贵州桑木场背斜北西翼煤层地质特征

Geologic Characteristics of Coal Seam in Northwest Sangmuchang Anticline of Guizhou

以桑木场背斜北西翼可采煤层为重点研究对象,对各开采煤层煤岩特征进行了深入分析,从物理性质、煤岩特征、化学特征等方面对煤层煤质进行详细对比分析,在此基础上与矿区地质特征及煤层特征的深入结合探讨成因变化,结果表明:同一煤层展布特征以龙保背斜西南翼为中心,总体呈现西南往东北逐渐减薄的趋势。区内各可采煤层以块状为主,主要为线理-细条带状结构。有机组分均以镜质组、惰质组为主,不含壳质组。区内煤层最大反射率随煤层埋深的增加在9号呈现"转折点",表明该区沉积环境中可能受岩浆岩侵入影响;硫分、灰分含量,瓦斯含量/浓度等垂向上的波动性变化表明5号、12号层处于层序旋回"最大海泛面",揭示了该区存在至少两套不同的煤储层压力系统。

Minable seam in northwset Sangmuchang is taken as an important target,it deeply analysis the coal and rock features of each mining seam,detailed compare and analysis the seam quality in physical property,coal and rock features and chemical characteristics. The result shows that the distribution characteristics of the same coal seam is the center of northwest Longbao anticline,the tendency of be thinning from southwest to northeast. In this area,the minable seam mainly is massive and lineation-thin banded structure. The organic components are mainly vitrinite and inert mass group,not include chitin group. The coal seam maximum reflectivity show the ‘turning point＇in 9#as the increase of seam buried depth,it means this area maybe influenced by magmatic intrusion in the sedimentary environment. Sulfur content,ash content,gas content/concentration and other vertical volatility change shows seam 5#and 12#in the ‘biggest marine flooding surface ＇of sequence cycle,it reveals there are at least 2 different coal reservoir pressure system in this area.