基于大量钻井、测井、录井及试油资料，结合岩心观察和薄片鉴定，对下寺湾油田龙咀沟地区长2 油 藏的油气富集规律及主控因素进行了研究。结果表明：下寺湾油田长2 油藏的形成和富集受沉积相带、 优质储层、鼻状隆起背景、断裂、区域盖层、运移通道等因素的控制。其中，鼻状隆起部位油藏最为富集，裂 缝等垂向运移通道对长2 油藏的形成和分布具有重要控制作用。长2 油藏类型复杂多样，除岩性油藏以 外，构造-岩性油藏也是其主要类型。

Based on the data of well drilling, well logging, geological log and production test, combined with the core observation and thin section analysis, the hydrocarbon enrichment law and its main controlling factors of Chang 2 oil reservoir set in Xiasiwan Oilfield of Ordos Basin were studied. The result shows that the formation and enrichment of Chang 2 oil reservoir set are controlled by sedimentary facies, high quality reservoirs, nose-shaped uplift, fault, areal cap rock and migration pathway in Xiasiwan Oilfield, among which the nose-shaped uplift is the most favorable place for hydrocarbon enrichment. As migration pathways, fractures have significant effects on the formation and distribution of Chang 2 oil reservoir set. Lithologic reservoir and structural-lithologic reservoir are the main types of the Chang 2 oil reservoir set.