鹤岗煤田构造煤孔隙分形特征  

Fractal characteristics of tectonic coal from Hegang coal field

作　　者：王有智[1] 王世辉[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《东北石油大学学报》2014年第5期61-66,120,共7页Journal of Northeast Petroleum University

基　　金：国家重大科技专项(2010E-2201)

摘　　要：基于鹤岗煤田北部区块典型构造煤样的低温氮吸附实验数据,分析不同变形程度下构造煤的分形维数与孔隙系统结构和气体吸附能力的关系.结果表明,受变形程度影响,碎裂煤和碎粒煤的孔隙系统发生变化,导致低温氮吸附、解吸曲线表现出不同形态.在相对压力为0.5-1.0时,分形维数可以有效表征碎裂煤与碎粒煤的孔隙结构和吸附能力.随着分形维数变大,煤岩变形程度增加,微孔含量增加,孔径变小,比表面积增大,孔表面粗糙度增加,使得煤岩孔隙系统复杂化,最终煤岩吸附能力增强.因此,煤岩孔隙分形维数可以表征煤岩孔隙结构和吸附能力.Based on representative samples of north area in Hegang coal field that using low temperature nitrogen adsorption method to study the relationship between fractal dimension and pores system and gas adsorption capacity of tectonic coal in different deformation grade.Results show that low temperature nitrogen adsorption and desorption curve display different shape,because of the pores system of cataclastic coal and granulated coal were changed by tectonic.The fractal dimension could characterize pores composition and adsorption capacity of cataclastic coal and granulated coal when relative press between0.5~1.0.The deformation grade and content of micropores and surface to volume ratio and pores facerugosity increasing,but pore diameter decreasing,with the increasing of fractal dimension.Therefore,the higher fractal dimension indicates that the coal has a higher gas adsorption capacity.The fractal dimension could characterize pores composition and adsorption capacity.

关 键 词：分形维数 孔隙结构 吸附能力 构造煤 鹤岗煤田 低温氮吸附实验 

分 类 号：TD31[矿业工程—矿井建设]