叠瓦状逆冲断层构造特征及控煤作用——以六盘水煤田麦子沟煤矿为例

Imbricate Thrust Structural Features and Coal Controlling-A Case Study of Maizigou Coalmine in Lupanshui Coalfield

聚煤期后的控煤构造是控煤作用研究的重要内容之一,决定了找煤方向及煤炭勘查和开发难度。根据地质、钻探工程、测井数据等勘查资料对六盘水麦子沟煤矿的构造特征进行构造解析,探讨了煤矿的控煤构造。研究显示:煤矿断层组合属叠瓦状逆冲断层组合,该组合对煤层进行破坏和改造,造成含煤地层缺失及重复;叠瓦状逆冲断层主断层F3的上覆系统为逆冲叠瓦扇,下伏系统为叠瓦状逆冲断层组合形成之前的褶皱构造,上下两套系统属不同的构造类型且具有明显的位移;上覆系统的滑移距离约为170~820m,且具有逆时针旋扭的性质。六盘水麦子沟煤矿控煤样式属于逆冲叠瓦扇型。

Study on coal controlling structure after coal accumulation stage is one of coal controlling study essentials;it determines coal prospecting orientation and coal exploration,exploitation difficulties.Based on surface geology,drilling,well logging data carried out structural analysis for the Maizigou coalmine structural features in the Lupanshui coalfield,and quantitatively,semi-quantitatively discussed coalmine coal controlling structures.The study has shown that coalmine fault combination belonged to imbricate thrust combination;the combination carried out coal seam destruction and reform,caused coal-bearing strata hiatus and repetition.Main fault F3 of imbricate thrust overlying system is thrusting imbricate fan,underlying system is fold structure before imbricate thrust combination formed.Upper and lower two systems belong to different structural types with obvious displacement,slip distance of overlying system is about 170~820 m with anticlockwise twisting property.Lupanshui coalfield Maizigou coalmine coal controlling pattern belongs to thrust imbricate fan type.