POLYPHASE PULLS AND APARTS OF ACTIVE RIFT IN NANPU DEPRESSION AND THEIR RELATIONSHIP WITH OIL AND GAS

Cong Liangzi; Zhou Haimin

doi:10.11743/ogg19980406

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POLYPHASE PULLS AND APARTS OF ACTIVE RIFT IN NANPU DEPRESSION AND THEIR RELATIONSHIP WITH OIL AND GAS
Vol. 19, Issue 4, Pages: 296-301(1998)
Online First：25 December 1998，

Published：1998
DOI： 10.11743/ogg19980406
稿件说明：

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DOI：

Cong Liangzi, Zhou Haimin. POLYPHASE PULLS AND APARTS OF ACTIVE RIFT IN NANPU DEPRESSION AND THEIR RELATIONSHIP WITH OIL AND GAS[J]. 1998, 19(4): 296-301. DOI： 10.11743/ogg19980406.

摘要

南堡凹陷为渤海湾盆地北侧的一个小型含油气凹陷

其构造演化在渤海湾的诸多断陷中具有很强的代表性。该凹陷不仅具有明显的主动裂谷演化特征

而且是一个中、新生代叠合发育

经多幕裂陷演化

油气资源极为丰富的小型含油气凹陷。印支期

本区处于裂谷前的基底隆起剥蚀阶段。燕山-喜山期

凹陷经历了四幕裂谷作用演化和一幕构造再活化作用的改造。其四幕裂谷作用包括燕山早期裂谷一幕发育期、燕山晚期裂谷二幕发育期、早第三纪始新世-渐新世中期裂谷三幕发育期及早第三纪渐新世中晚期-晚第三纪中新世早期裂谷四幕发育期。晚第三纪中新世中期以来

该区构造性质发生明显转变

即由中新世早期的构造衰弱期转化为新的构造活化期

主要表现在:断裂作用加剧、拉张作用增强、沉积速率加快。上述各幕构造过程对南堡凹陷的油气生成及富集规律具有明显不同的作用。

Abstract

Nanpu depression

located in the north of the Bohai Gulf Basin

is a small Mesozoic Cenozoic superimposed sag with abundent hydrocarbon resources.It is characterized by the geodynamic regime of active rifting with polyphases of extension.During the Indo-Chinese epoch

Nanpu Depression experienced a prerifting and erosion stage with the maxim erosion thickness of 2 km.Since the Early Jurassic

Nanpu Depression has experienced an evolution of four phases of rifting and a period of tectonic reactivation.The four phases of rifting took place in Early Mesozoic

Late Mesozoic

Eocene to Mid-Oligocene and Mid-Oligocene to Miocene respectively.Different stages of tectonic evolution played different roles in the hydrocarbon generation and occurence of the depression.