|本期目录/Table of Contents|

[1]李洪博 郑金云 庞 雄 任建业 李瑞彪.南海北部陆缘差异拆离作用结构样式与控制因素——以珠江口盆地白云-荔湾深水区为例[J].中国海上油气,2020,32(04):24-35.[doi:10.11935/j.issn.1673-1506.2020.04.003]
 LI Hongbo ZHENG Jinyun PANG Xiong REN Jianye LI Ruibiao.Structural patterns and controlling factors of differential detachment in the northern continental margin of the South China Sea:Taking Baiyun-Liwan deep water area in the Pearl River Mouth basin as an example[J].China Offshore Oil and Gas,2020,32(04):24-35.[doi:10.11935/j.issn.1673-1506.2020.04.003]
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南海北部陆缘差异拆离作用结构样式与控制因素——以珠江口盆地白云-荔湾深水区为例()

《中国海上油气》[ISSN:1673-1506/CN:11-5339/TE]

卷:
第32卷
期数:
2020年04期
页码:
24-35
栏目:
油气勘探(南海东部海域勘探成果专辑)
出版日期:
2020-07-25

文章信息/Info

Title:
Structural patterns and controlling factors of differential detachment in the northern continental margin of the South China Sea:Taking Baiyun-Liwan deep water area in the Pearl River Mouth basin as an example
文章编号:
1673-1506(2020)04-0024-12
作者:
李洪博1 郑金云1 庞 雄1 任建业2 李瑞彪1
(1. 中海石油(中国)有限公司深圳分公司 广东深圳 518054; 2. 中国地质大学(武汉)资源学院 湖北武汉 430074)
Author(s):
LI Hongbo1 ZHENG Jinyun1 PANG Xiong1 REN Jianye2 LI Ruibiao1
(1. CNOOC China Limited, Shenzhen Branch, Shenzhen, Guangdong 518054, China; 2. Faculty of Earth Resources, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China)
关键词:
珠江口盆地 白云-荔湾深水区 差异拆离作用 结构样式 控制因素 演化模式
Keywords:
Pearl River Mouth basin Baiyun-Liwan deep water area differential detachment structural patterns controlling factors evolution mode
分类号:
TE121.2
DOI:
10.11935/j.issn.1673-1506.2020.04.003
文献标志码:
A
摘要:
珠江口盆地白云-荔湾深水区处于南海北部陆缘地壳伸展薄化的细颈化带和远端带,其盆形结构十分复杂且差异性显著。基于陆缘伸展拆离薄化模式和构造解析方法,综合运用重磁、地震、钻井等资料,对白云-荔湾深水区裂陷期伸展拆离作用进行了研究,明确了不同拆离作用控制洼陷结构特征的差异性,分析了差异拆离作用的控制因素,提出了差异拆离作用发育演化模式。研究表明,白云-荔湾深水区裂陷期地壳发育向陆和向洋的2套拆离断裂系统,形成4种类型拆离结构样式及其控制下的洼陷结构,即白云东洼为壳上拆离同改造型前展式箕状断陷,白云主洼为壳幔拆离扩展型多级断阶式宽深断陷,白云西洼为弱拆离过渡型双断复式断陷,荔湾凹陷为壳内拆离强改造型前展式宽断陷; 控制差异拆离样式的主要因素为岩石圈圈层流变性差异、先存中生代分布格局及岩石圈横向结构差异、周缘板块的伸展应力迁移与集中以及深部岩浆底侵作用的差异隆升; 南海北部陆缘岩石圈差异伸展和盆地发育过程分为初始裂陷期、拆离期及断拗期等3个演化阶段,其中拆离期与断拗期是盆形结构发生分异的主要阶段。本文研究成果对于认识被动陆缘岩石圈破裂过程具有新的启示意义
Abstract:
Baiyun-Liwan deep water area in the Pearl River Mouth basin is located in the neck-like belt and distal belt of continental margin crust thinning, northern South China Sea, and its basin structure is very complex, with obvious differential features. Based on the mode of the continental margin crust thinning caused by extension and detachment, and structural analysis method, combined with the comprehensive application of the data of gravity and magnetism, seismic, drilling wells, etc., the extension-detachment in chasmic stage was researched, hence making clear the difference of depression structure features controlled by different detachment and analyzing the controlling factors of differential detachment, and the development and evolution mode of differential detachment was further put forward. The results show that there are two sets of detachment systems, namely the landward one and seaward one that developed in the crust of Baiyun-Liwan deep water area during chasmic stage, and four structural patterns of differential detachment as well as their controlled four corresponding depression structure types are put forward as follows: the eastern Baiyun sag belongs to extensional dustpan-like fault depression of upper crust part detachment syn-reformed type, the major Baiyun sag belongs to wide and deep depression with multiple-step fault terrace of crust and mantle detachment-extension type, the western Baiyun sag belongs to transitional double-fault compound fault depression of weak detachment type, and the Liwan sag belongs to extensional wide fault depression of inner-crust detachment intense-reformed type. The major factors controlling the differential detachment patterns include lithosphere rheological difference, the existed differential distribution pattern of Mesozoic and its transverse structure difference of lithosphere, the extensional stress migration and concentration of peripheral plates, and the differential uplift caused by deep magma underplating. The lithosphere differential extension and basin development processes of continental margin, in the northern South China Sea, can be divided into three evolutionary phases, that is, the initial chasmic stage, detachment stage and fault depression stage, among which the detachment stage and fault depression stage are the primary stages for basin structure differentiation. The achievements obtained in this research are of new meaning of enlightening to understand the lithosphere rupture process of passive continental margin

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备注/Memo

备注/Memo:
收稿日期:2020-02-25 改回日期:2020-06-04*“十三五”国家科技重大专项“珠江口盆地陆缘深水区油气地质及勘探关键技术(2016ZX05026-003)”部分研究成果。 第一作者简介: 李洪博,男,工程师,主要从事区域构造和油气地质综合研究。地址:广东省深圳市南山区后海滨路(深圳湾段)3168号中海油大厦A座(邮编:518054)。E-mail:lihb8@cnooc.com.cn。
更新日期/Last Update: 2020-07-20