采矿与安全工程学报Issue(1)：154-160,7.
巨厚火成岩对下伏煤层瓦斯赋存的控制作用
Controlling effect of extremely thick igneous rock on gas occurrence of underlying coal seam
摘要
Abstract
To study the controlling effect of extremely thick igneous rock on gas occurrence of under-lying coal seam, five coal samples had been selected in igneous rock covered areas with different thick-ness in No.10 Coal Seam of Haizi Coal Mine. The changes of coal firmness coefficient, initial methane diffusion velocity, methane adsorption constants, outburst risk index value, etc, as the increasing of ig-neous rock thickness were tested in this paper. Meanwhile, the proximate analyses, micro porous meas-ured by carbon dioxide, scanning electron microscopy and maceral were used to study the influence of igneous rock on the coal quality and pore structure. The results show that the distribution of extremely thick igneous rock plays a control role in the coal property and gas occurrence of underlying No.10 Coal Seam. The metamorphic degree of No.10 Coal Seam has been improved under the thermal evolution and thermal metamorphic effects of igneous rock. The underlying coal seam is gradually improved from long flame coal in without igneous rock covered area to lean coal under the extremely thick igneous rock. With the thickness increase of overlying igneous rock, the micro porous of No.10 Coal Seam developes, the ability of gas adsorption and reservoir enhances, and the gas content increases. The strength of underlying No.10 Coal Seam decreases under the squeezing action of igneous rock intrusion,coal layer can be easily formed in local area. Thus, the risk of coal and gas outburst increases.关键词
巨厚火成岩/热变质作用/煤质/镜质组反射率/瓦斯赋存Key words
extremely thick igneous rock/thermal metamorphic effect/coal property/vitrinite re-flectance/gas occurrence分类
矿业与冶金引用本文复制引用
王伟,程远平,王亮,王海锋,卢守青,蒋静宇..巨厚火成岩对下伏煤层瓦斯赋存的控制作用[J].采矿与安全工程学报,2014,(1):154-160,7.基金项目
国家自然科学基金青年基金项目(51004106)；中国博士后科学基金项目(2012M510145)；国家“十二五”大型油气田及煤层气开发重大专项项目；煤层气资源与成藏过程教育部重点实验室开放基金项目(2013-005) （51004106）
