煤体结构差异的孔隙响应及其控制机理  

Pores response of structural difference of coal body and its influence mechanism

作　　者：张小东[1,2] 苗书雷[1] 王勃[3,4] 柴松峰[1] 

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]煤炭资源与安全开采国家重点实验室(中国矿业大学),北京100083 [3]中国矿业大学资源与地球科学学院,江苏徐州221008 [4]中国石油勘探研究院廊坊分院,河北廊坊065007

出　　处：《河南理工大学学报（自然科学版）》2013年第2期125-130,共6页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41072113);中国矿业大学煤炭资源与安全开采国家重点实验室开放基金资助项目(SKLCRSM10KFB01)

摘　　要：为了研究不同煤体结构煤的孔隙差异及作用机理,以焦作、济源、鹤壁、大峪沟、平顶山等矿区采取的煤样为研究对象,并通过压汞法、低温液氮法和扫描电镜(SEM)对煤体破坏汽后煤的孔隙性进行了测试.结果表明,煤体破坏不仅使得煤的变质程度增加,煤体强度降低,而且还使得尺度较大的粒间孔含量增加,并且新形成的粒间孔很少被矿物质充填,同时也破坏了孔隙的定向性和完整性;相比于原生结构煤,煤体破坏后煤中的微米、纳米级孔隙含量显著增大,煤的孔隙形态和连通性发生改变;另外,煤体破坏对煤孔径的大小、不同孔径段孔隙的分布、流体在煤体内的运移都有影响.In order to study on the difference and its controlling mechanism of pores in coal with different coal body structures, the coal samples with different teehtonic deformation from some coal mines in Jiaozuo, Jiyuan, Hebi, Dayugou and Pingdingshan coalfield of Henan province were taken as investigation objects, and by means of relative measurement, including mercury injection porosimetry（MIP）, low temperature nitrogen adsorption instrument and scanning electronic microscopy （SEM） , the pore shapes and the pore structure pa- pameters were observed and tested. The results show that the deformed coals not only make their metamorphic degree deepen and their mechanical property declined, but also make the content of intergranular pores formed, the content of pores with larger pore diameters enlarged, a few new formed intergranular pores filled by minerals, and further, the directionality and the completeness of coal pores broken. Compared with primary structure coal, the content of micro and nano pores are conspicuously augment after the coal body broken, and the connectedness and shapes of coal pores have changed. Besides, the broken coal body has an impact on the size of coal aperture, the distribution of different aperture pores and migration of fluid in the coal.

关 键 词：煤体破坏 原生结构煤 孔隙 差异 

分 类 号：P618.11[天文地球—矿床学]