Neotectonism and Neogene oil and gas pools in the Bohai Bay basin

Li Dawei

doi:10.11743/ogg20040209

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Neotectonism and Neogene oil and gas pools in the Bohai Bay basin
Vol. 25, Issue 2, Pages: 170-174(2004)
Online First：25 April 2004，

Published：2004
DOI： 10.11743/ogg20040209
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DOI：

Li Dawei. Neotectonism and Neogene oil and gas pools in the Bohai Bay basin[J]. 2004, 25(2): 170-174. DOI： 10.11743/ogg20040209.

摘要

从区域重力场、构造演化、火山活动、天然地震以及人工地震等方面的分析

渤海湾盆地新构造运动活跃

目前发现的上第三系油气藏主要分布在新构造运动相对活跃的渤中、济阳、黄骅等坳陷

上第三系大型油气田的形成与很多地质因素有关

但上新世以来的新构造运动起着关键作用

新构造运动不仅促进油气的富集成藏

而且对下第三系古油藏进行一定的调整

发生油气的再次运移、再次聚集而形成上第三系的次生油气藏。据地震、钻井等资料综合分析:渤海湾盆地上第三系油气藏主要分布于继承性活动大断层下降盘的逆牵引构造中。预测新构造运动相对活跃的渤中坳陷及其周边断裂带是勘探上第三系油气藏的有利地带。

Abstract

Studies of regional gravitational field

tectonic evolution

volcanic activities

earthquake and seismic data show that neotectonic movements are active in Bohai Bay basin.The existing Neogene oil and gas pools are mainly distributed in depressions

such as Bozhong

Jiyang and Huanghua

where neotectonic movements are relatively active.The neotectonic movements since Pliocene play a key role in the formation of large Neogene fields

though many other geologic factors make also their contributions.The neotectonic movements would not only improve hydrocarbon accumulation

but would also modify the Paleogene palaeo-pools

leading to the formation of Neogene secondary oil and gas pools through remigration and re accumulation.Comprehensive analysis of seismic and drilling data indicates that the Neogene oil and gas pools in this region are mainly distributed in the reverse drag structures on the footwalls of large inherited active faults.The Bozhong depression and the surrounding fault zones with relatively active neotectonic movements are expected to be favorable areas for exploration of Neogene oil and gas pools.