内蒙古红柳大泉勘查区煤层煤质特征研究

内蒙古自治区额济纳旗红柳大泉侏罗纪山间盆地,面积大于2 400 km~2,聚煤作用发生于盆地边缘部位,全区预测煤炭资源量约2亿t。该文利用钻探及测井数据,分析认为该区龙凤山组主采煤层(4煤层)在西区呈西厚东薄、北厚南薄的趋势;在东区呈南厚北薄的特点。4煤层煤类为长焰煤,高挥发分、低硫、中高发热量、中灰,且灰分含量沿盆地边缘向盆地中心明显减少,西区焦油产率沿盆地边缘向盆地中心明显增加。探讨了煤炭开发利用方向为动力燃料用煤、民用煤。主采煤层其自燃倾向性属容易自燃—自燃,应切实做好防、灭火工作。

Study on Characteristics of Coal Strata in Hongliudaquan Exploration Area in Inner Mongolia

The area of Jurassic mountain basin in Hongliudaquan of Ejinaqi in Inner Mongolia Autonomous Region is more than 2400km2. Coal accumulation occurred in the edge of the basin. The coal reserves is predicted of 2 billion tons. According to drilling and logging data, it is regarded that the thickness change of main coal strata (No.4 coal stratum) of Longfeng Mountain group has the trend thin in the east and thick in the west, thin in the south and thick in the north in western area;while thin in the north and thick in the south eastern area. No.4 coal stratum is flame coal with high volatile, low sulfur, high calorific value and medium ash. Ash content significantly reduce along the edge to center of the basin. The tar yield has increased obviously along the western edge to the center of basin. The direction of coal exploitation and utilization is coal for power fuel and civil coals. The spontaneous combustion tendency of main coal strata is easy to spontaneous combustion. We should do a good job of preventing and extinguishing fires.