济阳坳陷古近纪沟鞭藻分子化石的分布与控制因素

永颉同心

摘　要：济阳坳陷古近纪沟鞭藻化石十分丰富,沟鞭藻为有机质富集层的形成作出了重要贡献.三芳甲藻甾烷和甲藻甾烷是沟鞭藻及其祖先在古代沉积物中两种重要的存在形式,并且它们几乎专一性地由沟鞭藻提供.研究发现,沟鞭藻的不同属种,德弗兰藻属、多刺甲藻属、渤海藻类等,均可以提供丰富的三芳甲藻甾烷和甲藻甾烷,但是三芳甲藻甾烷和甲藻甾烷对沉积环境的变化具有不同的响应.在淡水、半咸水、咸水等不同水介质条件下,三芳甲藻甾烷指数稳定分布在0.50～0.96之间,高丰度的三芳甲藻甾烷与地层中丰富的沟鞭藻化石相一致,因而三芳甲藻甾烷是指示沟鞭藻输入的有效分子化石.甲藻甾烷的丰度与古沉积环境存在密切关系,高盐环境有利于甲藻甾烷的形成和保存,随着盐度的降低甲藻甾烷指数在0.04～0.74这样一个较大的范围内变化,其发育程度与有机质沉降过程中和成岩作用早期遭受的微生物降解作用有关,强烈的生物降解不利于甲藻甾烷的保存.
关键词：三芳甲藻甾烷;甲藻甾烷;沟鞭藻;分子化石;沉积环境;古近纪

基金项目：国家自然科学基金项目(批准号:40703011)资助
作者简介：王广利 男 1973年出生 博士 讲师 有机地球化学
作者单位：王广利（中国石油大学教育部油气成藏机理重点实验室,北京,102249）　
　　　　　王铁冠（中国石油大学教育部油气成藏机理重点实验室,北京,102249）　
　　　　　陈致林（中国石化胜利油田分公司地质科学研究院,山东东营,257015）　
　　　　　张林晔（中国石化胜利油田分公司地质科学研究院,山东东营,257015）　
　　　　　徐金鲤（中国石化胜利油田分公司地质科学研究院,山东东营,257015）　
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