辽宁省煤矿瓦斯赋存构造控制规律与瓦斯分带划分

瓦斯赋存规律认识不清,是导致煤矿瓦斯突出灾害频发的根本原因。应用瓦斯赋存地质构造逐级控制理论,结合辽宁省煤矿瓦斯地质图编制资料,分析了全省瓦斯赋存构造控制规律,进行了瓦斯分带划分。研究结果表明:印支运动(主幕),在形成一系列EW向、NE向和NW向断裂褶皱带过程中,煤体破坏,形成构造煤。燕山运动,形成了一系列NNE向、NE向的褶皱和逆冲推覆构造,与EW向构造相叠加,构造应力集中,有利于瓦斯突出;同时,岩浆侵入煤系地层使煤变质程度增高,生烃能力增强。喜马拉雅运动时期,挤压作用逐步被拉张取代,拉张裂隙作用有利于瓦斯部分释放。将辽宁省煤矿瓦斯赋存分布划分4个高突瓦斯带,即阜新-铁岭高突瓦斯带、抚顺-沈北高突瓦斯带、北票-南票高突瓦斯带和红阳-本溪高突瓦斯带。

Tectonic-level-control rule and zone-dividing of coalmine gas occurrence in Liaoning Province

Unclear understanding of the gas occurrence rule is a root cause of frequent gas outburst disasters .Based on theory of gas occurrence tectonic level control , and combining with datum about gas-geology map of Liaoning Province , the tectonic-level-control rule and zone-dividing of gas occurrence were discussed .The results showed that tectonic coal formed during the forming of EW , NE and NW faults and folds which were controlled by Indosinian movement .NNE, NE folds and overthrust formed during Yanshan movement , through compounding with the EW geological structure , it caused the tectonic concentrated stress which is prone to coal and gas outburst .At the same time , Yanshanian magmatism increased coal metamorphism and the hydrocarbon productivity of coal was enhanced . During Himalayan movement , tectonic compression was replaced gradually by tectonic extension , which was beneficial to gas release .Coalmine gas occurrence and gas distribution in Liaoning Province were divided into four high and outburst zones , such as Fuxin-Tieling, Beipiao-Nanpiao and Hong Yang -Benxi.