论文部分内容阅读
为了客观评价煤系烃源岩的生气特征和生气量，采用限定体系黄金管热模拟实验技术，对采自鄂尔多斯盆地的不同地质时代煤系烃源岩（煤岩和煤系泥岩）样品进行了生气热模拟实验研究，详细讨论了煤系烃源岩热解生气特征与气体碳同位素变化。结果表明，煤系烃源岩具有较好的生气性能，煤岩与煤系泥岩热解生成气态烃产率相差不大，两者具有相似的生气演化特征，即随热模拟温度升高，煤岩和煤系泥岩热解生成甲烷的产率逐渐增加，甲烷最大产率分别达211.69 m3/t和184.47 m3/t，而C2-5产率是先增加后降低，在热模拟温度430℃～470℃达到最大值，分别为19.14 m3/t和6.87 m3/t；煤岩和煤系泥岩热解气组分碳同位素值总体上随热模拟温度升高而变重，且相同热模拟温度时具有δ13C1<δ13C2<δ13C3的特征，其中煤系泥岩热解气甲烷、乙烷碳同位素值较煤岩分别偏轻0.3‰～2.1‰和1.4‰～3.7‰。在此基础上，建立了煤系烃源岩（煤岩和煤系泥岩）的生气模式。“,”To assess gas generation characteristics and gas yield from coal measures source rock objectively, using confined system gold-tube pyrolysis experiment technology carried out gas generation thermal simulation experimental study on samples from Ordos Ba?sin coal measures source rocks (coal and mudstone) of different geologic ages, discussed coal measures source rock pyrolytic gas genera?tion characteristics and gaseous carbon isotope variation in detail. The result has shown that coal measures source rock has better gas generation performance. The difference between gaseous hydrocarbon yield from coal and mudstone pyrolysis is small;both have simi?lar gas generation evolution characteristics, along with thermal simulation temperature build-up, methane yield gradually increasing, the maximum methane yields can be 211.69 m3/t and 184.47 m3/t respectively;C2-5 yields increasing first then decreasing, highest dur?ing 430℃~470℃, 19.14 m3/t and 6.87 m3/t respectively. Carbon isotope values in coal and mudstone pyrolytic gas component increas?ing along with thermal simulation temperature build-up as a whole, and have characteristics ofδ13C1<δ13C2<δ13C3 under the same temper?ature, in which, methane, ethane carbon isotopes from mudstone are lighter than from coal 0.3‰~2.1‰and 1.4‰~3.7‰respectively. On this basis has modeled a coal measures source rock (coal and mudstone) gas generation model.