Due to many influencing factors such as multiple material sources, the physical properties of the reservoir , the buried depth of structures and so forth, Putaohua oil reservoirs in South Gulong Sag possess the following characteristics: low porosity, low permeability, low oil saturation, various oil reservoir types and complicated oil-water distribution relation. Through the fine and deep analyses of the distribution of petroleum reservoir formation, oil and water distribution and those discovered petroleum reservoirs, 3 types of petroleum reservoir-forming models are established; structural-lithological, fault-lithological complex and lithological models. The results show that the petroleum accumulation in the study area is mainly controlled by sedimentary facieses and belts, structural positions , physical properties of reservoirs and so on; the nose-like structure developed along the edges of the sag for quite a long time is the oriented region of large-scale oil and gas migrations, so it becomes the place where the petroleum is most favorably accumulated and formed; the oil and gas on the slope are generally enriched in the sedimentary bells developed in sand bars and sand sheets, the lithological petroleum reservoirs with updip pinchout and fault-lithological petroleum reservoirs {the faults mainly play a role of barrier) can be principally found out; the hydrocarbon in the anticline area is generally accumulated in the sedimentary facieses and belts developed in distributary channel sand and sand bars, high-productivity and "Sweet Point" type accumulated lens-like lithological oil reservoirs and fault-lithological complex oil reservoirs can be mainly searched out.%由于受多物源、储层物性、构造埋深等多因素影响,松辽盆地古龙凹陷南部葡萄花油层具有低孔渗、低含油饱和度、油藏类型多样和油水分布关系复杂的特点.通过深入分析该区油气成藏分布、油水分布和已发现油气藏的精细解剖,建立了油气成藏的3种模式:构造—岩性油气藏模式、断层—岩性复合油气藏模式和岩性油气藏模式.结果表明,研究区油气富集主要受沉积相带、构造部位、储层物性等因素控制；凹陷周边长期发育的鼻状构造部位是油气大规模运移的指向区,最有利于油气富集成藏；斜坡带油气主要富集在砂坝、席状砂发育的沉积相带内,主要寻找上倾尖灭岩性油气藏和断层—岩性油气藏(断层主要起遮挡作用)；向斜区内油气主要富集在分流河道砂、砂坝发育的沉积相带内,主要以寻找高产富集的“甜点”型的透镜体岩性油藏、断层—岩性复合油藏为主.
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