Understanding the occurrences of different fractions of organic matter in shale reservoirs is very important for the evaluation of shale oil. Lacustrine organic-rich shale samples from the first member of the Cretaceous Qingshankou Formation in the Songliao Basin were analyzed with confocal laser scanning microscopy (CLSM) and fluorescence spectral analysis. The results show that the occurrences of different organic components are related to the fabric of samples and vary with depth. The bulk content of light components is significantly higher than heavy components and exhibits a positive relationship with quartz and feldspar contents. Both light and heavy components are distributed parallel with the lamination in microscopic view in laminated samples, and randomly in massive samples. The maximum radius of light components in most of the samples is larger than 20 µm, while it is smaller for heavy components, indicating the micro fractionation from clay/organic lamina to quartz/feldspar lamina. The depth of enrichment of light components corresponds to the oil maturity of organic matter. Both the distribution of light and heavy components fits the same fractal model, with fractal dimensions ranging between 2.2 and 2.5. The CLSM results confirm that it can be a reliable tool for the “sweet spot” exploration.

理解页岩储层中不同有机质组分的存在对评估页岩油非常重要。用共聚焦激光扫描显微镜（CLSM）和荧光光谱分析法分析了松辽盆地白垩纪青山口组第一段富含Lacustrine有机质的页岩样品。结果表明，不同有机成分的出现与样品的结构有关，并随深度的变化而变化。轻组分的体积含量明显高于重组分，并且与石英和长石含量呈正相关。在层压样品中，轻组分和重组分在微观视图中均与层压平行分布，而在大块样品中则随机分布。在大多数样品中，轻组分的最大半径大于20 µm，重组分的最大半径较小，表明从粘土/有机薄片到石英/长石薄片的微分馏。轻组分的富集深度对应于有机物的油成熟度。轻组分和重组分的分布都符合相同的分形模型，分形维数在2.2到2.5之间。CLSM的结果证实，它可以成为“最佳位置”勘探的可靠工具。分形尺寸在2.2到2.5之间。CLSM的结果证实，它可以成为“最佳位置”勘探的可靠工具。分形尺寸在2.2到2.5之间。CLSM的结果证实，它可以成为“最佳位置”勘探的可靠工具。