塔里木盆地煤及其显微组分超高温开放体系热模拟实验气态产物对比研究

通过对塔里木盆地煤及其显微组分进行以1 K/min升温速率的开放体系热模拟实验(最高实验温度为1 200℃),获得了煤岩与各显微组分气态产物产率与累计产量变化。对比分析了煤及其显微组分生成气态产物CH₄、N₂和CO变化特征，其中 N₂生成温度高于CH₄和CO; H₂生成时间与CH₄相一致(说明了氢为烃类气体形成的关键因素）。煤及其显微组分生烃潜力具有壳质组>镜质组>煤>半丝质组≥ 丝质组的特征，说明煤岩生烃潜力主要由其显微组分控制；虽然壳质组在煤岩中含量很低,但生烃潜力高于其他显微组分。煤岩生成的N2具有双峰型特征，说明了前后峰N₂具有不同来源，前者来源于无机矿物（如含铵粘土）的分解，后者来源于有机质热降解；显微组分生成N₂主要为高温阶段，说明了显微组分在分离过程中可能造成部分无机矿物的损失。

Comparison of the Gas Compound Generation of Tarim Coal and Its Macerals in Open System Non-Isothermal Pyrolysis with Ultra-high Temperature

Open system nonisothermal pyrolysis at a heating rate of 1K/min, in which Tmax was 1 200℃, was performed on immature coal (R_O=0.4%) from the Tarim basin, and isolated macerals (vitrinite, exinite, fusinite and semi\|fusinite), and the gas generation rate and cumulative gas production of the coal and its macerals were gotten. The gas compounds (i.e. CH₄, N2, CO, etc) from the Tarim coal and its macerals in the pyrolysis were contrastively described, where the temperature of N₂ generation was higher than that of CH₄ and CO, and the temperature of H₂ formation was consistent with the CH₄, suggesting hydrogen would be an indispensable agent for hydrocarbon gases. The sequence of hydrocarbon generation potential from coal and its macerals occurs as follows: exinite>vitrinite>coal>semi\|fusinite≥fusinite. This result indicates the hydrocarbon generation potential of coal would be controlled by its macerals. Although the exinite content in coal is the lowest than other macerals it had the greatest potential of hydrocarbon generation. The distinct two\|peak generation of nitrogen from coal indicated two potential sources, the former from inorganic matter, such as ammonium clays, and the latter mainly from organic matter. N2 generation from the macerals occurs at the high temperatures due to the partial loss of inorganic matter during the maceral isolation.