四川省煤层瓦斯赋存分布规律

Gas Occurrence and Distribution of Coal Seam in Sichuan Province

搞清煤层瓦斯赋存规律是做好瓦斯灾害防治和生产规划的前提和基础。应用瓦斯地质的研究方法,结合四川省煤矿瓦斯地质图编制资料,探讨了四川省煤层瓦斯赋存分布规律。研究结果表明:四川省煤层瓦斯赋存具有明显的分区性,晚二叠世煤层瓦斯赋存明显高于晚三叠世煤层;叙永-筠连叠加褶皱带和华蓥山滑脱褶皱带晚二叠世煤层长期处于强烈的构造挤压中,构造煤发育,加之煤变质程度高,瓦斯含量高,是全省突出矿井主要集中在该区域的根本原因;芙蓉矿区位于叙永-筠连叠加褶皱带中段北部,主控构造珙长背斜是由多个次级背、向斜组成,且除其倾伏端发育的中型断层对煤层有一定破坏作用外,无切割煤系的区域性断层,有利于瓦斯保存,是造就该矿区成为四川省瓦斯灾害最严重的矿区的原因。

Understanding the occurrence law of coal seam gas is the premise and foundation of gas disaster prevention and production planning.Basing on research methods of gas-geology,combining with datum of Sichuan province coal mine gas-geology map,the gas occurrence and distribution law of coal seam in Sichuan province was discussed.The results show that the gas occurrence and distribution in Sichuan province is obvious.Gas occurrence in the Late Permian coal seams is significantly higher than that in the Late Triassic coal seams.Late Permian coal seams in the Xuyong-Junlian superimposed fold belt and the Huayingshan detachment fold belt are high gas occurrence zones.These two zones have been under strong structural compression for a long time,tectonic coal stratified,which are the fundamental reasons why outburst mines in Sichuan province are mainly located in this region;Furong mining area locates in the middle north of Xuyong-Junlian superimposed fold belt.Its controlling structure is Gongchang anticline composed of multiple secondary anticlines and synclines,and there are no regional faults cutting coal measures,except that the medium-sized faults develop at its dip end have a certain destructive effect on the coal seam,which are in favor of gas preservation and the reasons why Furong mining area is the most serious gas disasters mining area in Sichuan province.