鄂尔多斯盆地西南缘煤矿瓦斯地质条件

鄂尔多斯盆地西南缘的彬长矿区开采侏罗系4号煤层,大地构造位置处于华北板块鄂尔多斯盆地渭北隆起带西部的彬长坳褶带内,矿区内瓦斯含量总体偏低,但褶皱地带及断层附近存在高瓦斯区域。研究结果显示,该区瓦斯含量主要受断层和褶曲构造的控制,瓦斯涌出量基本与煤层底板标高为负相关,与煤层厚度为正相关,与煤层埋藏深度和上覆基岩厚度呈正相关,总体上彬长矿区瓦斯涌出量从矿区周边向中部有明显增大的趋势,瓦斯绝对涌出量将随着煤矿生产能力的增大而增大。矿区瓦斯资源总量约44.91亿m3,可开发量约12.94亿m3,具有较好的开发前景,应尽早开展总体规划,统筹考虑,科学开发利用。

Gas Geological Condition of Coalmines on Southwestern Margin of Ordos Basin

The Binchang mining area on the southwestern margin of the Ordos Basin is now mining Jurassic No.4 coal seam.Tectonic location of the mining area is within the Binchang depression/fold belt,Weibei uplift zone in the Ordos Basin,North China plate.As a whole,the gas content is on the low side,but high gas content regions are existed near the folded area and faults.The studied result has demonstrated that gas content in the area is mainly controlled by faults and folds.Gas emission basically presents negative correlation with coal seam floor elevation,positive correlation with coal thickness,buried depth and overburden thickness.In the mass,gas emission has an increasing tendency from mining area periphery toward the center,absolute emission increasing along with coalmine capacity.Total resource of gas in the mining area is about 4.491 billion cubic meters,exploitable about 1.294 billion cubic meters,thus has preferable exploitation prospect.Overall planning at the earliest opportunity,plan as a whole and scientifically exploitation and utilization have been suggested.