School of Resources and Earth Science, China University of Mining and Technology Key Laboratory of CBM
Resources and Reservoir Formation Process, National Ministry of Education

贵州省内煤中硫分普遍较高,中、高硫煤占相当大的比例,为了脱除煤中硫,洁净利用高硫煤,分析了煤中硫分高的原因。以煤样测试数据及煤田钻孔资料为依据,分析了黔西南糯东勘探区主可采煤层中硫的赋存特征,探讨了煤中高黄铁矿硫的形成条件及成煤环境演化。结果表明:研究区煤中硫分较高,是受煤层沉积期海水以及峨眉山玄武岩浆期后热液的双重作用造成的;这2种作用提供了大量的铁离子与硫离子是煤中高硫、高黄铁矿的物质基础,而且岩浆期后热液活动较为强烈,导致煤层中后生黄铁矿也较为发育;海水的进退导致各主采煤层中硫的分布特征在垂向和平面上都具有明显的差异性;滨岸泻湖—潮坪的成煤环境与煤层间的砂体分布特征进一步得到证实。

The middle and high sulfur coal accounts for a large proportion in Guizhou province. In order to realize the clean utilization of coal and study the genesis of high sulfur in coal, the occurrence characteristics of sulfur in main recoverable coal seams in Nuodong Exporlation Area was analyzed by using borehole data and co re test data. The formation of high pyritic sulfur and peat forming environment evolution were also discussed. The results suggested that the sulfur contents of recovera ble seams in this area were considerably high, which was attributed to the influences of seawater and post- magmatic hydrothermal activity of Emeishan basalt. The iro n and sulfur, as the materials for the precipitation of pyrite, were obtained from Emeishan basalt in the depositional basement and seawater. Besides, epigenetic pyrite had been found and theoretically derived from the intensively hydrothermal activity. The differences of distribution of sulfur content within coal seams are distinguished and attributed to seawater erosion. This conclusion is further confirmed by lagoon- tidal flat peat forming environment and the distribution character of sandstone.

国家自然科学基金资助项目(41272154)；国家自然科学基金青年科学基金资助项目(51104148)；