| 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 |
| 点此下载全文 |
| 引用本文：杨易卓,黄志龙,冯伟平,屈童,赵珍,张莉莉,潘永帅.2025.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[J].地球学报,46(3):602-614. |
| DOI：10.3975/cagsb.2024.111513 |
| 摘要点击次数: 47 |
| 全文下载次数: 23 |
|
| 基金项目:中国地质科学院基本科研业务费项目“羌塘盆地重点地区选区评价研究”(编号: JKY202301)和中国地质调查局地质调查项目“羌塘盆地阿木错凹陷油气地质调查”(编号: DD20221855) |
|
| 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 |
| |
| Comparison and Significance of Geochemical Characteristics of Middle–Lower Jurassic Oil Shales in Different Regions of the North Qiangtang Basin |
|
|
| Abstract:Large sets of Middle–Lower Jurassic oil shales have been discovered in Xichangliang, Changsheshan and Shenglihe areas of the North Qiangtang Basin, but the differences in the geochemical characteristics and factors controlling these oil shales remain clarified. In the present study, we employed total organic carbon analysis, extraction and separation techniques, as well as gas chromatography-mass spectrometry, to inves-tigate the abundance, composition, maturity of organic matter, and geochemical characteristics of saturated hydrocarbons and aromatic compounds in oil shale samples collected from Xichangliang, Changsheshan, and Shenglihe areas. The results showed that there were some differences in the distribution of plant ratio, gammarecane index, fluorene series compounds, alkyl dibenzothiophene series compounds, and alkyl dibenzofuran series compounds, indicating that the sedimentary environment of oil shale in Shenglihe area had the highest reduction and highest salinity, followed by the Xichangliang oil shale, and Changsheshan oil shale had the weakest reduction and lowest salinity. According to the distribution characteristics of tri-cyclic terpenes and regular steranes and the steroidal medium ratio, the organic matter sources of oil shale in Shengliher area were mainly lower aquatic organisms, the organic matter sources of oil shale in Xichangliang area were mainly lower aquatic organisms with mixed sources, and the organic matter sources of oil shale in Changsheshan area were mainly mixed sources. Using steranes, alkyl naphthalene, alkyl phenanthrene and other maturity parameters, we found that the oil shale in the Xichangliang area reached the low maturity stage, and the oil page in Shenglihe and Changsheshan area reached the mature to high maturity stage. A comprehensive analysis shows that the oil shale in Shenglihe area has the greatest poten-tial 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 |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|
