准东煤田煤质特征及分布规律

摘要

对准东煤田主要勘探区钻孔可采煤层煤质资料分析，从煤岩学和煤化学方面初步总结了煤田的煤质特征和分布规律。煤田煤的化学组成以低灰分、中高挥发份率、低硫、低磷和低氯为特征。煤田东部煤中灰分和镜质组含量相对高于西部。分析准东煤富惰质组和低灰分含量成因，认为可能在泥炭沼泽形成时期，泥炭的生长速率约大于基底沉降速率，泥炭沼泽表面长时期处于沼泽的潜水面之上，具有相对氧化、物源碎屑影响小的高位泥炭沼泽环境条件所致。煤田东部基底沉降速率相对较快，物源碎屑供应相对充分。%This research summarize the coal quality and its distribution in the Eastern Junggar coalfield by coal petrolo-gy and coal chemistry.The coals have medium moisture and low ash contents,medium-high volatile matter yield,and low S, P and Cl contents.The ash and vitrinite contents in the eastern of this coalfield are relatively higher than those in the western.The high inertinite and low ash contents in Eastern Junggar coals are due to that aggregation rate of peat is rela-tively rapid than subsidence rate of the basement, the surface of the peat bog was above the water level,and was charac-terized by relatively oxidizing and stable raised bog,with low detrital influence,during the peat bog accumulation period. In the eastern part of the coalfield,the ash and the vitrinite contents are relatively higher due to the relatively high subsid-ence rate of the basement and high detrital supply.