed. Adopting molecular dynamics simulations, the occurrence characteristics of bulk crude oil, crude oil adsorbed on rock surface and crude oil inside rock micropore will be studied systematically, and the influencing rule of temperature, pressure and gas oil ratio on the occurrence characteristics of crude oil will also be investigated. This project provides a new idea and method for studying the occurrence characteristics of oil & gas in deep reservoirs, and the results will provide basic data and theoretical reference for the exploitation and exploration of deep oil & gas resources.