潞安矿区3号煤层瓦斯构造控制因素分析

Analysis of structure factors of No.3 Coal Seam in Luan Mining Area

以潞安矿区各煤矿3煤层瓦斯含量为依据,运用瓦斯赋存构造逐级控制理论研究了矿区瓦斯赋存特征。分析认为,矿区瓦斯浅部含量低,深部含量高,各矿瓦斯涌出由东向西呈现逐渐增加的趋势;以两大断褶带为界限,将矿区划分为北部(Ⅰ)、中部(Ⅱ)和南部(Ⅲ)三个瓦斯地质单元:Ⅰ区井田总体处于拉张体制下形成,使得井田内部分瓦斯得到释放;Ⅱ区东部近东西向断裂处于拉张体制,使得瓦斯大量逸散,至西部构造变形微弱,近南北向的褶曲和逆断裂有利于瓦斯保存,成为高瓦斯区;Ⅲ区构造复杂,尤其在深部,褶曲构造受后期构造运动影响较小,煤层瓦斯富集,瓦斯压力较大。

Based on No.3 coal seam gas content of each coalmine in the Luan mining area, using gas hosting structure level by level controlling theory studied mining area gas hosting features. The analysis considered that gas content in the mining area is low in shallow part, high in deep part; gas emission of each coalmine presents a trend of gradually increasing from east to west. Taking the two folded zones as the limit, divide the mining area into three gas geological units, namely northern （I）, central （Ⅱ） and southern （Ⅲ）. The minefield in the unit I has formed under an extensional system as a whole, bringing part of gas in the minefield released; near EW faults in eastern part of the unit II are under an extensional system, bringing a great deal of gas escaped, structural deformation weakening westwards, near NS folds and reverse faults are propitious to gas preservation, thus the high gas area; structures in the unit Ⅲ are complex, especially in the deep part, succeeding tectonic movements have only less impacts on folded structures, coal seam gas enriched, thus larger gas pressure.