| 煤储层纳米孔隙结构及其瓦斯扩散特征 |
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| 引用本文： | 聂百胜,伦嘉云,王科迪,申杰升,琚宜文,张军,陆卫东.煤储层纳米孔隙结构及其瓦斯扩散特征[J].地球科学,2018,43(5):1755-1762. |
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| 作者姓名： | 聂百胜 伦嘉云 王科迪 申杰升 琚宜文 张军 陆卫东 |
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| 作者单位： | 1.中国矿业大学共伴生能源精准开采北京市重点实验室, 北京 100083 |
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| 基金项目： | 中央高校基本科研业务费资助项目2009KZ03国家自然科学基金项目51374216中国科学院战略性先导科技专项XDA05030100国家科技重大专项2011ZX05066-003"十三五"国家重点研发专项2016YFC0600708 |
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| 摘 要： | 研究煤复杂发育的孔隙结构对揭示煤层气体赋存机理及扩散运移规律有重要意义.为了研究煤的纳米孔隙结构，利用SEM、液氮吸附、小角X射线研究了不同煤阶煤的纳米孔隙在形式和分布上的非均匀性.实验煤样煤基质中的孔呈多峰分布，且孔径范围主要集中在2~10 nm.煤样低温液氮吸附实验测得煤样的吸附量为3.676 cm3/g，煤样的比表面积为1.416 m2/g.以最可几孔径作为研究对象，在实验压力范围内，吸附压力越大，最可几孔径变大的越多；瓦斯气体在纳米级孔隙结构中的扩散模式以过渡型扩散为主，微孔更发达的煤样中，扩散更接近Knudsen型扩散，中孔更发达的煤样中，扩散更接近Fick型扩散；Knudsen数与温度呈负相关关系，温度高于250 K后，Knudsen数趋于稳定，与压强呈正相关关系，压强越大，扩散越容易.
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| 关 键 词： | 孔隙结构 扩散方式 Knudsen数 小角X射线散射 |
| 收稿时间： | 2017-10-27 |
Characteristics of Nanometer Pore Structure in Coal Reservoir |
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| Abstract: | In order to study the characteristics of nanometer pore structure of coal, the heterogeneous structures of nano pores of different rank coals were investigated by using SEM, liquid nitrogen adsorption and small angle X ray. It is found that the mesopore shows the multimodal division, mainly concentrated in the 2-10 aperture and nm. The adsorption capacity of coal low-temperature nitrogen adsorption experiments of coal samples is 3.676 cm3/g, and coal sample surface area is 1.416 m2/g. By analyzing the most probable aperture, the range of experimental pressure can be found out, and the most probable pore size will be increased with the adsorbent pressure. Gas diffusion model in most nanoscale pore structure model prefers coals mainly concentrated on transitional diffusion. In more developed microporous coal samples (anthracite), the diffusion type is closer to the Knudsen diffusion. In much less developed coal samples, the main diffusion type is closer to Fick diffusion. The Knudsen number is negatively related to temperature, and Knudsen number tends to be stable when the temperature is higher than 250 K, which is positively correlated with the pressure. The diffusion will be easier with the increase of pressure. |
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