| 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 |
| |
| 关键词:North Qiangtang Basin oil shales biomarkers origin of parent material sedimentary environment maturity |
| 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) |
|
| 摘要点击次数: 86 |
| 全文下载次数: 39 |
| 摘要: |
| Comparison and Significance of Geochemical Characteristics of Middle–Lower Jurassic Oil Shales in Different Regions of the North Qiangtang Basin |
| 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. |
| YANG Yizhuo,HUANG Zhilong,FENG Weiping,QU Tong,ZHAO Zhen,ZHANG Lili,PAN Yongshuai.2025.Comparison and Significance of Geochemical Characteristics of Middle–Lower Jurassic Oil Shales in Different Regions of the North Qiangtang Basin[J].Acta Geoscientica Sinica,46(3):602-614. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|