By conducting experimental analyses, including thermal pyrolysis, micro-/nano-CT, argon-ion polishing field emission scanning electron microscopy (FE-SEM), confocal laser scanning microscopy (CLSM), and two-dimensional nuclear magnetic resonance (2D NMR), the Gulong shale oil in the Songliao Basin was investigated with respect to formation model, pore structure and accumulation mechanism. First, in the Gulong shale, there are a large number of pico-algae, nano-algae and dinoflagellates, which were formed in brackish water environment and constituted the hydrogen-rich oil source materials of shale. Second, most of the oil-generating materials of the Qingshankou Formation shale exist in the form of organo-clay complex. During organic matter thermal evolution, clay minerals had double effects of suppression and catalytic hydrogenation, which expanded shale oil window and increased light hydrocarbon yield. Third, the formation of storage space in the Gulong Shale was related to dissolution and hydrocarbon generation. With the diagenesis, micro-/nano-pores increased, pore diameter decreased and more bedding fractures appeared, which jointly gave rise to the unique reservoir with dual media (i.e. nano-scale pores and micro-scale bedding fractures) in the Gulong shale. Fourth, the micro-/nano-scale oil storage unit in the Gulong shale exhibits independent oil/gas occurrence phase, and shows that all-size pores contain oils, which occur in condensate state in micropores or in oil-gas two phase (or liquid) state in macropores/mesopores. The understanding about Gulong shale oil formation and accumulation mechanism has theoretical and practical significance for advancing continental shale oil exploration in China.

通过进行实验分析，包括热解、微/纳米CT、氩离子抛光场发射扫描电子显微镜（FE-SEM）、共焦激光扫描显微镜（CLSM）和二维核磁共振（2D NMR）对松辽盆地古龙页岩油形成模式、孔隙结构及成藏机制进行了研究。首先，古龙页岩中存在大量的皮藻、纳米藻和甲藻，它们形成于微咸水环境中，构成了页岩的富氢油源物质。其次，青山口组页岩的生油物质大部分以有机粘土复合体的形式存在。在有机质热演化过程中，粘土矿物具有抑制和催化加氢的双重作用，扩大了页岩油窗口，提高了轻烃产率。第三，古龙页岩储集空间的形成与溶蚀、生烃有关。随着成岩作用的进行，微纳米孔隙增多，孔径减小，层理裂缝增多，共同形成了古龙页岩独特的纳米级孔隙和微米级层理裂缝双介质储集层。第四，古龙页岩微纳米级储油单元表现出独立的油气赋存相，表明全尺寸孔隙均含油，石油以微孔凝析状态或油气两相（或大孔/中孔中的液体）状态。认识古龙页岩油成藏机制对于推进我国陆相页岩油勘探具有理论和现实意义。