北海盆地油气成藏特征

为了探讨北海盆地油气成藏特征,对前人在该区的大量研究成果进行了整理和分析,研究结果认为,北海盆地是一个以油为主的裂谷盆地,平面上具有"北油南气"的分布特征;发育多套油气圈闭类型,其中,二叠系镁灰岩统盐岩的分布和早白垩世晚期的反转运动控制了南部盆地的油气圈闭类型,而晚侏罗世—早白垩世的区域拉张运动控制了北部盆地的油气圈闭类型;北海盆地油气成藏类型大致可以划分为"新生古储"和"古生新储",北海南部盆地为"古生新储",北海北部盆地为"新生古储"和"古生新储"兼而有之的复杂的成藏组合类型。

CHARACTERISTICS OF HYDROCARBON ACCUMULATION IN NORTH SEA BASIN

This study is devoted to the characteristics of hydrocarbon accumulation in North Sea Basin. The result shows that North Sea Basin is an oil-bearing rift basin, characterized by the hydrocarbon distribution pattern of "Oil in the North and Gas in the South". There are several types of oil and gas traps in this basin. In the southern basin, the traps are controlled by the evaporite of Zechstein Formation and the late Cretaceous inversion,while traps in the northern basin are affected by regional extension during Late Jurassic-Early Cretaceous. The genetic types of hydrocarbon accumulation can be basically classified as "new source to old reservoir" and "old source to new reservoir" in North Sea Basin. The plays are typed as "new source to old reservoir" in the southern basin. However, in the northern basin, plays belong to a complex type including both the "new source to old reservoir" and "old source to new reservoir".