对中国苏北盆地溱潼凹陷古近系阜宁组阜二段（Ef₂）泥页岩储层的含油性特征进行了深入探讨。溱潼凹陷作为典型的南断北超箕状断陷构造，其丰富的页岩油资源具有极高的勘探价值。采用电子探针、X射线衍射、氩离子抛光-扫描电镜、热解分析及激光共聚焦显微镜等先进技术，对来自溱页1井（QY1）与溱页3井（QY3）的泥页岩样品进行了深入分析。研究发现，阜二段泥页岩矿物组成复杂，孔隙结构以纳米尺度微孔为主，形成错综复杂的孔隙网络。在含油性特征方面，研究结果显示，Ⅰ亚段和Ⅱ亚段的泥页岩含油性明显更为优越，相较于Ⅲ亚段和Ⅳ亚段具有更高的含油潜力。进一步分析发现，页岩油中轻质组分与重质组分的分布不仅受到矿物组分的影响，还与埋藏深度密切相关。此外，页岩油的赋存位置受成熟度影响显著，高成熟度样品中页岩油主要富集于长英质／灰质纹层，而低成熟度样品中则主要储集于泥质纹层。本研究明确了中高成熟度泥页岩中长英质纹层是页岩油的主要赋存空间，为溱潼凹陷页岩油资源的勘探与开发提供了重要理论依据。

The shale samples were collected from QY1 and QY3 wells in the second member of the Paleogene Funing Formation of the Qintong Sag, Subei Basin, China, to investigate the oil-bearing characteristics of the shale series. The samples were subjected to comprehensive analysis using techniques such as electron microprobe, X-ray diffraction, argon-ion polishing coupled with scanning electron microscopy, pyrolysis analysis, and confocal laser scanning microscopy. It is found that the mineral composition of the shale in the second member of the Fu-formation is notably complex. The pore structure is predominantly comprised of nano-scale micropores, forming an intricate pore network. The results indicate that subsections Ⅰ and Ⅱ exhibit markedly higher oil contents and greater oil potential than subsections Ⅲ and Ⅳ. Further analysis shows that the distribution of light and heavy components within the shale oil is influenced not only by the mineral composition but also closely correlated with burial depth. Additionally, the occurrence of shale oil is significantly impacted by the level of maturity. Shale oil is primarily concentrated within felsic/gray striations in high maturity samples, while it is mainly stored within muddy striations in low maturity samples. It is established that shale oil predominantly occurs in shales with medium to high maturity. These findings provide a crucial theoretical foundation for the exploration and development of shale oil resources in the Qintong Sag.