中国石油大学（北京）海南研究院李美俊团队研究了芴及其甲基化同系物碳同位素组成在沉积有机质来源和沉积环境中的应用。相关论文于2025年6月17日发表在《地球化学学报》杂志上。

沉积有机质（OM）和油中单个多环芳烃（PAC）的碳同位素组成（δ¹³C）分析在有机地球化学中越来越重要，因为它提供了OM来源、热成熟度和次生蚀变的信息。课题组研究了不同沉积环境（湖相页岩、海相页岩、海相碳酸盐和陆相煤）的煤提取物和原油中芴（Flu）及其甲基化同系物的δ¹³C值。结果表明，Flu和1-甲基芴（1-MF）的δ¹³C值主要受OM来源的影响，与热成熟度关系不大，这表明沉积环境多种多样。Flu和1-MF的δ¹³C值与正庚烷/植酸比（Pr/Ph）的两个交叉图用于研究沉积环境和有机质来源的影响。

这些交叉图将研究样本分为五个环境/源区：海洋、藻类；湖泊，藻类细菌混合；三角洲/湖泊/海岸，混合和水生为主；过渡（海洋和陆地），混合和陆源为主；以及陆源煤炭。不同沉积环境和来源的样品是可区分的，特别是具有相似古环境的海相和过渡相的样品。这些结果为区分来自不同来源、不同海洋和陆地输入水平的OM提供了有用的工具。

附：英文原文

Title: The application of carbon isotope compositions of fluorene and its methylated homologues in the sources and depositional environments of sedimentary organic matter

Author: Geng, Ziao, Li, Meijun, Zhang, Shuichang, Shi, Shengbao, Zhu, Lei, Li, Tiantian, Zhang, Jianfeng

Issue&Volume: 2025-06-17

Abstract: Analysis of the carbon isotope composition (δ13C) of individual polycyclic aromatic compounds (PACs) in sedimentary organic matter (OM) and oils is increasingly important in organic geochemistry, as it provides information on OM sources, thermal maturity, and secondary alteration. In this study, the δ13C values of fluorene (Flu) and its methylated homologues were investigated in coal extracts and crude oils from various depositional environments (lacustrine shale, marine shale, marine carbonate, and terrestrial coal). The results show that the δ13C values of Flu and 1-methylfluorene (1-MF) are primarily affected by the origin of OM and are less related to thermal maturity, which indicates a variety of depositional environments. Two cross-plots of the δ13C values for Flu and 1-MF versus the pristane/phytane ratio (Pr/Ph) are used to investigate the effects of the depositional environments and sources of OM. These cross-plots classify the study samples into five environmental/source zones: marine, algae; lacustrine, algae-bacterial mixed; deltaic/lacustrine/coastal, mixed and aquatic-dominated; transitional (marine and terrestrial), mixed and terrigenous-dominated; and coal, terrigenous. The samples from the various depositional environments and sources are distinguishable, particularly those of marine and transitional facies with similar paleoenvironments. The results provide useful tools to discriminate between OM derived from different sources with different levels of marine and terrestrial input.

DOI: 10.1007/s11631-025-00790-x

Source: https://link.springer.com/article/10.1007/s11631-025-00790-x