| 北羌塘盆地不同地区中-下侏罗统油页岩地球化学特征对比及意义 |
| 投稿时间：2024-05-22 修订日期：2024-11-14 点此下载全文 |
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| 基金项目:羌塘盆地重点地区选区评价研究,项目编号：JKY202301；羌塘盆地阿木错凹陷油气地质调查。项目编号：DD20221855。 |
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| 中文摘要:目前在北羌塘盆地西长梁、长蛇山及胜利河地区发现了大套中-下侏罗统油页岩,这些油页岩的地球化学特征差异及控制因素还尚未明确。本研究对西长梁、长蛇山及胜利河地区油页岩样品采用总有机碳、抽提分离和气相色谱-质谱联用等技术分析油页岩有机质丰度、类型、成熟度及饱和烃、芳烃类化合物地球化学特征。研究表明：三个地区的油页岩中姥植比、伽马蜡烷指数、芴系列化合物、烷基二苯并噻吩、烷基二苯并呋喃系列化合物分布特征具有一定差异,指示胜利河地区油页岩沉积环境的还原性最强盐度最高、西长梁油页岩次之、长蛇山油页岩沉积环境还原性相对最弱、盐度最低；根据三环萜烷、规则甾烷分布特征及甾藿比,指示了胜利河地区油页岩有机质来源以低等水生生物为主,西长梁地区油页岩有机质来源以低等水生生物输入为主,并有混源特征,长蛇山地区油页岩有机质来源以混源为主；利用甾烷、烷基萘、烷基菲系列化合物等成熟度参数综合研究发现西长梁地区油页岩达到低成熟阶段,胜利河及长蛇山地区油页均已达到成熟-高成熟阶段。综合分析认为,胜利河地区油页岩生油潜力最大,是未来勘探的主要目标。 |
| 中文关键词:北羌塘盆地、油页岩、生物标志化合物、母质来源、沉积环境、成熟度 |
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| Comparison and significance of geochemical characteristics of Middle-Lower Jurassic oil shales in different regions of the North Qiangtang Basin |
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| Abstract:At present, large sets of middle-lower Jurassic oil shales have been discovered in the Xichangliang, Changshe mountain and Shengli River areas of the North Qiangtang Basin, and the differences of geochemical characteristics and controlling factors of these oil shales have not been clarified. The present study employed total organic carbon analysis, extraction and separation techniques, as well as gas chromatography-mass spectrometry, to investigate the abundance, composition, maturity of organic matter, and geochemical characteristics of saturated hydrocarbons and aromatic compounds in oil shale samples collected from Xichangliang, Changshe mountain, and Shengli River areas. The results show that there are some differences in the distribution of plant ratio, gammarecane index, fluorene series compounds, alkyl dibenzothiophene series compounds, alkyl dibenzofuran series compounds, indicating that the sedimentary environment of oil shale in Shengli River area has the highest reduction and highest salinity, followed by Xichangliang oil shale, and Changshe mountain oil shale has the weakest reduction and lowest salinity. According to the distribution characteristics of tricyclic terpenes and regular steranes and the steroidal medium ratio, the organic matter sources of oil shale in Shengli River area are mainly lower aquatic organisms, the organic matter sources of oil shale in Xichangliang area are mainly lower aquatic organisms and have mixed sources, and the organic matter sources of oil shale in Changshe mountain area are mainly mixed sources. Using steranes, alkyl naphthalene, alkyl phenanthrene and other maturity parameters, it is found that the oil shale in the Xichangliang area has reached the low maturity stage, and the oil page in Shengli River and Changshe mountain area has reached the mature to high maturity stage. Comprehensive analysis shows that oil shale in Shengli River area has the greatest potential for oil generation and is the main target of future exploration. |
| keywords:North Qiangtang Basin Oil shales Biomarkers Origin of parent material Sedimentary environment Maturity |
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