韩城矿区构造特征对煤层含气性的影响

摘要

The control action of structure to gas-bearing of coal seam on the basis of systematicly researching geologic structure characteristics in Hancheng mining area is analyzed.The result indicates that the mine is locate in the transitional zone between the south margin of north China platform and Qinling fold belt,decides the development prospects of coalbed methane in terms of reginal structure.On the secondary structure traces combination features the basic tectonic framework such as shallow fault-folded belt within the mining area,compressive resistance structural zones,gently inclined structural zones and deep monoclinal zones result in coalbed gas contents increase from outside mining area to inside.On structure type,the highest gas contents occur at syncline axis and gently inclined belt,the lowest values occur in normal fault and shallow structure,while medium values occur at anticline.%在系统研究韩城矿区构造特征的基础上，剖析了构造对煤层含气性的控制作用。研究表明：区域构造背景上，矿区位于华北地台南缘与秦岭褶皱带过渡区，决定了矿区具备煤层气开发前景。次级构造形迹组合特征上，矿区内部浅部断褶带、挤压阻气构造带、缓倾斜构造带、深部单斜带的基本构造格局致使煤层气含量由矿区周边向腹部增高。控气构造类型上，向斜轴部、缓倾斜带含气量最高，背斜次之，正断层和边浅部含气量最低。