克拉玛依原油中的类胡萝卜烷及其地球化学特征

PERHYDRO CAROTENES IN KARAMAY CRUDE OIL AND THEIR GEOCHEMICAL CHARACTERISTICS

蒋助生

Jiang Zhusheng

气相色谱-质谱分析结果表明,克拉玛依原油中的类异戊二烯烷烃、甾烷、萜烷等生物标志化合物十分丰富。特别使人感兴趣的是,在这些原油中普遍存在β胡萝卜烷,个别样品的β胡萝卜烷含量高达30%以上(按峰面积归一化计算),这的确是极不寻常的。

Analyses of gas chromatography/mass spectrometry show that β-carotane and its homologues are quite rich and ubiquitous in Karamay crude oil,with β-carotane contained in a few samples more than 30%. Such bio-mark compounds which have important significance in geology,may result from algae rich in carotenes.Since almost all β-carotane can be transformed through thermodegradation into homologues with low molecular weight at a greater extent,as compared with the transformation of stereoisomers of steroids and terpenoids,its relative abundance thus can be considered as a more effective index for thermal evolution.The ratio of γ-carotane to β-carotane may also be an important index. The γ/β ratio increases with thermal evolution and decreases with biodegradation.

10.11743/ogg19830203