大同煤田岩浆岩侵入对煤层煤质的影响

为探究岩浆岩侵入对煤层煤质造成的具体影响,以大同煤田鹅Ⅳ精查勘探区为研究对象,具体分析了勘查区地质构造及岩浆岩活动规律,收集以往区内施工钻孔的煤层煤质资料,并开展数据统计对比。分析表明,印支运动时期该区岩浆岩活动(煌斑岩侵入)活跃,其沿地层裂隙及断层为主要通道,以岩墙、岩床的形式侵入地层中薄弱地层,例如煤层中使其局部受热接触变质,使煤层结构复杂化、有益厚度变薄;煌斑岩侵入与煤层接触变质(干馏作用),焦化过程中可产生定量的瓦斯,瓦斯含量随煤层变质程度的增高而变大;应对该区开展三维地震工作,来验证断层及岩浆岩活动情况,可以为该区煤矿安全生产起到一定的指导作用。

Influence of magmatic rock intrusion on coal quality in Datong coalfield

In order to study the influence of magmatic rock intrusion on coal seam quality,taking the EⅣexploration area in Datong coalfield as research object,by collecting the coal seam quality data of previous construction drilling in the area,the geological structure and magmatic rock activity law of the exploration area were analyzed,and the data statistical comparison was carried out.The analysis shows that the magmatic activity(lamprophyre intrusion)was active during the Indosinian movement,and it intruded into the weak stratum in the strata in the form of rock wall and rock bed along the stratum fissures and faults.For example,the local thermal contact metamorphism complicates the coal seam structure and thins the beneficial thickness;the lamprophyre intrusion and the coal seam contact metamorphism(carbonization)can produce quantitative gas in the coking process,and the gas content will increase with the increase of the coal seam metamorphism degree.Three dimensional seismic works should be carried out in this area to verify the fault and magmatic rock activity,which can play a guiding role in coal mine safety production.