不同变形机制下煤岩纳米级孔隙结构演化过程及其机理

项目名称： 不同变形机制下煤岩纳米级孔隙结构演化过程及其机理

项目编号： No.41202120

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 李小诗

作者单位： 中国科学院大学

项目金额： 25万元

中文摘要： 煤岩纳米级孔隙结构是煤层气尤其是超量煤层气的重要赋存空间，不同变形机制(脆性和韧性变形)纳米级孔隙结构的演化过程对煤层气的赋存状态具有重要的影响。本项目选取两淮地区构造煤为研究对象，通过高分辨透射电镜，原子力显微镜，核磁共振，小角XRD散射，低温液氮，低压二氧化碳及等温吸附解吸等实验对构造煤大分子和纳米级孔隙结构演化特征进行系统的研究，试图分析在脆性变形和韧性变形机制下，不同变质程度(中变质和高变质)的构造煤纳米级孔隙结构的演化过程；系统研究不同变形机制下，煤岩不同孔径纳米级孔隙之间的演化机理；分析不同变形机制纳米级孔隙结构对甲烷吸附解吸的影响，并深入探讨甲烷在纳米级孔隙演化过程中的赋存状态。本项目的研究，不仅在构造变形、煤岩超微结构及超量煤层气的赋存状态方面具有重要的理论意义，而且对构造煤发育区煤与瓦斯突出及煤层气勘探开发方面也具有重要的实际价值。

中文关键词： 构造煤；纳米孔隙结构；分形特征；吸附/解吸；CBM赋存状态

英文摘要： The nanopore structure of coal is the most important reservoir space for Coalbed Methane (CBM), especially for Excess CBM. In different deformational mechanisms (brittle and ductile deformation), the evolutionary process of nanopore structure has a material effect to the occurrence state of CBM. This study chooses the Tectonically Deformed Coal (TDC) of Huainan-Huaibei coal field area as the research samples. We will systematically analyze the evolutional characteristics of macromolecule and nanopore structure of TDC by using modern testing techniques and experiment methods like High-Resolution Transmission Electron Microscope (HRTEM), Atomic Force Microscope (AFM), Nuclear Magnetic Resonance (NMR), Small Angle X-ray Scattering (SAXS), Low-Temperature Nitrogen Adsorption, Low-Pressure CO2 Adsorption and Isothermal Adsorption/Desorption Method etc. This study tries to analyze ① the evolutionary process of nanopore structure of TDC with different metamorphic grade (middle and high metamorphic grade) under brittle and ductile deformational mechanisms; ② the evolutional mechanism among different pore size with different deformational mechanisms; ③ the effect of nanopore structure with different deformational mechanisms to adsorption/desorption of methane. Furthermore, the occurrence state of methane in evolutionary

英文关键词： Deformed coal；Nanopore structure；Fractal characteristic；Adsorption/desorption；Occurrence state of coalbed methane