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南堡凹陷原生岩浆的Mg’值大部分分布在 0 6 5～ 0 75之间 ;稀土和微量元素中不相容元素富集、相容元素亏损。由此说明该区火山岩受控于上地幔源岩的部分熔融作用。伸展裂谷型盆地的构造层序由下而上一般由底部粗粒层序组、下部含火山岩层序组、中部深水层序组和上部充填层序组组成 ,南堡凹陷据此可划分出 6个构造层序 ,其中第三、四构造层序控制了南堡凹陷两期主要的含油气系统分布。南堡凹陷盆地形成机制主要与地幔上涌作用有关 ,受控于主动裂谷演化模式
Most of the magma ’s magma values in the Nanpu sag range from 0 6 5 to 0 75; the incompatible elements in rare earths and trace elements are enriched, and the loss of compatible elements. This shows that the volcanic rocks in this area are controlled by the partial melting of the upper mantle source rocks. The structural sequence of extensional rift basins is composed of the bottom coarse-grained sequence group, the lower volcanic sequence group, the central deep-water sequence group and the upper filling sequence group from bottom to top, and the Nanpu Sag can be divided accordingly Six structural sequences, of which the third and fourth tectonic sequences control the distribution of two major petroleum systems in Nanpu Sag. The formation mechanism of Nanpu sag basin is mainly related to upwelling of mantle and controlled by active rift evolution model