下寺湾油田龙咀沟地区三叠系长2油藏油气富集规律

Hydrocarbon enrichment law of Triassic Chang 2 oil reservoir set in Longzuigou area of Xiasiwan Oilfield,Ordos Basin

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.