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沉积学报  2015 

松辽盆地后金沟剖面烃源岩地球化学特征及其古环境重建

DOI: 10.14027/j.cnki.cjxb.2015.05.020, PP. 1043-1052

Keywords: 松辽盆地,嫩江组,碳同位素,正构烷烃,C30甾烷

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Abstract:

通过对晚白垩纪松辽盆地后金沟剖面不同类型烃源岩进行详细的有机地球化学分析,揭示嫩江组一段上部到二段下部的烃源岩有机地球化学特征及古环境意义。根据元素分析、Rock-Eval及生物标志化合物等参数,发现嫩江组一段上部随着埋深的减少,有机质的来源以湖泊内源和陆生高等植物混合为主逐渐向以湖泊内源占优势过渡;正构烷烃分布呈现出高碳数的奇偶优势与低碳数偶奇优势共存、高碳数的奇偶优势、低碳数的偶奇优势三种模式;δ13Corg、C/N及海相C30甾烷共同证实了海侵作用的发生,且24-正丙基-胆甾烷、24-异丙基-胆甾烷和甲藻甾烷含量分别为0.09~8μg/g、0~2μg/g、0~0.3μg/g,随着埋深的减少呈现增加趋势。嫩江组二段下部有机质来源以湖泊内源占优势,且非海相藻类对长链正构烷烃有一定的贡献,有机质的保存与缺氧环境和微生物的活动均有关;24-正丙基-胆甾烷、24-异丙基-胆甾烷和甲藻甾烷的含量分别为2.8~12.5μg/g、2.4~8.5μg/g、0.1~0.64μg/g,随埋深减少呈现一定波动性。因此认为嫩江组一段上部沉积环境总体表现为滨湖到浅湖相的过渡并且伴随海侵作用逐渐增强;嫩江组二段下部被证明是半深湖到深湖相的沉积类型,海相C30甾烷含量的波动变化指示了海侵的多期次。

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