|本期目录/Table of Contents|

[1]张丽丽 舒梁锋 冯 轩 于 飒 吴婷婷.再论珠江口盆地恩平组时代归属[J].中国海上油气,2020,32(05):9-18.[doi:10.11935/j.issn.1673-1506.2020.05.002]
 ZHANG Lili SHU Liangfeng FENG Xuan YU Sa WU Tingting.Further discussion on the age assignment of Enping Formation in the Pearl River Mouth basin[J].China Offshore Oil and Gas,2020,32(05):9-18.[doi:10.11935/j.issn.1673-1506.2020.05.002]
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再论珠江口盆地恩平组时代归属()

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

卷:
第32卷
期数:
2020年05期
页码:
9-18
栏目:
油气勘探
出版日期:
2020-09-25

文章信息/Info

Title:
Further discussion on the age assignment of Enping Formation in the Pearl River Mouth basin
文章编号:
1673-1506(2020)05-0009-10
作者:
张丽丽 舒梁锋 冯 轩 于 飒 吴婷婷
(中海石油(中国)有限公司深圳分公司 广东深圳 518054)
Author(s):
ZHANG Lili SHU Liangfeng FENG Xuan YU Sa WU Tingting
(CNOOC China Limited, Shenzhen Branch, Shenzhen, Guangdong 518054,China)
关键词:
珠江口盆地 恩平组 地层年代 孢粉组合 微体古生物
Keywords:
the Pearl River Mouth basin Enping Formation stratigraphic chronology Palynological assemblage micropaleontology
分类号:
P736.22
DOI:
10.11935/j.issn.1673-1506.2020.05.002
文献标志码:
A
摘要:
为解决珠江口盆地恩平组属于始新统还是上始新统—渐新统之争议,通过钻井岩性组合、地震反射特征及孢粉组合等确定了恩平组识别标志,综合利用钻井古生物、大洋钻探和深拖地磁等资料重新厘定了恩平组地质时代。恩平组以陆相沉积为主,岩性为砂泥岩互层,地震反射呈弱楔状、向缓坡收敛,与文昌组厚层泥岩夹砂岩、典型楔状地震反射特征不同,与珠海组厚层砂岩夹薄层泥岩、近平行地震反射特征有异; 恩平组孢粉组合总体特征与文昌组更为相似,以反映温暖气候环境的三沟类、三孔沟类花粉为主,恩平组与珠海组孢粉组合变化大,反映了气候由暖变冷。依据文昌组顶部碎屑锆石年龄测定和恩平组内含有典型晚始新世有孔虫等证据,确定恩平组底界地质年代为39 Ma±; 依据大洋钻探和深拖地磁资料、珠海组底部最古老微体化石年代、恩平组/珠海组孢粉组合记录所对应的全球E/O变冷事件(晚始新世末)等证据,综合判定恩平组顶界面形成地质年代为33~34 Ma
Abstract:
To resolve the dispute over the age assignment of Enping Formation in the Pearl River Mouth basin, lithological assemblages, seismic reflection characteristics and palynological assemblage in drilled holes are used to confirm the features of Enping Formation. The age is redefined by using the palaeobios from drilled holes, ODP and magnetic anomalies data. Unlike Wenchang Formation which has massive mudstone with interbedded sandstone and is featured by typical wedge shape seismic reflection, and Zhuhai Formation which has massive sandstone with interbedded thin mudstone and is characterized by near parallel seismic reflection, Enping Formation is dominated by continental sediments, lithology is sandstone-mudstone interlayers, and seismic reflection shows weak wedge shape and convergence towards gentle slope. The general characteristics of palynological assemblage of Enping Formation are more similar with those of Wenchang Formation, mainly reflecting pollens of 3-colpate and tricolporate types in warm climate environment. While palynological assemblages of Enping Formation and Zhuhai Formation vary greatly, indicating that the climate changed from warm to cold. Based on the determined age of detrital zircons in top Wenchang Formation and the appearance of typical late Eocene foraminifera in Enping Formation, the age of Enping bottom can be determined at 39 Ma±. The top boundary is determined to be formed during 33~34 Ma based on the ODP and magnetic anomalies data, age of the oldest microfossils at the bottom of Zhuhai Formation and the palynological assemblage in Enping and Zhuhai Formations corresponding to the E/O global cooling event(end of Late Eocene

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备注/Memo

备注/Memo:
收稿日期:2020-05-18 改回日期:2020-08-10 * “十三五”国家科技重大专项“南海东部海域勘探新领域与关键技术(编号:2016ZX05024-004)”“珠江口盆地陆缘深水区油气地质及勘探关键技术(编号:2016ZX05026-003)”部分研究成果。 第一作者简介: 张丽丽,女,工程师,主要从事地层对比及油气地质等方面的研究。地址:广东省深圳市南山区后海滨路(深圳湾段)3168号中海油大厦A座(邮编:518054)。E-mail:zhanglili@cnooc.com.cn。
更新日期/Last Update: 2020-09-20