豫东地区岩浆活动对煤层结构及煤质的影响

Effects of igneous intrusions on texture and quality of coal seam in eastern Henan Province

为指导豫东地区煤矿合理部署、高效生产,基于大量钻井和测试资料的综合分析和对比研究,探讨了豫东地区岩浆活动的基本特征及其对煤层结构和煤质的影响。研究结果表明:燕山中晚期的岩浆活动对豫东地区的煤层结构和煤层连续性造成影响,导致煤层变薄、分叉、尖灭和吞噬;同时,岩浆活动导致本区煤层变质程度普遍增高,煤质参数发生变化。煤层的原始赋存状态、岩浆侵入的初始温度、侵入岩体的厚度、岩浆侵入煤层的方式、岩体离煤层的距离、围岩和岩体上覆地层的岩性等是影响煤层结构和煤变质程度的主要控制因素。

To guide reasonable deployment and efficient production for coal mine in eastern region of HenanProvince, based on the comprehensive analysis and comparative study of a large number of drilling and test data,this paper explores the basic features of magmatic activities and their influence on the coal texture and coal qualityin eastern region of Henan Province. The result shows that magmatic activities during middle-late stage of Yanshanperiod has effected the texture and the continuity of coal seams, causing the thinning, bifurcate and pinch-out ofcoal seams in the eastern region of Henan. Moreover, magmatic activities led to the general increase inmetamorphic grade of coal seams, and the change of coal quality parameters. The main control factors influencingcoal texture and coal metamorphism degree include the primitive occurrence state of coal seams, the initialtemperature and the thickness as well as styles of the magmatic intrusion, the distance of the magmatic intrusionfrom coal seam, surrounding rock mass and lithology of overlying strata.