【摘要】 以海孜煤矿120m巨厚火成岩下伏煤层群12个煤样为研究对象,采用工业分析、压汞试验和显微组分定量的方法,对比分析了7,8,9,10煤层的多元物性参数和与火成岩距离的关系.结果表明:煤层靠近巨厚火成岩,连续煤样的挥发分Vdaf有减小的趋势,灰分Ad有增加的趋势.煤样的孔隙率和比表面积有缓慢增大后急剧下降的趋势,这和岩浆侵入7煤有关.镜质组反射率Rm取值范围为2.358%～2.777%,煤层靠近岩床,Rm值有递增的趋势,煤的变质程度和成熟度提高.巨厚火成岩的热演化范围大于168m(1.4倍岩床厚度).火成岩像个密封盖,对下伏煤层瓦斯有圈闭作用,容易发生煤与瓦斯突出事故.更多还原

【Abstract】 Twelve fresh coal samples taken from mine numbers 7,8,9,and 10 under the Haizi extremely thick igneous rock were analyzed.The tests included proximate analysis,mercury porosimetry,and a quantitative analysis of the maceral.The relationship between the physical parameters and the location relative to the thick sill was established.The results show that volatile matter in the coal decreases,but ash increases,at locations near the sill.Surface area and porosity first increase and then fall abruptly when approaching the sill.This reflects magmatic intrusion into the coal seam.Vitrinite reflectance values increased nearby substantial intrusions,as did coal rank and maturity.A thermal alteration halo is observed as far as 168 meters from the sill boundary,which is 1.4 times the sill thickness.The intrusion sill acts as a reservoir seal under which gasses are trapped that renders the coal seam prone to coal and methane outburst.更多还原