西北地区中下侏罗统煤成烃源岩评价

西北地区中、下侏罗统煤层广布,厚度较大;根据对煤的有机显微组分测试及综合统计分析表明,在西北地区,煤岩尽管并不普遍具备高含量的壳质组,但其高含量的富氢基质镜质体却具有普遍规律,富氢基质镜质体的含量占有机显微组分达18%以上,具备了煤成烃的物质基础。另外,本文提出了煤的有机地化参数类比系数法,并对煤生烃潜力进行了评价。结果表明,西北地区主要盆地煤具有较好-好的生烃能力。煤成烃具有广阔的勘探前景。

EVALUATION OF HYDROCARBON GENERATING POTENTIAL OF THE MIDDLE AND LOWER JURASSIC COAL IN NORTHWEST CHINA

The Middle and Lower Jurassic with thick coal seam is widely distributed in Northwest China.The statistical and measured organic macerals of coal indicated that high content of hydrous desmocollinite is of gene ral phenomenon with its average ratio to total organic maceral up to 18% in the region although content of exinite in coal usually is not high.Hydrous desmocollinite and exinite in coal are the principal material for hydrocarbon generation.Based on comparison coefficient of organic geochemical parameters of coal,hydrocarbon generating potential of coal in the area was evaluated.It was pointed out that hydrocabon generating potential of coal was excellent in many basins in the area,where was favourable for petroleum exploration.