莺歌海盆地坡折带特征及其对沉积体系的控制

谢玉洪; 王振峰; 解习农; 任建业; 姜涛

莺歌海盆地坡折带特征及其对沉积体系的控制

谢玉洪^{1, 2,},
王振峰^{1, 2},
解习农¹,
任建业¹,
姜涛¹

1.
中国地质大学资源学院, 湖北武汉 430074
2.
中海石油有限公司湛江分公司, 广东湛江 524057

基金项目:

国家高技术研究发展“863”计划 2002AA615040

国家重点基础研究发展规划“973”项目 G2000046705

详细信息

作者简介:
谢玉洪(1960-), 男, 研究员, 长期从事海洋油气勘探和开发的技术和管理工作.E-mail: wangzhf@cnooc.com.cn

中图分类号: P539.1;P618.13
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出版历程
- 收稿日期: 2004-06-12
- 刊出日期: 2004-09-25

Patterns of Slope-Break Zone and Their Depositional Models in the Yinggehai Basin

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Zhanjiang Filiale, CNOOC China Ltd., Zhanjiang 524057, China

摘要

摘要: 坡折带是层序样式划分的重要依据.大量地震剖面的精细解剖表明, 莺歌海盆地坡折带可划分为构造坡折带和沉积坡折带, 进而将层序构成样式划分为四类, 即挠曲坡折型、断裂坡折型(生长断裂型)、沉积坡折型(陆架陆坡型, 相当于Ⅰ类层序)和缓坡型.不同类型层序样式控制不同低位体的空间分布.挠曲坡折、断裂坡折和沉积坡折控制了各三级层序中斜坡扇和盆底扇的分布, 而缓坡控制强制性海退型低位三角洲的分布.详细的构造研究表明, 莺歌海盆地裂后期边缘断裂, 如①号断裂和莺东断裂在不同时期不同部位仍表现出程度不同的活动性.正是由于这些断层的活动性及其在空间上的差异性, 控制了盆地内坡折带的发育.
- 坡折带类型 /
- 沉积模式 /
- 莺歌海盆地
Abstract: The slope-break is thought to be an important criterion to distinguish the patterns of sequences. In the Yinggehai basin, the slope-break can be classified into two types: structural and sedimentary slope-break zones, which can be divided further into four patterns, that are bend slope-break, fault slope-break(growing fault), sedimentary slope-break(shelf/slope-break)and gentle slope types. Different patterns of sequences control different distributions of lowstand sandstones. The bend slope-break, fault slope-break and sedimentary slope-break restrict the distribution of slope fans and basin floor fans in the third-order sequences, and the gentle slope-break limits the distribution of lowstand deltas which were formed in the course of restricted sea-level decrease. The results of tectonic researches show that the marginal faults, such as the No.1 fault and the Yingdong fault, still are active during the post-rifting stage, which controlled the formation of slope-break in this basin.
- pattern of slope-break /
- depositional model /
- Yinggehai basin

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图 1 莺歌海盆地东侧不同类型坡折带分布

Fig. 1. Distribution of different slope-breaks in the eastern part of Yinggehai basin

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图 2 莺歌海盆地发育陆架-陆坡体系的层序样式

Fig. 2. Sequence pattern of shelf-slope system in Yinggehai basin

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图 3 莺歌海盆地裂后期古沉积地貌发育的构造背景

Fig. 3. Structural setting of formation of paleo-depositional topography during post-rifting stage in Yinggehai basin

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图 4 莺歌海盆地梅山组二段低位体平面分布及其与古地貌关系

Fig. 4. Distribution of lowstands bodies and its relationship with paleo-topography in Yinggehai basin

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图 5 莺歌海盆地不同坡折类型及其沉积模式

Fig. 5. Patterns and depositional models of slope-breaks in Yinggehai basin

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表 1 4种层序样式的沉积体系及其配置样式

Table 1. Depositional pattern and distribution in four kinds of sequences in Yinggehai basin

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