南沙海域盆地的地层系统与沉积结构

孙珍; 赵中贤; 周蒂; 杨少坤; 林鹤鸣; 陈广浩

doi:10.3799/dqkx.2011.082

南沙海域盆地的地层系统与沉积结构

doi: 10.3799/dqkx.2011.082

1.
中国科学院南海海洋研究所边缘海地质重点实验室, 广东广州 510301
2.
中国海洋石油有限公司深圳分公司勘探部, 广东深圳 518067
3.
中国科学院广州分院, 广东广州 510070

基金项目:

中国科学院知识创新工程重要方向项目群项目 KZCX2-YW-Q05-04

国家重点基础研究发展“973”计划项目 2007CB41170405

国家科技重大专项 2008ZX05025-005

详细信息

作者简介:
孙珍(1971—), 女, 研究员, 主要从事构造分析与模拟研究

通讯作者:
赵中贤, E-mail: zxzhao@scsio.ac.cn

中图分类号: P736.1
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- 文章访问数: 3241
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- PDF下载量: 63
- 被引次数: 0
出版历程
- 收稿日期: 2011-05-28
- 刊出日期: 2011-09-15

The Stratigraphy and the Sequence Achitecture of the Basins in Nansha Region

1.
CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2.
Exploration Department, China National Of fshore Oil Corporation Limited, Shenzhen 518067, China
3.
Guangzhou Division of the Chinese Academy of Sciences, Guangzhou 510070, China

摘要

摘要: 南沙海区是我国领土的重要部分, 富含油气资源, 但也存在很多的科学问题.为了系统分析和对比各盆地的结构特征和沉积历史, 结合已有的地震剖面资料, 对南沙海区的万安、曾母、北康、南薇西和礼乐盆地几个代表性盆地, 开展了沉积层序的划分对比.结果发现, 除曾母盆地以外, 南沙海区的沉积地层基本上可以根据张裂不整合面(T_g)、解体不整合面和断拗不整合面分为3个构造层4个构造期.其中, 下构造层为中生代地层, 分布范围不连续, 东区的礼乐盆地要比中区和西区中生代地层厚, 隆起下比凹陷内部厚, 属于断陷前层序; 中构造层在曾母和万安盆地以T₄₀为顶界, 其他几个盆地都以T₆₀为顶界面, 下部为断陷层序, 上部为断拗层序, 断拗层序推测为漂移期沉积; T₄₀ (或T₃₂) 之后的上构造层为拗陷期.根据地层的翘倾、削蚀和褶皱的情况来看, 南沙地块内盆地在中中新世(T₄₀) 前后发生了一期明显的受压抬升和褶皱变形事件, 这一变形事件在北康-南薇西盆地表现尤为明显, T₄₀界面之下地层表现出明显的透镜状增厚, 且伴随着新断裂的发育, 中新世(T₄₀-T₃₂) 地层具有顶薄翼厚的披覆沉积特点, 推测其与南沙地块和婆罗洲的陆陆碰撞接触有关.经过初步的共轭对比认为, 曾母盆地与莺歌海盆地比较相似, 北康-南薇西盆地的沉积结构和演化历史与琼东南盆地有很多相似; 根据南海海盆的共轭对比可知, 礼乐盆地在南海海盆扩张前, 大致以西南次海盆与中沙隆起共轭, 这与礼乐盆地内解体不整合面为T₆₀的解释一致.
- 南沙海域 /
- 地层系统 /
- 共轭陆缘盆地 /
- 碰撞事件 /
- 海洋地质 /
- 沉积
Abstract: Nansha region is an important part of our country, with great potential for hydrocarbon resources and scientific researches.In order to analyze and compare the basins' structure as well as the sedimentary history systematically, we interprete most of the seismic profiles we have to carry out the stratigraphic correlation between Wan'an, Zengmu (Great Sarawak), Beikang, Nanweixi and Liyue basin.It is found that the stratigraphy are divided into three tectonic periods and four stages, divided by rifting unconformity (T_g), breakup unconformity (T₆₀ or T₄₀), and rifting-depressing unconformity (T₄₀ or T₃₂).The lower tectonic periods are composed of Mesozoic strata, distributed discontinuously, thicker in the Liyue basin and beneath uplift.It's the pre-kinematic sequence.The middle tectonic period is separated into rifting stage in the lower part and rifting-depressing stage in the upper part by T₄₀ in Wan'an and Zengmu basin, and by T₆₀ in Beikang, Nanweixi and Liyue basin.The sedimentation in the rifting-depressing stage may be caused by the drift of the Nansha block.The sequence after T₄₀ (or T₃₂) belongs to depressing stage.According to the rotation, erosion and fold structure, there is a collision event around Middle Miocene (T₄₀), which is especially obvious in Beikang-Nanweixi basin.Besides the folding wave on the surface, the lens-shaped Early Miocene sequence accompanied with newly formed shear faults between T₆₀ and T₄₀ showed a compressive moment around T₄₀, furthermore the Middle Miocene sequence (T₄₀—T₃₂) appear draping with thin top and thick wing.We suppose that the Nansha block collided with Borneo at this time.Relative to the northern continental margin, Zengmu seems much similar with Yinggehai basin, Beikang-Nanweixi basin seems to be conjugate with Qiongdongnan and Zhongjiannan.Liyue basin should be conjugate with Zhongsha uplift by SW sub sea basin.This conjugate pattern is consistent with the phenomena that T₆₀ is the breakup unconformity.
- Nansha region /
- stratigraphic system /
- conjugate margin basin /
- collision event /
- marine geology /
- sedimentaiton

HTML全文

图 1 南沙海域盆地与测线分布简图

其中数字、字母L和N开头的地震剖面是本文工作解释的地震剖面, 其他字母开头的测线为对比测线; 断裂据金庆焕和李唐根, 2000;万安盆地剖面据Lee et al., 2001; 曾母盆地剖面据Mat-Zin and Tucker, 1999; 南沙海槽盆地剖面据Franke et al., 2008; 星号为使用的钻井

Fig. 1. The distribution of basins and seismic lines used in the Nansha region

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图 2 横穿万安、曾母、北康-南薇西和礼乐盆地的地震剖面结构(剖面位置见图 1中的粗实线段)

Fig. 2. The interpreted seismic profiles across Wan'an, Zengmu, Beikang-Nanweixi and Liyue basins

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图 3 万安盆地局部剖面反射特点图(具体位置见图 2)

Fig. 3. The reflection features in Wan'an basin

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图 4 曾母盆地的地震剖面87N6东段地震反射特征(其位置见图 2)

Fig. 4. The reflection features on the eastern segment of Profile 87N6

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图 5 南薇西—北康盆地主要层位的反射特征剖面段(剖面位置见图 1, 2)

Fig. 5. The reflection features of the main sequences in Nanweixi-Beikang basin

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图 6 礼乐盆地L2剖面识别出的主要地层(剖面位置见图 2)

Fig. 6. The main sequences discriminated in profile L2

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图 7 南沙海域自西向东地层系统的对比

Fig. 7. The sequence comparison of the Nansha region from west to east

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图 8 以L2剖面南段为例分析南沙海域盆地构造分层(剖面位置见图 2)

Fig. 8. The structure analysis of the Nansha region exampled with the southern segment of L2

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图 9 南海共轭陆缘的对应关系(等深线, 单位: m)

Fig. 9. The counterpart of the conjugate margin in the South China Sea

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