摘要
利用勘探钻孔煤心煤样的煤层瓦斯(煤层气)含量测定数据可求得煤层瓦斯自解速率和自衰系数,二者能直接而客观的反映煤中气体逸散的基本特征,对生产矿井煤层瓦斯涌出方式判断及突出危险性评价很有实用价值,可作为瓦斯突出危险性评价新指标。本文介绍了自解速率和自衰系数的计算方法,列举了陕北侏罗纪弱粘煤、山西晋城石炭二叠纪无烟煤及其它地区部分煤层的计算结果,分析了瓦斯含量、煤体结构、煤层温度等因素对自解速率和自衰系数的影响。
Both natural desorption rate and natural attenuation coefficient of coal seam gas are calculated by making use of the gas contents determined from coal cores during coal and coalbed methane exploration. Natural desorption rate and attenuation coefficient are able to reflect objectively fundamental characteristics of gas emission from coal, and they have a practical value to judge gas emission method and outburst danger assessment in coal mines. The calculation methodology of natural gas desorption rate and attenuation coefficient are described in this paper. The result calculated on weakly caking coal of Jurasic in North Shaanxi, anthracite of Carboniferous-Permian in Jincheng of Shanxi and other kinds of coal from other districts is presented, the impact of some facts like gas contents, coal body texture and coal seam temperature on natm＇al desorption rate and attenuation coefficient is analyzed.
出处
《中国煤层气》
2009年第4期24-27,共4页
China Coalbed Methane
基金
国家重点基础研究发展规划"973"项目(2003CB214602)
国家十一五科技支撑计划项目课题(2006BAK03B01)
关键词
煤层瓦斯
自解速率
自衰系数
瓦斯突出
危险性评价
Coal seam gas
natural gas desorption rate
natural attenuation coefficient
gas outburst
danger assessment
