摘要
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 。
The Mg’ contents of protomagma in Nanpu Sag are mainly 0.65～0.75.The incompatible elements of rare earth and trace elements are rich and compatible elements are deficient.This suggests that the protomagma was controlled by the fusion of upper mantle source rock.The structural sequences of stretch rift basin is usually composed of coarse grain sequence in the bottom,volcanic rock bearing sequence in the lower part,deep water sequence in the mid part and filling sequence in the upper part.Nanpu Sag could be divided into 6 sequences accordingly.The third and fourth sequences controlled the distribution of the two main petroleum systems of the sag.The formation mechanism of the sag was related of the upwelling of the mantle,and was controlled by the evolution model of active rift.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2000年第4期304-307,共4页
Oil & Gas Geology
关键词
火山活动
构建层序
机制
南堡凹陷
裂陷旋回
volcanic activity
structural sequence
basin dynamicss
mechamism
Nanpu Sag
