豫西新安煤田煤层厚度变化规律及其控制因素

Variation of coal seam thickness and control factors in Xin'an coal field in western Henan

摘要: 豫西新安煤田煤层厚度及其变化对煤与瓦斯突出具有控制作用。采用统计、沉积环境和构造分析相结合的方法，研究了煤田内煤层厚度变化规律及成因。研究表明：新安煤田煤层厚度大(平均3.87m)，且煤厚变化大，煤层变异系数0.87，可采指数0.85，两个相邻的最薄与最厚煤厚点间的距离为25～185m。煤层平均厚度主要受成煤初期基底不平和成煤期后古河流冲蚀作用控制；煤厚变化主要受顺层剪切滑动构造作用控制。根据煤厚变化规律和成因，可对局部煤厚变化进行预测。

Abstract: Variation of coal seam thickness of Xin’an coalfield in western Henan has effect on coal and gas outburst.In combination with statistical analysis, sedimentary environment analysis and structural analysis, the paper studied the regularities and causes of variation of coal seam thickness.The results show that the thickness of coal seam is mainly controlled by the initial substrate and the ancient river erosion in coal-forming period as well as gliding structure.According to the regularities and the causes of coal seam thickness variation, it is possible to predict coal seam thickness variation locally, coal seam, but difficult to predict coal seam thickness variation regionally.