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渤海地区的第三系具有多层系含油的特点,各含油层系在不同地区(带)的油气富集程度各不相同.每一个地区(带)往往有几个含油气层系,但其中常常只有一、二个层系为主,占该区(带)储量的大部分.而这些含油气层系的分布,受到第三纪不同时期的沉陷中心的控制.并随着沉陷中心的迁移而改变.从盆地边缘向盆地中心,沉陷中心具有由老变新的迁移现象.含油气层系也随之由“下部组合”(E_2)→“中部组合”(E_3S)→“上部组合”(E_3d-N)依次变化的特点.
The Tertiary in the Bohai Sea has the characteristics of a multi-layered oil system, and each oil-bearing system has different degrees of hydrocarbon enrichment in different regions (strata), and there are often several hydrocarbon-bearing strata in each region Often, there are only one or two layers, accounting for most of the reserves in the area, and the distribution of these petroleum-bearing strata is controlled by the subsidence centers in different periods of the Tertiary. With the migration of the subsidence centers While the center of the subsidence has the migration from the old to the new from the edge of the basin to the center of the basin.The hydrocarbon-bearing strata are also changed from “E_2” to “E_3S” → " E_3d-N) followed by changes in the characteristics.