某些海相烃源岩中多环芳烃的组成特征

CHARACTERISTICS OF POLYCYCLIC AROMATIC HYDROCARBON ASSOCIATIONS IN SOME MARINE SOURCE ROCKS

多环芳烃化合物在原油及岩石抽提物中普遍存在，有关参数作为热成熟度和沉积环境的标志受到了广泛的关注。通过因子分精，研究了美国6个盆地古生代海相烃源岩抽提物中多环芳烃组成和分布。4个主因子所代表的芳烃组合及其参数与地质作用的关系为：①热力燃烧作用；②沉积环境；③成熟度；④早期成岩作用。探讨了甲基菲成熟度参数的环境意义，因子载荷反映，1-甲基菲和9-甲基菲受沉积环境的影响比较大。因子分析结果表明，影响多环芳烃形成的主要地质因素是高温热力作用、沉积环境、成熟度和早期成岩作用；可以通过多环芳烃的组成特征。

Polycyclic aromatic hydrocarbons are common constituents of petroleum and rock extracts and a considerable attention has been paid to their relevant parameters being as indicators of thermal maturity and environment. Polycyclic aromatic hydrocarbon distributions and compositions in rock extracts of representative samples from six basins of United States have been analyzed by factor analysis. The four factors which represent the relation of aromatic hydrocarbon compositions and ratios with geological influence are suggested to be as follows: ① pyrolytical and combustion process, ② depositional environment, ③ thermal maturity and ④ early diagenesis. Alkylated phenanthrene maturity index as environment indicators in rock extracts has also been discussed in this paper, showing that l-methly phenanthrene and 9-methyl phenanthrene are affected by environment. Factor analysis indicates predominant geological factors affecting formation of polycyclic aromatic hydrocarbon are pyrolytical and combustion pfocess, depositional environment, maturity and early diagenesis, some geological factors may be recognized by means of feature of polycyclic aromatic hydrocarbon associations.