煤体结构对煤层气吸附–解吸及产出特征的影响  

The influence of coal body structure on adsorption–desorption and releasing characteristics of coalbed methane

作　　者：张小东[1,2] 李朋朋[1] 衡帅[1] 孙庆宇[1] 胡修凤 ZHANG Xiaodong;LI Pengpeng;HENG Shuai;SUN Qingyu;HU Xiufeng(School of Energe Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;Collaborative Innovation Center of Coalbed Methane (Shale Gas) in Central Plains Economic Zone, Jiaozuo 454000, China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]中原经济区煤层气(页岩气)协同创新中心,河南焦作454000

出　　处：《煤田地质与勘探》2016年第4期40-45,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41372162);河南省高校科技创新团队支持计划(14IRTSTHN002)~~

摘　　要：煤的孔隙、物理化学结构差异对煤层气的吸附–解吸及产出特征有巨大影响。基于对不同煤体结构煤的孔隙、结构、力学性质的认识，利用现场实测资料，分析了煤体结构对煤层气产出的影响。结果表明：构造变形使煤的孔容和比表面积增大，吸附能力增强。含气量和损失量呈正相关关系；在含气量相同的情况下，逸散速率相对大小依次为：原生结构煤<碎裂煤<碎粒煤<糜棱煤。原生结构煤和碎裂煤的临界解吸压力大于糜棱煤。在0~45 min、45~95 min、95~185 min，平均解吸速率关系为：原生结构煤<碎裂煤<糜棱煤，而在185~485 min 内，平均解吸速率关系反生改变，即：糜棱煤<原生结构煤<碎裂煤。在含气量大致相等时，原生结构煤和碎裂煤的解吸量及解吸时间明显大于糜棱煤。The differences of pore and physical-chemical structure of coal body have great effect on adsorption-desorption and releasing characteristics of coalbed methane. Based on understanding of pores, structures andmechanical properties of different coal body structures, the paper analysed coal body structure influencing the releasingof coalbed methane with field measured data. Results show that tectonism makes pore volume and specific surfacearea of coal body increase, and adsorption capacity enhanced. Gas content and lost gas present positive correlation;relations of rate of lost gas of different coal body structures were: primitive texture coal < reptured coal < fragmentedcoal<mylonitic coal with the same gas content. Critical desorption pressures of primitive texture coal and repturedcoal are more than mylonitic coal’s. In 0~45 min、45~95 min、95~185 min, relations of average desorption rate ofdifferent coal body structures were: primitive texture coal<reptured coal<mylonitic coal; in 185~485min, their relationschange, showing mylonitic coal<primitive texture coal<reptured coal. Desorption quantity and desorption timeof primitive texture coal and reptured coal are obviously hingher than mylonitic coal’s on condition of almost the samegas content.

关 键 词：吸附–解吸 产出特征 赋存状态 临界解吸压力 煤体结构 

分 类 号：P618.11[天文地球—矿床学]