蟠龙油田三叠系长2油组油气富集规律

鄂尔多斯盆地陕北斜坡为一平缓的西倾单斜，通常认为长2油藏的形成和分布主要受沉积相和优质储层控制，构造、裂缝等其他地质因素作用较弱。对陕北斜坡东部蟠龙油田长2油层组油气富集主控因素的研究表明，蟠龙油田长2油藏的形成和富集受沉积相带和优质储层、鼻状隆起背景、区域盖层与局部盖层、运移通道等多种因素控制，其中，鼻状隆起与局部盖层对长2油藏意义更为突出，鼻状隆起的围斜部位油藏最为富集，而局部盖层拓展了油层纵向分布范围。长2油藏类型复杂多样，除岩性油藏以外，以构造-岩性为主的复合油藏是该区长2油藏的主要类型。

PETROLEUM ACCUMULATION AND DISTRIBUTION LAW OF CHANG 2 FORMATION IN PANLONG OILFIELD ORDOS BASIN

The formation and distribution of Chang 2 accumulations in Yanchang Formation in the North Shanxi Slope are considered to be controlled by sedimentary facies and high quality reservoir.Other geological factors such as structure and fracture have a relatively weak effect on the formation of reservoir.The present study shows that the formation and enrichment of Chang 2 reservoir are subject to multiple factors such as:sedimentary facies,high quality reservoirs,the background of noseshaped uplift，regional seal,local seal and migration pathway etc in Panlong Oilfield,among which the nose shaped uplift and local cap rocks are the most important conditions for the formation and enrichment of Chang 2 reservoir because the periclinal structure of nose shaped uplift is rich in hydrocarbon reservoirs and the local cap rocks expand the longitudinal distribution range of oil.Besides lithologic accumulations,structure lithologic composite accumulations are the main types of the Chang 2 accumulations．