珠江口盆地韩江-陆丰凹陷珠江组下段碎屑锆石来源与储层物源示踪

doi:10.11743/ogg20180204

Abstract

Abstract: High-quality reservoirs in the Lower Zhujia Formation in eastern Pearl River Mouth Basin have trigged many disputes over their provenance distribution patterns and lithologies.As an attempt to dispel the doubts over the issue,we performed U-Pb dating on some detrital zircons in sandstone samples from the Lower Zhujiang Formation in the Lower Miocene of 7 different structural zones in eastern Pearl River Mouth Basin with LA-ICP-MS dating technology.The results show that the zircons were mostly magmatic origin,followed by metamorphic origin.The zircons of magmatic origin showed up during four age intervals:98-114,137-163,211-247 and 387-428 Ma.By comparing the ages of the zircons with those of potential provenance rocks and combining the age spectrum,we suggest that there were at least 4 water systems serving as detrital material providers during the early Zhujiang time of the Early Miocene.Hanjiang provenance was the source of sediments in Haifeng 28 and Lufeng 2 structural zones,Dongsha uplift provenance provided sediments for Lufeng 22 structural zone,Shanwei provenance generated materials for Huizhou 10 structural zone and joined Zhujiang provenance at Huizhou 08 structural zone,and Dongsha uplift provenance,possibly together with Hanjiang provenance,provided materials for Lufeng 13 structural zone.Based on the above analyses,we propose that Hanjiang-Lufeng area,with favorable geological conditions for the formation of shallow and medium to deep reservoirs,be the key future exploration target in Pearl River Mouth Basin.

Key words: zircon U-Pb dating, provenance, Lower Zhujiang Formation, Hanjiang-Lufeng Sag, Pearl River Mouth Basin

CLC Number:

TE122.2

Jiao Peng, Guo Jianhua, Wang Xikai, Liu Chensheng, Guo Xiangwei. Detrital zircon genesis and provenance tracing for reservoirs in the Lower Zhujiang Formation in Hanjiang-Lufeng Sag,Pearl River Mouth Basin[J]. Oil & Gas Geology, 2018, 39(2): 239-253.

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Detrital zircon genesis and provenance tracing for reservoirs in the Lower Zhujiang Formation in Hanjiang-Lufeng Sag,Pearl River Mouth Basin

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[10]	Yang Lu, Wang Yingmin, He Min, Chen Weitao, Xu Shaohua, Zhuo Haiteng, Wang Xingxing, Li Wenjing. Differential deposition and controlling factors of deep-water fan around 13.8 Ma in the Baiyun Sag,Pearl River Mouth Basin [J]. Oil & Gas Geology, 2018, 39(4): 791-800.
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