新苯基烷烃系列的色谱质谱特征及地球化学意义

Identification and Geochemistry of a Novel Phenyl Alkane Series

首次在下扬子盆地黄桥地区钻井揭示的下古生界至前寒武系高演化烃源岩饱和烃馏分中，检测到一个新的单环芳烃系列──苯基烷烃，其碳数范围为Ｃ１５～Ｃ２１，呈单峰态分布，主峰一般为Ｃ１８，且常以６个同分异构体成群出现，根据其质谱特征可确定苯基的取代位置。鉴于这类化合物目前仅检测于早古生代及更老的沉积记录中，其生物来源可能与当时较为繁盛的浮游植物如蓝绿藻、绿藻及凝源类密切相关，故它们能指示浮游植物的生源输入，其地质分布不受有机质成熟度的影响。

A novel monocyclic aromatics series, that is, phenyl alkane series with 6 isomers for every carbon number, has been identified in the saturate fraction of theLower Paleozoic and Pre-Cambrian rock extracts from the Huangqiao area of LowerYangtz Basin. The range of carbon number about this series is between C-15 and C-21, the main peak is C-18. According to their mass spectra, the position at which phenyl group is substituted could been determined. Considering that this series is identified only in the Lower Paleozoic and much older sedimentary records with an input of photoplankton such as blue-alga and green alga, the phenyl alkane series could been used as an indicator of the photoplankton input, and its distribution is not influenced by the maturity of organic matter.