新疆准噶尔盆地南缘二叠系芦草沟组烃源岩生物标志化合物特征及意义

发布时间：2018-06-15 23:49

本文选题：准噶尔盆地南缘 + 芦草沟组　；参考：《地质通报》2017年Z1期

【摘要】：通过地球化学分析测试技术对准噶尔盆地南缘芦草沟组烃源岩生物标志化合物特征进行研究,探讨其有机质的母质来源、沉积环境、有机质演化程度等方面的信息。芦草沟组烃源岩正构烷烃的轻碳优势和甾烷的C_(27-29)含量关系等参数表明,母质来源主要为藻类等低等水生生物。平均1.0左右的烃源岩Pr/Ph值表明,弱氧化-弱还原的沉积环境,平均值为0.15的伽马蜡烷指数及较高含量的孕甾烷和升孕甾烷表明,沉积环境盐度较高,该沉积环境有利于有机质的富集。对甾烷的C_(29)20S(20S+20R)和C_(29)αββ/(αββ+ααα)值和C_(31)藿烷αβ22S/(22S+22R)值等成熟度参数进行分析表明,研究区烃源岩处于低成熟-成熟阶段。烃源岩有机质中四环萜烷的出现及较小的规则甾烷/17α(H)-藿烷比值等参数表明,烃源岩成岩早期有机质受到一定程度的生物降解作用。
[Abstract]:The characteristics of source rock biomarkers of Lucaogou formation in the southern margin of Junggar Basin were studied by geochemical analysis and test technique. The information of organic matter source material, sedimentary environment and evolution degree of organic matter were discussed. The relationship between the light carbon dominance of normal alkanes in the source rocks of Luchaogou formation and the C _ (27-29) content of steranes shows that the source material is mainly from algae and other low aquatic organisms. The average Pr-Ph value of source rock about 1.0 indicates that the sedimentary environment with weak oxidation-weak reduction, the gamma-waxane index with an average of 0.15 and the higher contents of pregnane and ascending sterane indicate that the sedimentary environment has higher salinity. The sedimentary environment is conducive to the enrichment of organic matter. Based on the analysis of the maturity parameters of C _ S _ 2920S _ (20S _ (20R) and C _ s _ (29) 伪尾 _ 尾 _ (伪尾 _ 伪) _ 伪 _ 尾 _ (伪 _ 尾 _ 伪) _ 伪 _ 尾 _ 尾 _ (22S ~ (22) S _ (22R) value of C _ S _ (31), it is found that the source rocks in the study area are in low maturation and maturation stage. The occurrence of tetracyclic terpene in organic matter of source rock and the smaller ratio of regular steroid / 17 伪 -hali-cariane indicate that the organic matter in the early diagenetic stage of the source rock was biodegraded to a certain extent.
【作者单位】：山东科技大学地球科学与工程学院;大陆动力学国家重点实验室/西北大学地质系;中国地质调查局青岛海洋地质研究所;
【基金】：国家自然科学基金项目《半地堑陆相沉积的解剖及地层分析和对比方法》(批准号:41428201)
【分类号】：P534.46;P618.13

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