摘要
咸水、半咸水及淡水成煤环境中形成的煤层,其硫含量变化趋势由高向低.灰成分的比值则由小至大.同一煤层中的硫含量变化与成煤沼泽的覆水深度呈正相关.煤层灰分的高低与成煤沼泽中的陆源碎屑的供应及沼泽水体的流通扩散状态有关.同一煤层中的灰分含量高低与成煤沼泽古地貌关系密切,反映了风携沉积物对煤中灰分的影响.
In order to forecast, explore and exploit relative high quality coals, it is necessary to understand the aw of sulphur and ash contents and the factor controlling the changing law . For this reason the are study on the coal quality of coal scams No: Ⅰ 4, Ⅳ 4 and Ⅴ2, which were formed in diffcrent coal -aecumulationg cnviromcnts and is located in Yuxian coal district, Hcnan, have been taken by the auther
The result shows that the range of the sulphur content of the coal scam formed in salt water swamp is in exist as strawberry pyrite. The sulphur content of the coal scam formed in fresh water swamn is <0.6%. and this sulphur mainly exists as organ sulphur.
Ash content in coals is bound up with coal-accumulation cnviroment and disturbing degree of swamp water. The coal seams formed in the cabonatous shore with clear water and slight disturbance usually contain lativolow ash content. The coal scams developed in the seawardarea of abandoned delta with the disturbing water and detrital supplement frequently contain the relative high ash content; and in the landward area of abandoned delta, the relative low ash content.
The ash component in coal reflects the character of swamp water. With increasing the water salinty in swamp, ash component specific value (K = ( SiO2+Al2O3) / (Fe2O3+CaO+MgO+SO3)) gradually decreases. The coal seams formed in fresh water swamp, K=10-3.5; in salt water swamp, K<3.5.
In same coal seam the change of sulphur content is responsible for the depth of water in swamp. The depth was mainly controlled by the ancient topographical features which were effected by the thickness of underlying sandstone. Where the underlying sandstone is relative thick, the defferent compact is smaller, generally formed higher landforms, therefor the coal seams formed under the shallow water usully contain lower sulphur. These character is opposite from the places where under lying sandstone thickness is small. The higher landform in swamp catches the deposits carried by wind c
出处
《沉积学报》
CAS
CSCD
北大核心
1989年第3期83-89,共7页
Acta Sedimentologica Sinica
