| 珠江口盆地白云凹陷中央底辟带的发现及识别 |
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| 引用本文： | 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[J].地球科学,2006,31(2):209-213. |
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| 作者姓名： | 王家豪 庞雄 王存武 何敏 连世勇 |
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| 作者单位： | 中国地质大学资源学院,湖北,武汉,430074;中海石油(中国)有限公司深圳分公司技术部,广东,广州,510240 |
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| 基金项目： | 国家高技术研究发展计划(863计划);国家自然科学基金 |
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| 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.
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| 关 键 词： | 珠江口盆地 白云凹陷 底辟构造 |
| 文章编号： | 1000-2383（2006）02-0209-05 |
| 收稿时间： | 2005-06-13 |
| 修稿时间： | 2005-06-13 |
Discovery and Recognition of the Central Diapiric Zone in Baiyun Depression, Pearl River Mouth Basin |
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| WANG Jia-hao,PANG Xiong,WANG Cun-wu,HE Min,LIAN Shi-yong.Discovery and Recognition of the Central Diapiric Zone in Baiyun Depression, Pearl River Mouth Basin[J].Earth Science-Journal of China University of Geosciences,2006,31(2):209-213. |
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| Authors: | WANG Jia-hao PANG Xiong WANG Cun-wu HE Min LIAN Shi-yong |
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| Institution: | 1. Facultyof Earth Resources, China University of Geosciences, Wuhan 430074, China ; 2. CNOOC Ltd. Shenzhen, Guangzhou 510240, China |
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| 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. |
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| Keywords: | Pearl River Mouth basin Baiyun depression diapiric structure |
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