黔北林华井田煤质参数特征及其成煤沉积环境意义

Coal quality parameters features and coal formation sedimentary environment significance of Linhua Minefield in north Guizhou

基于林华井田主采煤层煤样的工业分析、硫分及灰分等数据,评价了该区龙潭组煤的总体煤质特征,并探讨了煤中硫分和灰分与成煤沉积环境的关系。研究结果表明:黔北林华井田龙潭组煤具有热演化程度高、煤岩类型多样、灰分和硫分中等-高、水分含量极低等特征,煤种属3号无烟煤。硫的形态数据分析显示,煤中黄铁矿硫占全硫比重较大,全硫分低于3.0%的煤层中黄铁矿硫含量与全硫分含量呈线性正相关。主采煤层硫分及灰成分组成参数的纵向变化规律可清晰反演龙潭组成煤沼泽微环境的变化,综合分析确定黔北林华井田的13煤、15煤形成于受海水影响作用较大的潟湖相泥炭沼泽环境,而4煤、5煤、9煤形成于受海水影响较小的潮坪相泥炭沼泽环境。

Based on the proximate analysis,sulfur content,ash content and other data of the coal samples from the main mining seams in Linhua Minefield,the general coal quality features of Longtan Formation were evaluated and the relation between the sulfur content and ash content of the coal as well as the coal formation sedimentary environment was discussed. The results showed that the coal from Longtan Formation in Linhua Minefield in north Guizhou would have a high thermal evolution degree,diversity coal and rock types,medium and high ash content and sulfur content,ultra low moisture content and other features. The coal would be No. 3 anthracite coal. The analysis on the morphological data of the sulfur showed that the pyritic sulfur in the coal would take a high percentage of the total sulfur proportion and in the seam with full sulfur content lower than 3.0 %,the pyritic sulfur content would be in a linear positive correlation to the full sulfur content. The longitudinal varied law of the sulfur content and ash content composed parameters could clearly inverse the variation of the coal formation marsh micro-environment in Longtan Formation. The comprehensive analysis determined that No. 13 seam and No. 15 seam in Linhua Minefield of north Guizhou were formed in a lagoon facies peat swamp environment highly influenced by the sea water and No. 4seam,No. 5 seam and No. 9 seam were formed in a tidal flat facies peat swamp environment less influenced by sea water.