歧口凹陷重要断裂构造和构造带特征研究

The Study of Important Fault Structure and Its Structural Character in Qikou Sag of Dagang Oilfield

摘要: 本文应用最近资料对岐口凹陷重要断裂带沧东断裂带、海河新港断裂带、滨海断鼻和埕北断阶带及其构造特征研究，认为：沧东断裂带具有明显的分段性，不同区段的产状和位移特征有明显差异；海河新港断裂是一个中生代印支期发育的逆冲断裂，经新生代的负构造反转作用而成；滨海断鼻依附于滨海断层，由滨海二台阶和港东断层下降盘大型鼻状构造组成，构造完整、规模大；埕北断阶带为北倾正向断裂，断层依次北调，剖面上断裂切割地层而形成南高北低台阶状断阶带。

Abstract: Using the latest datum, the studying conclusion of Qikou sag of Dagang oilfield’s important faulting belts such as the Cangdong faulting belt, the Haihe-Xingang faulting belt, the Binhai faulted nose and the Cengbei fault terrace belt and their structural character are as follows: the Cangdong faulting belt has obvious segmentation; different zones’ occurrence and displacement character have obvious differences; the Haihe-Xingang faulting belt is a indo-china period in the mesozoic beginning thrust faulting, formed by structural inversion in Cenozoic; the Binhai faulted nose is attached to the the Binhai fault, constituted by Binhai small step and the Gangdong fault downthrown side big structural nose, has large-scale integrated structure; the Cengbei fault terrace belt is north-trend positive faulting. Fault structure falls toward north one by one. Faulting structure cuts up the layer and shapes south high-north low steps fault terrace belt.