渤海湾盆地车镇凹陷下古生界烃源岩生物标志物特征

发布时间：2018-06-03 23:11

本文选题：生物标志物 + 碳酸盐岩　；参考：《石油实验地质》2017年02期

【摘要】：利用GC-MS技术对渤海湾盆地车镇凹陷下古生界碳酸盐岩的生物标志物进行研究,探讨了烃源岩沉积环境、有机质来源及热演化程度,对比了其与古近系烃源岩的差异。研究表明:下古生界碳酸盐岩正构烷烃主峰碳数低、奇偶优势不明显,类异构烷烃呈弱植烷优势或姥鲛烷-植烷均势;萜烷类化合物以藿烷为主、三环萜烷含量较低、四环萜烷相对较多,升藿烷系列分布正常,γ-蜡烷含量较低;C27、C28和C29规则甾烷呈不对称的"V"型分布,重排甾烷含量低,4α-甲基甾烷含量较高;芳烃中菲和三芴系列占优势,缺少联苯等高等植物输入的生物标志物,萘系列丰富及1,2,5-三甲基萘、1,2,5,6-四甲基萘丰度低,三芴中硫芴丰度高、氧芴低,芳香甾烷以三芳甾烷为主,缺失单芳甾烷。上述特征指示,下古生界烃源岩形成于还原性浅海环境,源于菌藻类和浮游类低等生物,演化阶段处于高—过成熟阶段。对比优选出了可以区分下古生界与古近系烃源岩的4个饱和烃和5个芳烃生标参数,为该区下古生界油藏的油源判识提供了依据。
[Abstract]:The biomarkers of Lower Paleozoic carbonate rocks in Chezhen Sag, Bohai Bay Basin were studied by using GC-MS technique. The sedimentary environment, source of organic matter and thermal evolution of hydrocarbon source rocks were discussed, and the differences between them and Paleogene source rocks were compared. The results showed that the main peak carbon number of n-alkanes in Lower Paleozoic carbonate rocks was low, but the odd-even dominance was not obvious, the iso-alkanes showed weak phytane dominance or basket-phytane homogeneity, and the terpenes were dominated by hopanes, and the contents of tricyclic terpenes were low. The tetracyclic terpenes are relatively more, and the series of epimedium are normal, the contents of 纬 -paraffin are lower than that of C _ (27) C _ (28) and C _ (29) regular steranes are asymmetric "V" type, the contents of rearranged steranes are lower than those of 4 伪 -methylsteranes, and the phenanthrene and trifluorene series are dominant in aromatics. Lacking of biphenyl and other higher plant biomarkers, naphthalene series is abundant, and the abundance of 1C 2N 5 TME is low, the abundance of thiofluorene is high, the oxygen fluorene is low, the main aromatic sterane is triarosterane, and the monoaryl sterane is absent. The above characteristics indicate that the Lower Paleozoic source rocks were formed in the reductive shallow sea environment and originated from the lower organisms such as algae and plankton and the evolution stage is in the high-over-mature stage. Four saturated hydrocarbons and five aromatics parameters which can distinguish the source rocks of Lower Paleozoic and Paleogene have been selected, which provides a basis for oil source identification of Lower Paleozoic reservoirs in this area.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项“济阳坳陷油气富集机制与增储领域”(2011ZX05006-003)资助
【分类号】：P618.13

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