构造变形对烟煤级构造煤微孔-中孔的作用_中国煤炭行业知识服务平台

构造变形对烟煤级构造煤微孔-中孔的作用

Title

Effects of tectonic deformation on micropore-mesopore of bituminous deformed coal
作者

郭德勇郭晓洁李德全
Author

GUO Deyong1 ,GUO Xiaojie1 ,LI Dequan1,2
单位

中国矿业大学（北京）资源与安全工程学院义马煤业集团股份有限公司
Organization

1. Institute of Resources & Safety Engineering,China University of Mining & Technology ( Beijing),Beijing　 100083,China; 2. Yima Coal Industry Group Co. ,Ltd. ,Yima　 472300,China
摘要

煤作为一种复杂的天然多孔性固体物质，其纳米级孔隙对煤层气的储集和运移有着重大影响。我国受成煤盆地多期次构造运动影响，煤层普遍发育不同破坏类型的构造煤，构造煤纳米级孔隙结构在构造变形作用下发生重要变化，这一变化不仅影响着煤层瓦斯的储集和赋存状态，同时也对煤与瓦斯突出预测和煤层气开采具有重要意义。采集首山一矿和义安矿不同变形程度构造煤样品，基于低温液氮吸附(2~50 nm)和二氧化碳吸附(＜2nm)实验，利用多重分形理论分析了构造变形对煤的微孔-中孔结构的影响。结果表明煤样微孔和中孔均具有多重分形特征，微孔广义分形维数谱宽D_10-~D₁₀₊和奇异指数α₀随变形程度的增加整体递增，中孔则先降低后增加。弱变形阶段，微孔信息维数D₁和赫斯特指数H逐渐降低而多重分形奇异谱谱宽Δα逐渐增加，中孔D₁和H逐渐增加而Δα逐渐降低。强变形阶段，微孔D₁,H和Δα均没有发生明显变化，中孔D₁和H明显降低,Δα明显增加。分析构造煤孔隙特征与煤体破坏强度的关系，弱变形阶段，构造变形作用导致煤的微孔结构趋于复杂，孔隙连通性较差，中孔结构趋于简单，归因于官能团脱落以及应力作用下部分中孔结构的收缩。强变形阶段，微孔结构差异依然较强，中孔结构差异则由弱变强，这与强构造应力作用下形成大量的分子间孔、缺陷以及气孔有关。
Abstract

Coal is a complex natural porous solid substance and its nano-scale pore has a significant impact on the stor- age and migration of coalbed methane. Influenced by multi-stage tectonic movements in coal-forming basins in China, different types of deformed coal are widely developed in coal seams,and the nano-pore structure changes greatly under the action of tectonic deformation. This change not only affects the state of gas reservoir and occurrence in coal seams, but also has a significant impact on coal and gas outburst prediction and coalbed methane extraction. Samples of de- formed coal with different deformation degrees in Shoushan No. 1 and Yi’an Mines were collected. Based on the exper- iments of low temperature liquid nitrogen adsorption (2-50 nm) and carbon dioxide adsorption (
关键词

构造煤构造变形微孔-中孔多重分形
KeyWords

deformed coal;tectonic deformation;micropore-mesopore;multifractal
基金项目(Foundation)

国家自然科学基金重点资助项目(41430640);国家自然科学基金—河南联合基金重点资助项目(U1704242)
DOI

10. 13225 / j. cnki. jccs. 2019. 0304
Citation

GUO Deyong,GUO Xiaojie,LI Dequan. Effects of tectonic deformation on micropore-mesopore of bituminous deformed coal[J]. Journal of China Coal Society,2019,44(10):3135-3144.
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