南海北部琼东南盆地中央峡谷体系沉积演化

doi:10.7623/syxb201303007

石油学报 ›› 2013, Vol. 34 ›› Issue (3): 467-478.DOI: 10.7623/syxb201303007

南海北部琼东南盆地中央峡谷体系沉积演化

苏明^1,2,3, 解习农³, 王振峰⁴, 姜涛³, 张成³, 何云龙³

1. 中国科学院广州能源研究所可再生能源与天然气水合物重点实验室广东广州 510640;
2. 中国科学院广州天然气水合物研究中心广东广州 510640;
3. 中国地质大学构造与油气资源教育部重点实验室湖北武汉 430074;
4. 中海石油(中国)有限公司湛江分公司技术部广东湛江 524057

收稿日期:2012-11-18 修回日期:2013-02-24 出版日期:2013-05-25 发布日期:2013-04-09
通讯作者: 苏明
作者简介:苏明,男,1983年7月生,2005年获中国地质大学(武汉)学士学位,2011年获中国地质大学(武汉)资源学院海洋科学与工程系博士学位,现为中国科学院广州能源研究所助理研究员,主要从事深水沉积体系与油气勘探、海域天然气水合物成藏地质条件分析等方面的科研工作。Email:suming@ms.giec.ac.cn
基金资助:
国家自然科学基金重大研究计划重点支持项目"南海西北大陆边缘盆地形成演化及其与南海扩张耦合关系"(No.91028009)、国家自然科学基金青年基金"南海北部琼东南盆地轴向海底峡谷充填演化及其主控因素"(No.41002031)及油气资源与探测国家重点实验室开放课题项目"琼东南盆地中央峡谷体系内部构成与储层预测"(PRP/open-1205)资助。

Sedimentary evolution of the central canyon system in Q iongdongnan Basin, northern South China Sea

SU Ming^1,2,3, XIE Xinong³, WANG Zhenfeng⁴, JIANG Tao³, ZHANG Cheng³, HE Yunlong³

1. Key Laboratory of Renewable Energy & Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China;
3. Key Laboratory of Tectonics & Petroleum Resources of the Ministry of Education, China University of Geosciences, Wuhan 430074, China;
4. Department of Technology, Zhanjiang Company Ltd., China National Offshore Oil Corporation, Zhanjiang 524057, China

Received:2012-11-18 Revised:2013-02-24 Online:2013-05-25 Published:2013-04-09

摘要/Abstract

摘要：

基于琼东南盆地二维和三维地震资料,对中央峡谷体系的形态特征和内部充填结构进行了描述和解剖,指出中央峡谷体系的"分段性"和"多期次性"特征。通过对该大型轴向峡谷体系在不同部位和不同演化阶段的差异性对比,结合晚中新世以来琼东南盆地构造—沉积条件的变化,将琼东南盆地中央峡谷体系的沉积演化划分为4个阶段,分别是晚中新世的峡谷蕴育阶段、上新世早期峡谷的侵蚀-充填阶段、上新世晚期峡谷的平静充填阶段和更新世以来峡谷的"回春"阶段。研究表明,晚中新世早期(11.6 Ma)盆地东部的区域性构造变革事件促使了峡谷雏形的形成;上新世早期西北部和北部充足的沉积物供给、南部隆起的遮挡和东部地貌特征等因素控制了中央峡谷体系自西向东的发育,并将该峡谷限制在琼东南盆地的中央坳陷带内;上新世晚期沉积条件的变化,导致峡谷只在盆地东部发育;更新世以来的气候因素和盆地东部的地貌特征共同控制了中央峡谷体系在更新世的"再次繁盛"。

关键词: 中央峡谷体系, 沉积演化, 晚中新世, 琼东南盆地, 南海北部

Abstract:

In order to further understand the central canyon system (CCS) in Qiongdongnan Basin (QDNB), a large axial submarine canyon, the present study described and dissected morphological characteristics and internal architectures of the CCS based on 2D and 3D seismic data, and the result indicated that the CCS in QDNB can be characterized by "segmentation" and "multi-phases". Based on integrated comparisons and analyses of different segments and evolution phases of the CCS and combined with changes of tectonic-sedimentary conditions of QDNB, we could divide the sedimentary evolution of the CCS into 4 phases, i.e. an initial development phase in Late Miocene (11.6 Ma-5.7 Ma), an eroded-infilling phase in Early Pliocene (5.7 Ma-3.7 Ma), a tranquil infilling phase in Late Pliocene (3.7 Ma-1.81 Ma) and a rejuvenation phase since Pleistocene (since 1.81 Ma). The regional tectonic transformation at late Middle Miocene (11.6 Ma) initiated the formation of an axial sub-basin in the eastern QDNB, which can be regarded as a rudiment of the CCS. In Early Pliocene, abundant sediments supplied the basin from the northwestern and northern sources, and the limitation from the southern uplift belt and the geomorphology of the eastern QDNB would constrain the developing course of the CCS from west to east and confine the canyon within the central depression belt. Because of the lack of deposits during Late Pliocene, the CCS then only developed in the eastern QDNB. Climate factors, a distributary effect of the northern seamount and the topography of the eastern QDNB have co-controlled the development of the modern central canyon system since Pleistocene, which is called as a rejuvenation phase of the CCS.

Key words: central canyon system, sedimentary evolution, Late Miocene, Qiongdongnan Basin, northern South China Sea

中图分类号:

TE111.3

苏明, 解习农, 王振峰, 姜涛, 张成, 何云龙. 南海北部琼东南盆地中央峡谷体系沉积演化[J]. 石油学报, 2013, 34(3): 467-478.

SU Ming, XIE Xinong, WANG Zhenfeng, JIANG Tao, ZHANG Cheng, HE Yunlong. Sedimentary evolution of the central canyon system in Q iongdongnan Basin, northern South China Sea[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(3): 467-478.

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南海北部琼东南盆地中央峡谷体系沉积演化

Sedimentary evolution of the central canyon system in Q iongdongnan Basin, northern South China Sea

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