织纳煤田红梅煤矿煤中硫分特征及其成煤环境研究

Study on sulfur characteristics and coal paleoenvironment in Hongmei Mine of Zhina Coalfield

为分析贵州西部织纳煤田以发育海陆过渡相含煤岩系而成为研究高硫煤与成煤环境之间关系,根据地质勘探资料和煤心煤样的化验结果,对贵州织纳煤田织金矿区红梅煤矿煤中硫分在平面、垂向上分布特征及硫分组成特征与成煤环境的关系进行了研究。研究结果表明:该矿可采煤层全硫较高、变化较大;硫分垂向上总体呈先减小后增加的趋势;平面上主要呈现由南东向北西方向减小的趋势;形成于海进环境的7煤、21煤、23煤、27煤中高硫煤达80%以上,均分布在矿区南东部(靠海一侧),而形成于海退环境的17煤的硫分较低;黄铁矿硫(S_(p,d))含量的增加是导致该区煤中硫分变高的主要原因,硫分高低与泥炭沼泽受海水影响的程度有直接关系,综合分析确定6煤、7煤、21煤、23煤、27煤形成于浅水潟湖体系,受海水的影响程度较大;而16煤、17煤形成于潮控三角洲体系,受海水的影响程度较小。

The Zhijin-Nayong Coalfield in western Guizhou Province is well developed with marine-continental transitional facies and limestone markers,and thus became an ideal for studying sulfur characteristics and its paleoenvironment in coal.Based on geological exploration data and labor results of coal samples,the sulfur contents and distribution characteristics in coal as well as the relationship with paleoenvironment were studied in Hongmei Mine of Zhina Coalfield,Guizhou Province.The results show that in general the sulfur content of each coal seam is rather high,varied from a low sulfur to a high sulfur.In vertical direction,the sulfur content of different coal seams is reduced from high to low and from low to high.On the contour,the sulfur content in different areas of the same coal seam decreases gradually from the south east to the north west.The sulfur content in coal of No.7,21,23,27 seam formed transgressive period is up to 80%,distributed in the south east（ near the sea side）,and No.17 seam formed regressive period is a low sulfur coal.The increase of pyritic sulfur content is the main factor that leads to a high sulfur content of coal seam.The sulfur content and the influence of sea water in the study area has a direct relationship.The comprehensive analysis determined that No.6,7,21,23,27 seam in Hongmei Mine were formed in the shallow lagoon system under the influence of sea water and No.16,17 seam were formed in the delta system less affected by sea water.