地球学报2025，Vol.46Issue(3)：602-614,13.DOI:10.3975/cagsb.2024.111513
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
Comparison and Significance of Geochemical Characteristics of Middle-Lower Jurassic Oil Shales in Different Regions of the North Qiangtang Basin
摘要
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 investigate 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 tricyclic 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 potential for oil generation and is the main target of future exploration.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Key words
North Qiangtang Basin/oil shales/biomarkers/origin of parent material/sedimentary environment/maturity分类
地质学引用本文复制引用
杨易卓,黄志龙,冯伟平,屈童,赵珍,张莉莉,潘永帅..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,2025,46(3):602-614,13.基金项目
本文由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)联合资助. This study was supported by Central Pub-lic-interest Scientific Institution Basal Research Fund(No.JKY202301),and China Geological Sur-vey(No.DD20221855). （编号:JKY202301）
