边缘坳陷(marginal deep)又称前渊(forodeep),是伴随地槽褶皱隆起,在它与地台交界地带形成的大型坳陷。其内部结构通常是不对称的,并为独特的沉积建造(近海含煤建造、磨拉石建造、含盐建造)所充填。岩浆活动不明显。在发展过程中其坳陷中心逐渐向地台方向迁移。
南黄海北部坳陷为欧亚大陆东部边缘一系列新生代裂谷盆地中的一个。
The north depression in the southern Yellow Sea basin is one of the Cenozoic rift basins in the east margin of the Eurasian continent.
盆地东部坳陷原油成熟度总体分布格局是:东高西低,坳陷内部低边缘高。
The maturities of oils in the eastern depression of this basin show an increasing trend on the whole from west to east and from depression center towards margin.
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