珠江口盆地白云凹陷中央底辟带的发现及识别

王家豪; 庞雄; 王存武; 何敏; 连世勇

珠江口盆地白云凹陷中央底辟带的发现及识别

1.
中国地质大学资源学院, 湖北武汉 430074
2.
中海石油(中国)有限公司深圳分公司技术部, 广东广州 510240

基金项目:

国家自然科学基金重点项目 40238060

国家面上基金项目 40238060

详细信息

作者简介:
王家豪(1968 -), 男, 副教授, 主要从事沉积学、层序地层学研究.E-mail: cugwangjiahao@163.com

中图分类号: P618.13
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出版历程
- 收稿日期: 2005-06-13
- 刊出日期: 2006-03-25

Discovery and Recognition of the Central Diapiric Zone in Baiyun Depression, Pearl River Mouth Basin

1.
Faculty o f Earth Resources, China University o f Geosciences, Wuhan 430074, China
2.
CNOOC Ltd. Shenzhen, Guangzhou 510240, China

摘要

摘要: 白云凹陷属珠江口盆地的一个次级构造单元.通过对二维地震剖面上模糊带的分析, 凹陷中心发育北西西向展布、面积约1000km2的底辟带, 底辟幅度最大可达8km.高精度磁力资料显示底辟带为一个低磁异常区.底辟构造包括龟背上拱、弱刺穿、气烟囱、底辟断层(或裂缝)、海底麻坑等类型, 主要发源于断陷期深湖相的文昌组(始新统) —恩平组(上始新统-下渐新统), 其次为坳陷期浅海-深海相沉积的珠江组(下中新统) —韩江组(中中新统) 的两套巨厚富泥沉积层.白云凹陷具有快速沉降、细粒充填为主、以及新生代的右旋张扭性应力场, 共同造就了凹陷中央底辟带的发育.底辟构造的存在反映了白云凹陷中心曾经蕴育着高温、超压系统, 与之密切伴生的大量亮点指示着沿底辟构造的天然气垂向输导, 构成了古近系油气运移到新近系—第四系的成藏动力系统.
- 珠江口盆地 /
- 白云凹陷 /
- 底辟构造
Abstract: The Baiyun depression is a sub-unit of the Pearl River Mouth basin. In the center of this depression, fuzzy zones on 2D seismic profiles and low magnetic anomalies have been analyzed. A diapiric zone has been revealed, with a WNW directional distribution, about 1 000 km2 planar area and about 8 km most pierced thickness. The diapiric structures display various types such as a turtleback-like arch, weak piercing, gas-chimney, fault (or crack) and seabed pit, originated in two huge mud-rich strata the Wenchang Formation (Eocene) and the Enping Formation (Upper Eocene-Lower Oligocene). There are deep-lake facies in the rift period of the depression; the secondary is the Zhujiang Formation (Lower Miocene) and Hanjiang Formation (Middle Miocene), which have shallow or deep-marine facies in down-warping period. In the depression, factors are favorable for diapirism such as rapid subsidence, fine-grain sediment mainly filling, and dextral tenso-shear stress-field since the Cenozoic. The structures indicate a high temperature-overpressure system ever developed. Closely associated and abundant bright-spots show natural gas has migrated vertically, and a dynamic system has existed for petroleum transported from the Paleogene to the Neogene and Quaternary.
- Pearl River Mouth basin /
- Baiyun depression /
- diapiric structure

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图 1 白云凹陷区域构造位置(a) 及其底辟构造主要发育区(b)

1.珠江口盆地边界; 2.一级构造单元边界; 3.二级构造单元边界; 4.21 Ma反射层NWW向雁行状断裂; 5.右旋张扭性应力场方向; 6.底辟构造主要发育区; 7.图 2a、b的位置

Fig. 1. Tectonic location of the Baiyun depression and its main diapiric structure distribution

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图 2 底辟构造(a) 与南部岩浆岩体(b) 的地震反射特征比较

Fig. 2. Comparing diapiric structure (a) with southern magmatic buildup (b) on seismic profiles

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图 3 白云凹陷磁异常分布

1.白云凹陷的范围; 2.底辟带的位置

Fig. 3. Magnetic anomaly map in Baiyun depression

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图 4 龟背上拱群与底辟断层

Fig. 4. Turtleback-liking arches and diapiric faults

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图 5 刺穿构造与底辟断层

Fig. 5. A diapiric structure and diapiric faults

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图 6 气烟囱与底辟断层

Fig. 6. Gas-chimneys and diapiric faults

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图 7 底辟裂缝和海底麻坑

Fig. 7. Diapiric crack and a seabed-pit

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图 8 气烟囱群和休眠的海底麻坑

Fig. 8. A group of gas-chimneys and dormant seabed-pits

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