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[1]赵 梦 庞小军 金小燕 冯 冲 王茂桢.渤海南部垦利6-6构造东二下段、馆陶组砂岩碎屑锆石定年及物源示踪[J].中国海上油气,2019,31(06):52-59.[doi:10.11935/j.issn.1673-1506.2019.06.006]
 ZHAO Meng PANG Xiaojun JIN Xiaoyan FENG Chong WANG Maozhen.Detrital zircon U-Pb geochronology and provenance tracing of the Ed2L and Ng sandstones of KL6-6 structure in the southern Bohai sea[J].China Offshore Oil and Gas,2019,31(06):52-59.[doi:10.11935/j.issn.1673-1506.2019.06.006]
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渤海南部垦利6-6构造东二下段、馆陶组砂岩碎屑锆石定年及物源示踪()

《中国海上油气》[ISSN:1673-1506/CN:11-5339/TE]

卷:
第31卷
期数:
2019年06期
页码:
52-59
栏目:
渤海海域油气勘探开发成果专辑
出版日期:
2019-11-21

文章信息/Info

Title:
Detrital zircon U-Pb geochronology and provenance tracing of the Ed2L and Ng sandstones of KL6-6 structure in the southern Bohai sea
文章编号:
1673-1506(2019)06-0052-08
作者:
赵 梦 庞小军 金小燕 冯 冲 王茂桢
(中海石油(中国)有限公司天津分公司 天津 300459)
Author(s):
ZHAO Meng PANG Xiaojun JIN Xiaoyan FENG Chong WANG Maozhen
(CNOOC China Limited, Tianjin Branch, Tianjin 300459, China)
关键词:
渤海南部 垦利6-6构造 东二下段 馆陶组 碎屑锆石定年 物源示踪
Keywords:
southern Bohai sea KL6-6 structure Ed2L Ng detrital zircon dating provenance
分类号:
TE121.3
DOI:
10.11935/j.issn.1673-1506.2019.06.006
文献标志码:
A
摘要:
为了示踪渤海南部垦利6-6构造东二下段、馆陶组砂岩沉积,对KL6-6-A井的东二下段、馆陶组2个砂岩岩屑样品进行了碎屑锆石U-Pb定年和锆石阴极发光(CL)图像分析。研究测得211个谐和年龄点,发现KL6-6-A井东二下段、馆陶组砂岩样品中白垩纪锆石含量分别为27.6%和30.5%,并都具有114 Ma主峰值和约2 500 Ma的次要峰值年龄; 锆石以100~200 μm的长柱状、短柱状晶体为主,岩浆生长振荡环带发育,具有明显的核-边结构,晶体边缘均呈棱角状,破碎晶体断边明显。因此,认为KL6-6-A井的东二下段、馆陶组砂岩为近源沉积,母岩为相邻的中生界白垩系青山组基底,当时并未拓展至胶北地区、蓬莱长岛地区、龙口屺坶岛地区等陆上地区。
Abstract:
To trace the sedimentary source-to-sink systems of the KL6-6 structure in the southern Bohai sea, 2 sandstone cuttings of Ed2L and Ng in Well KL6-6-A were collected for detrital zircon U-Pb dating analysis and Cathodoluminescence(CL)image analysis. Totally 211 concordia ages were acquired and the results showed that the two sandstone samples of Well KL6-6-A contained 27.6% and 30% Cretaceous(K)zircons respectively, with a primary peak at 114 Ma and a secondary peak at about 2 500 Ma. Besides, the columnar zircons were 100~200 μm, featuring oscillatory zones, core-edge structure, angular shape and sharp broken edges. Therefore, we conclude that: the Ed2L and Ng sandstones of Well KL6-6-A were near-source deposited, their parent rocks were the adjacent Cretaceous basement of the Qingshan Formation and did not expand to the onshore areas such as the northern Shandong province, the Changdao Island in Penlai and the Qimu Island in Longkou at that time.

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备注/Memo

备注/Memo:
*“十三五”国家科技重大专项“渤海海域勘探新领域及关键技术研究(编号:2016ZX05024-003)”部分研究成果。 第一作者简介: 赵梦,女,博士,工程师,主要从事沉积学、地质学研究。地址:天津市滨海新区海川路2121号B座(邮编:300459)。E-mail:zhaomeng5@cnooc.com.cn。
更新日期/Last Update: 1900-01-01