摘要
取新疆克拉玛依油区白垩系地层中的石油沥青作热解模拟实验,当沥青加热到400℃时有近1/3转化为轻质油,600℃时近1/2的沥青转化成了气。对残余烃的研究表明,在石油向沥青转化时形成新的类干酪根物质,在达到一定的温度时重新释放出可溶有机质,并导致残余烃族组成及生物标志物发生规律性变化,高碳数正烷烃的释放先于低碳数烃,而五环三萜类则晚于三环萜。
The samples of petroleum asphalt involved in the experiment was taken from the Cretaceous rocks in Kramay Oil Field,Xingjiang.It is showed that near 1/3 of the asphalt turns into light oil as it is heated to 400℃,and near 1/2 of it turns into gas as to 600℃.The study of residual hydrocarbon makes it clear that a new kerogenoid substance is generated as oil turns into asphalt and dissoluble organic matters are released again when heated to certain temperature,resulting in regular changes of the components of residual hydrocarbon family and the biological markers.The high-carbon number normal alkane is re- leased prior to the low-carbon number hydrocarbon,and the pentacyclic triterpane is later than the tri- cyclic terpane.
关键词
石油
沥青
有机质演化
热解模拟
再生烃
petroleum asphalt,thermal simulation,simulation test,pyrolytic product,biological marker,organic matter evolution
