黄县盆地褐煤的有机岩石学特征与生烃研究

Study on Organic Petrologic Characteristics and Hydrocarbon Generation of Brown Coal in Huangxian Basin

应用全岩有机岩石学分析和热模拟实验方法,研究了黄县盆地古近系褐煤的显微组分组成、富氢组分及生烃性能。褐煤的显微组分以腐植组为主,其含量为58.0%-91.6%,惰质组含量为0-16.0%,稳定组含量为2.0%-18.8%。褐煤中富氢组分主要来自于稳定组,其中孢子体、树脂体和碎屑稳定体是其主要的生烃组分。热模拟实验表明,随模拟温度的升高,褐煤气态烃转化率以450℃为界先慢后快,液态烃在440℃（Ro为1.5%）左右达到最高峰,470℃以前气态烃转化率低于液态烃,在470℃以后气态烃高于液态烃。

By using the whole- rock analysis of organic petrology and thermal simulation experiment method,some indexes are studied,including the maceral composition,hydrogen- rich components and hydrocarbon generation characteristics of brown coal in Huangxian Basin. Brown coal maceral is given priority to the huminite,which are within the range of from 58. 0% to 91. 6%,the content of inertinite is from 0 to 16. 0%,and the content of liptinite is from 2. 0% to 18. 8%. The hydrogen- rich maceral of brown coal mainly comes from the liptinite,and the main hydrocarbon- generating maceral in which are sporinite,resinite and liptodetrinite. Thermal simulation experiment shows that,with the simulation temperature increasing,the gaseous hydrocarbon conversion rate of brown coal is slow before 450 ℃ and fast after 450 ℃,and the liquid hydrocarbon conversion rate reachs the maximum at 440 ℃（ Ro= 1. 5%）.The gaseous hydrocarbon conversion rate is lower than the one of liquid hydrocarbon before 470 ℃,and it is higher than the one of liquid hydrocarbon after 470 ℃.