弧形构造带控气特征

Characterisitics of gas controlling in arc structure belt

基于弧形构造带对瓦斯富集程度及瓦斯灾害的分区性,探讨了弧形构造三度弯曲的控气特征。其中,第一度和第二度弯曲总体上控制了煤层气的赋存特征及补给、运移和逸散条件,第三度弯曲及其伴生的横张断裂控制了煤层气富集区域的平面展布。多个经历三度弯曲的弧形构造组成弧形构造带,引入处于徐宿弧形构造带不同区域的芦岭煤矿、桃园煤矿、孙疃煤矿实例,表明弧形构造带内弧带弧顶区域逆断层发育、瓦斯富集、瓦斯灾害严重,外弧带张裂隙、正断层发育、瓦斯含量相对较低。

The characterisitics of gas controlling are discussed in the three degree bend of arc structure based on the arc structure belt for gas enrichment and gas disaster division. The first degree and second degree bend control the occurrence characteristics,supply,transport and dissipation conditions of coal bed gas in the overall,the third degree bend and its accompanying transverse fracture control the plane distribution of coalbed gas enrichment area. The arc structural belt is composed of three degree bend. Examples of different districtions of Xu-Su arc structure belt such as Luling,Taoyuan and Suntuan coal mines show that there are reverse fault development,gas accumulation and serious gas disasters in the internal arc belt of arc structure belt,and there are separation fracture,normal fault development and lower methane gas content in outer arc belt.