琼东南盆地中中新统海底扇碎屑岩锆石U-Pb年龄特征及物源分析

龚胜利; 闫琢玉; 李百强; 张铜耀; 吴土荣; 彭俊峰; 郑磊; 张东峰; 黄向胜; 罗程飞; 王任

doi:10.19509/j.cnki.dzkq.tb20230534

琼东南盆地中中新统海底扇碎屑岩锆石U-Pb年龄特征及物源分析

doi: 10.19509/j.cnki.dzkq.tb20230534

龚胜利^1,,
闫琢玉^{1, 2, 3a, 3b, ,},
李百强⁵,
张铜耀¹,
吴土荣^{1, 2},
彭俊峰^{1, 2},
郑磊^{1, 2},
张东峰^{1, 2},
黄向胜^{1, 2},
罗程飞^{1, 2},
王任^{1, 2}

1.
中海油能源发展股份有限公司工程技术分公司, 天津 300450
2.
广东省海上高温高压油气藏勘探开发企业重点实验室, 广东湛江 524057
3a.
中国地质大学(武汉)地球科学学院, 武汉 430074
3b.
中国地质大学(武汉)地质过程与矿产资源国家重点实验室, 武汉 430074
4.
安徽理工大学地球与环境学院, 安徽淮南 232001

基金项目:

中海石油(中国)有限公司科研项目"琼东南盆地梅山组有效浊积储集体主控因素及储层预测技术" YXKY-ZX 03 2021

安徽理工大学高层次引进人才科研启动基金项目 2023yjrc81

详细信息

作者简介:
龚胜利, E-mail: gongshl@cnooc.com.cn

通讯作者:
闫琢玉，E-mail：yanzhy3@cnooc.com.cn

中图分类号: P618.51
计量
- 文章访问数: 324
- PDF下载量: 84
- 被引次数: 0
出版历程
- 收稿日期: 2023-09-20
- 录用日期: 2024-01-16
- 修回日期: 2023-12-13

U-Pb age characteristics of detrital zircon and provenance analysis of a Middle Miocene submarine fan in the Qiongdongnan Basin

GONG Shengli^1
,,
YAN Zhuoyu^{1, 2, 3a, 3b
, ,},
LI Baiqiang⁵,
ZHANG Tongyao¹,
WU Turong^{1, 2},
PENG Junfeng^{1, 2},
ZHENG Lei^{1, 2},
ZHANG Dongfeng^{1, 2},
HUANG Xiangsheng^{1, 2},
LUO Chengfei^{1, 2},
WANG Ren^{1, 2}

1.
Engineering Technology Company, CNOOC Energy Development Co., Ltd., Tianjin 300450, China
2.
Guangdong Province Offshore High Temperature and High Pressure Oil and Gas Reservoir Exploration and Development Enterprise Key Laboratory, Zhanjiang Guangdong 524057, China
3a.
Faculty of Earth Science, China University of Geosciences(Wuhan), Wuhan 430074, China
3b.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Wuhan), Wuhan 430074, China
4.
School of Earth and Environment, Anhui University of Science and Technology, Huainan Anhui 232001, China

More Information

Author Bio:
GONG Shengli, E-mail: gongshl@cnooc.com.cn

Corresponding author: YAN Zhuoyu, E-mail: yanzhy3@cnooc.com.cn

摘要

摘要:
琼东南盆地中中新统海底扇是南海北部天然气勘探的重要目标, 但长期以来对该海底扇沉积物的物源并未达成共识, 因此, 物源分析对于该区天然气勘探有利目标优选具有重要意义。通过钻井取心开展了碎屑锆石U-Pb年龄谱特征研究, 并与周缘潜在物源区锆石U-Pb年龄进行了对比分析, 示踪了研究区中中新统海底扇物源。结果表明: ①盆地北部N-1、N-2、N-3、N-4等4口井碎屑锆石U-Pb年龄表现为燕山期(160, 157, 133, 107, 102, 99 Ma)、印支期(249, 241, 239 Ma)、加里东期(466, 455 Ma)的年龄峰值特征, 且与中国海南岛碎屑锆石U-Pb年龄特征相似度高, 但与红河、越南中部碎屑锆石U-Pb年龄特征相似度低; ②盆地南部S-1、S-2、S-3等3口井碎屑锆石U-Pb年龄特征表现为印支期(242, 238, 237 Ma)、加里东期(435, 431, 425 Ma)、海西期(396, 392 Ma)以及燕山期(143 Ma)的年龄峰值特征, 且S-2井具有较年轻的喜马拉雅期(21 Ma)单峰年龄特征。琼东南盆地北部中中新统沉积物源主要来自海南岛, 红河及越南中部物源对其影响非常有限, 盆地南部中中新统为红河和海南岛双物源供给, 且以红河物源为主, 自西向东差异明显。
- 锆石U-Pb年龄 /
- 物源 /
- 海底扇 /
- 中中新统 /
- 琼东南盆地 /
- 碎屑岩
Abstract: Objective
The middle Miocene submarine fan in the Qiongdongnan Basin is an important target for natural gas exploration in the northern South China Sea. However, there has been no consensus on the source of submarine fan sediments for a long time. Provenance analysis will be important for the optimization of natural gas exploration in this area.
Methods
In this paper, the detrital zircon U-Pb age spectrum characteristics of drilling cores from the middle Miocene submarine fan in the Qiongdongnan Basin were analysed and compared with the U-Pb ages of zircons from potential provenance areas to determine the source of submarine fans in the study area.
Results
The results show that ① the U-Pb ages of detrital zircons from the N-1, N-2, N-3 and N-4 wells in the northern part of the basin are characterized by Yanshanian (160, 157, 133, 107, 102, 99 Ma), Indosinian (249, 241, 239 Ma) and Caledonian (466, 455 Ma) age peaks and have high similarity with the U-Pb age characteristics of detrital zircons from Hainan Island sediments but low similarity with the U-Pb age characteristics of detrital zircons from Red River and central Vietnam sediments. ② The detrital zircon U-Pb ages of three wells (S-1, S-2, and S-3) in the southern part of the basin show peak ages of Caledonian (435, 431, 425 Ma), Hercynian (396, 392 Ma), Indosinian (242, 238, 237 Ma), and Yanshanian (143 Ma). The S-2 well has a younger unimodal Himalayan (21 Ma) age peak.
Conclusion
The provenance of the middle Miocene in the northern part of the basin is Hainan Island. The influence of the provenance on the Red River and Central Vietnam is very limited. The provenance of the middle Miocene in the southern Qiongdongnan Basin was a double-source supply from the Red River and Hainan Island and was dominated by the former, with an obvious difference from west to east.
- zircon U-Pb age /
- provenance /
- submarine fan /
- Middle Miocene /
- Qiongdongnan Basin /
- detrital
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 琼东南盆地构造分区和新生代地层综合柱状图(据文献[3-4,13,24-31])

Figure 1. Tectonic division and Cenozoic stratigraphic column of the Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 2 琼东南盆地中中新统典型碎屑锆石阴极发光(CL)图像

Figure 2. Cathodoluminescence(CL) images of typical detrital zircons from the Middle Miocene Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 3 琼东南盆地中央坳陷周缘潜在物源区砂岩样品碎屑锆石U-Pb年龄谱图(据文献[3,10-11,13,38])

Figure 3. Detrital zircon U-Pb age spectrum of sandstone sediments from potential provenance areas around the Central Depression of Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 4 琼东南盆地中央坳陷北部典型井砂岩样品碎屑锆石U-Pb年龄谱图

Figure 4. Detrital zircon U-Pb age spectrum of the sandstone samples from typical wells in the northern Central Depression of Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 5 琼东南盆地中央坳陷南部典型井砂岩样品碎屑锆石U-Pb年龄谱图

Figure 5. Detrital zircon U-Pb age spectrum of the sandstone samples from typical wells in the southern Central Depression of Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 6 琼东南盆地典型井与潜在物源区锆石U-Pb年龄数据相关性分析

Figure 6. Correlation analysis of detrital zircon U-Pb age between typical wells and potential source area in the Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 7 琼东南盆地中中新统“源-汇”模式图

箭头大小表示物源影响程度，箭头越大，反映物源影响越强；虚线为边界线

Figure 7. Source-to-sink pattern diagram of the Middle Miocene in the Qiongdongnan Basin

下载: 全尺寸图片幻灯片

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