浅析许厂煤矿3_下煤层厚度变化规律及其影响因素

Research on change law and influential factors of the No.3 lower coal seam thickness in Xuchang mine field

许厂煤矿3下煤层厚度及其变化直接影响着井下工作面的部署。通过对钻井数据的统计、沉积相和构造特征的综合分析,研究了井田内3下煤层的厚度变化特点及其成因。研究发现:3下煤层厚度变化较大,整体上呈现由中东部向其它方向逐渐减薄的规律,这一变化规律的主控因素为煤层形成时的沉积环境;其次,成煤期后的河流冲蚀对局部地区的煤层同样造成了较大的影响;后期构造运动对煤厚的影响相对较小。

The variation of No.3 lower coal seam thickness in Xuchang mine field has direct influence on the deployment of the coal faces. Based on the analysis of the geological statistics of drillings, sedimentary facies and tectonic features, changing characteristics and causes of the No.3 lower coal seam thickness has been studied. The research shows that the variation of No.3 lower coal seam thickness is obvious. The coal seam becomes thinner and thinner from the center and east areas to the others, which is mainly controlled by the sedimentary environment in coal-forming period. Besides, the ancient river erosion also has great effect on the coal seam thickness in some local areas. Tectonics has little effect on the variation of coal seam thickness.