页岩非均质性和微-纳米孔喉结构对含气性的控制机理

项目名称： 页岩非均质性和微-纳米孔喉结构对含气性的控制机理

项目编号： No.41472112

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 姜振学

作者单位： 中国石油大学（北京）

项目金额： 120万元

中文摘要： 页岩气的赋存状态和含气量是资源潜力评价、有利目标优选的关键因素。页岩的非均质性和微-纳米孔喉结构对页岩气的赋存状态和含气量有重要影响，但它们之间的相互关系及作用机理尚不清楚。项目以渝东南地区志留系龙马溪组页岩为研究对象，针对页岩非均质性和微-纳米孔喉结构对含气性的控制机理这一科学问题开展研究。通过岩石学和地球化学研究，阐明页岩非均质性特征；采用间接测试和直接观察相结合的方法，定量表征页岩的微-纳米孔喉结构；通过研究页岩微-纳米孔喉结构与页岩有机质和矿物非均质性分布的关系，阐明页岩非均质性对微-纳米孔喉结构的控制作用；通过分子动力学模拟，确定页岩有机质和矿物中不同类型孔喉赋存游离态甲烷的临界孔径，揭示页岩微-纳米孔喉结构对页岩气赋存状态的控制机理，预测页岩含气量。成果对于阐明页岩非均质性和微-纳米孔喉结构对含气性的控制作用，揭示页岩富气机理和评价页岩含气量具有重要理论和现实意义。

中文关键词： 页岩非均质性；微-纳米孔喉结构；含气性；赋存状态；控制机理

英文摘要： Shale gas occurrence and gas content, which are closely related to shale heterogeneity and micro-nano scale pore-throat structure, are consider to be vital factors for shale gas resources evaluation and favorable target area optimization. However, the mechanism of interaction between them remains unclear. In this project, black shale from Silurian Longmaxi Formation in Yudongnan area are studied to discuss the control mechanism of shale heterogeneity and micro-nano scale pore-throat structure on shale gas bearing capacity. Detailed lithology and geochemistry approaches are proposed to determine the characteristics of shale heterogeneity. Indirect measurement and direct observation methods are conducted to characterize the micro-nano scale pore-throat structures hosted by organic matter and minerals, and the correlation of organic matter and mineral distribution with shale heterogeneous as well as the control of shale heterogeneity on micro-nano scale pore-throat structures are discussed. Using molecular dynamics simulation method, the critical pore radii for free gas occurrence in different types of pore throat hosted by organic matter and mineral are simulated. The control mechanism of micro-nano scale pore-throat structures on shale gas occurrence is determined and the shale gas in place is predicted. The expected results of this project are of great significance for control mechanisms of shale heterogeneity on micro-nano scale pore-throat structures on shale gas bearing capacity, shale gas in place evaluation, gas rich shale section prediction and favorable target area optimization.

英文关键词： shale heterogeneity;micro-nano scale pore-throat structure;micro-nano scale pore-throat;shale gas occurrence;control mechanisms