新疆五宫煤矿瓦斯赋存的构造控制

Tectonic Control on Gas Occurrence of Wugong Coal Mine in Xinjiang Uygur Autonomous Region

摘要:

为认识构造对五宫煤矿瓦斯赋存的控制，分析了瓦斯地质演化特征，探讨了构造样式及组合对瓦斯赋存的控制。研究表明，煤系沉积后发生两次生气作用，生成了较多瓦斯。断层以逆断层为主，封闭性较好；煤层受断层影响而发生结构变形，可吸附更多瓦斯。断层使矿井处于相对封闭的水文地质单元中，阻碍了瓦斯的逸散。褶皱受断层切割多呈单斜构造，瓦斯顺层向上逸散受断层封堵。研究区构造封盖层组合类型为褶皱逆断层类型，盖层透气性较差，有利于瓦斯的保存。

Abstract:

In order to understand the tectonic control action on gas occurrence of Wugong coal mine, geological evolution characteristics of gas have been analyzed, control actions of tectonic and its types on gas occurrence have been studied as well. It is showed that twice coal generation processes have happened after coal sedimentary and generated much gas. Faults are mainly composed of reverse faults with better sealing property. Coal strata occurred structural deformation influenced by faults and could adsorb more gas. The coal mine is in a relative closed hydrogeological unit which will prevent gas fugitive. Folds were monoclinic structures cut by faults, and gas fly up along faults and is sealed by faults. The combination of structures and covering layers are fold reverse type. Sealing cover has a bad air permeability, which are useful for keeping gas.