渤海湾盆地车镇凹陷下古生界烃源岩生物标志物特征

林红梅

doi:10.11781/sysydz201702230

渤海湾盆地车镇凹陷下古生界烃源岩生物标志物特征

doi: 10.11781/sysydz201702230

林红梅^1,2

1.
中国石油大学(华东) 地球科学与技术学院, 山东青岛 266580
2. 中国石化胜利油田分公司勘探开发研究院, 山东东营 257015

基金项目: 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。

详细信息

作者简介:
林红梅(1969-),女,在读博士研究生,高级工程师,从事石油地质勘探研究。E-mail:sllinhm@126.com。

中图分类号: TE122.113
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出版历程
- 收稿日期: 2016-08-23
- 修回日期: 2017-01-20
- 刊出日期: 2017-03-28

Biomarker characteristics of Lower Paleozoic source rocks in Chezhen Sag, Bohai Bay Basin

Lin Hongmei^1,2

1.
College of Geoscience and Technology, China University of Petroleum, Qingdao, Shandong 266580, China
2. Institute of Geological Science, SINOPEC Shengli Oilfield Company, Dongying, Shandong 257015, China

摘要

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。
- 生物标志物 /
- 碳酸盐岩 /
- 下古生界 /
- 车镇凹陷,渤海湾盆地
Abstract: The biomarkers of the Lower Paleozoic carbonate rocks in the Chenzhen Sag of Bohai Bay Basin were stu-died using GS-MS. Their sedimentary environment, organic matter origin and thermal evolution degree were discussed, and compared them with the Eogene source rocks. The normal alkanes showed a single-peak distribution, with the main peak carbon varying between n-C₁₆ and n-C₁₈. Odd/even carbon number preference was not obvious, and Pr/Ph ratio ranged from 0.37 to 1.2, showing a weak phytane dominance or a balance between pristane and phytane. Hopane was the main terpane compound, with low tricyclic terpanes, high tetracyclic terpane, normal homohopane and low gammacerane contents. The C₂₇, C₂₈, C₂₉ regular steranes showed an asymmetrical "V" type distribution, with low rearranged sterane and high 4-methyl rearranged sterane contents. Phenanthrene and tris-fluorene series were the main aromatic compounds, lack of biphenyl and other higher plant imported biomarkers. The naphthalene series was abundant while 1,2,5-trimethylnaphthalene and 1,2,5,6-tetramethylnaphthalene had a low abundance. Dibenzothiophenes were rich and dibenzofurans were poor. Aromatic steranes were mainly triaryl steranes, and mono-aromatic steranes were absent. These biomarkers indicated that the Lower Paleozoic source rocks were deposited in a reductive shallow sea environment, mainly originated from fungus, algae and lower aquatic plankton, and were highly mature and over-mature. Four saturated hydrocarbon biomarkers and five aromatic hydrocarbon biomarkers were chosen to distinguish source rocks in the Lower Paleozoic and the Eogene, which provided evidence for oil and source correlation.
- biomarker /
- carbonate source rock /
- Lower Paleozoic /
- Chezhen Sag

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