杨娟,王作栋,薄海波,张婷,吉生军,王静莹
Yang Juan,Wang Zuo-dong,Bo Hai-bo,Zhang Ting,Ji Sheng-jun,Wang Jing-ying
摘要: 对华北张家口中元古界下马岭组低熟海相页岩进行温压模拟实验,并对原始样品和模拟后的残渣抽提物做了GC/MS分析,讨论了2种温压模式下三芴系列化合物(以下简称“三芴”)的演化规律。结果表明,三芴的相对含量受温度影响,且压力在不同温度条件下对三芴含量也有较大影响。主要表现在以下方面:①随着温度升高、压力增大,呈现出F的相对含量增大、OF含量减小、SF含量无明显变化的规律,三芴相对丰度表现出F>OF>SF特征;②温度低于390℃时,温压共同作用比单一温度作用更易使有机质进入成熟阶段;③温度低于337℃时,加压抑制了共轭烯键的芳构化;温度高于337℃时,加压促进了共轭烯键芳构化;在327~450℃温度范围内,硫芴表现出较好的热稳定性;④随着温度的升高,模拟实验样品的成熟度从未成熟演化到成熟晚期,三芴含量的原始比例构成发生了较大变化,故利用三芴相对含量判断有机质沉积环境时,要考虑温度对三芴相对含量变化的影响。
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[1] | 王作栋,梁明亮,郑建京,李晓斌,李中平,钱宇. 华北中—上元古界下马岭组烃源岩分子指纹特征[J]. 天然气地球科学, 2013, 24(3): 599-603. |
[2] | 陈践发,孙省利 . 华北新元古界下马岭组富有机质层段的地球化学特征及成因初探[J]. 天然气地球科学, 2004, 15(2): 110-114. |
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