我国第三系咸化湖相有机质组成及环境意义

针对中国新生代第三系广泛分布的咸化湖相盆地的成因及地球化学环境意义 ,比较系统地分析了中国新生界咸化湖相地层生油岩及原油中饱和烃、芳香烃等化合物的地球化学特征 .分析结果表明 :咸化湖地层中有机质的地球化学 (生物标志物组合 )特征 ,既不同于淡水湖相地层中的有机质 ,又与海相地层中的有机质存在明显的差别 .进一步讨论了造成这一现象的地球化学成因及其环境地球化学意义 ,并对其中部分生物标志物及稳定碳同位素组成特征的指相意义作了探讨 .通过生物标志物的组合特征和环境地球化学意义分析 ,初步认为中国新生代第三系咸化湖盆咸化湖泊的形成与海浸作用没有直接的联系 .

Geochemical Characteristic and Environment of Organic Matter of Saline Lakes in Tertiary, China

Salified lakes are widely distributed in Tertiary strata in China. There is unique geochemical characteristic and biomarker assemblage in the oils and source rocks from these saline lakes. The geochemical characteristic of saturated hydrocarbon and aromatic hydrocarbon in source rocks and oils of Tertiary salified lakes in China are analyzed in this paper. The analysis result shows that the biomarker assemblage characteristic of organic matter in Salified lakes is different from those of organic matter in fresh-water lake or in marine. The environmental geochemistry signification of some biomarkers assemblage characteristic in these organic matter are discussed in this paper. Some problems about several compositions used to distinguish marine facies from nonmarine facies are also discussed in the paper. Based on the biomarker assemblage characteristic, there is not connection between the formation of Salified lakes distributed in Tertiary strata of China and the transgression.