油页岩纹层中古环境信息重建及毫米级有机质富集机理研究

油页岩是有机质丰度高的细粒沉积岩，并广泛发育纹层，可供我们同时研究古环境信息和有机质富集机理两大重要科学问题。本课题选择中国东北松辽盆地（中生代）、抚顺盆地和桦甸盆地（均为新生代始新世）纹层发育的油页岩为研究对象，旨在揭示纹层中蕴含的东北亚古环境信息和毫米级有机质富集机理。主要研究手段包括纹层显微观察和精细刻画、无机元素微区分析、单纹层生物标志化合物和稳定同位素分析，微体古生物鉴定。主要目标是（1）识别油页岩纹层组合类型，分析各层矿物学特征，（2）获取微区或单纹层中元素和同位素地球化学参数，（3）利用有机生物标记化合物分析有机质类型和来源，（4）建立连续的湖泊年纹浮动时间序列和古气候、水体盐度、含氧性、沉积速率、古湖泊生产力等信息的高分辨率垂向变化序列，（5）揭示毫米尺度内制约有机质富集的“短板”因素。课题将丰富东北亚关键时段的古环境记录，并且总结毫米级有机质富集机理，深化油页岩成矿理论。

Oil shale is a fine-grained, commonly laminated sedimentary rock that has high organic content, which is an excellent rock type for advancing two important scientific topics: high-resolution palaeoenvironmentalrecord and mechanisms oforganic enrichment. This project targets the high-quality oil shale layers in the Songliao basin(Mesozoic), Fushun and Huadian basins (both Eocene, Cenozoic)innortheastern China. It will provide palaeoenvironmental reconstructions for these critical time intervals in northeastern Asia and enhanced understanding of organic enrichment at amillimetre scale. Majormethods include high-magnificationpetrographic microscopic observation and laminacharacterization, in situmajor and trace element analysis,single-layer biomarker and stable isotope analysis, and micropalaeontology. The main objectives are (1) mineral assembly and sedimentary structures of laminae in oil shale, (2) high-resolution, single-layer geochemical and stable isotopic characterizations of oil shale sections, (3) types and origins of biomarkers and organic matters at the single-layer scale, (4) high-resolutiontime series of key palaeoenvironmental parameters including water salinity, oxygen content, sedimentation rate, and palaeo-lake productivity, and (5) the revealing of controlling factors on organic enrichment. Thisproject will enrich the knowledge of palaeoenvironmental change in northeastern Asia and advance models of organic enrichment, leading to new understanding ofoil shale formation.