基于多重分形理论的瓦斯异常区煤层孔隙非均质性研究  

Research on Pore Heterogeneity of Coal Seam in Gas Anomalous Areas Based on Multifractal Theory

作　　者：吴晓军 王宇鹏 WU Xiaojun;WANG Yupeng(China National Coal Tianjin Design Engineering Co.,Ltd.,Tianjing 300120;SDIC Hami Energy Development Co.,Ltd.,,Xinjang 839000)

机构地区：[1]中煤天津设计工程有限责任公司,天津300120 [2]国投哈密能源开发有限责任公司,新疆839000

出　　处：《中国煤层气》2024年第5期33-37,共5页China Coalbed Methane

基　　金：国家自然科学基金面上项目——低煤热解大分子结构裂解产氢的分子级作用机理(42072199)。

摘　　要：为了探究引起瓦斯异常的微观孔隙结构因素,运用高压压汞实验对比研究了瓦斯异常区与正常区煤样孔隙发育特征,引入多重分形理论定量表征了孔隙非均质性,并分析了孔隙结构及其非均质性对瓦斯赋存与异常的控制作用。结果表明煤样孔隙结构具有多重分形性质,异常区煤样各尺度孔隙分布均匀,非均质性较低而连通性较强。具有类似微观结构的煤层为有利于瓦斯聚集赋存,但墨水瓶形孔制约了瓦斯逸散,形成局部高压瓦斯区,易引起瓦斯异常。To explore the effect of microscopic pore structure on gas anomalies,the pore characteristics of coal samples from gas anomalous and normal areas are compared by using high-pressure mercury intrusion experiments.The multifractal theory is introduced to quantitatively characterize the pore heterogeneity and the control effects of pore structure and its heterogeneity on gas occurrence and anomaly are analyzed.The results show the pore structure of coal samples has multifractal properties,and the pore distribution is uni-form in the samples from anomalous areas,with low heterogeneity and strong connectivity.The coal seams with similar micro-structure are favorable for gas accumulation and occurrence,but the ink-bottle pores re-strict the gas diffusion,forming local high-pressure gas zones,which are prone to cause gas anomalies.

关 键 词：孔隙结构 非均质性 多重分形 瓦斯异常 开滦矿区 

分 类 号：TD7[矿业工程—矿井通风与安全]