珠江口盆地荔湾凹陷珠江组关键地质界面SB21的识别及地质意义

刘思青; 张翠梅; 孙珍; 庞雄; 申俊; 邱宁

doi:10.3799/dqkx.2016.039

Volume 41 Issue 3

Mar. 2016

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Article Navigation > Earth Science > 2016 > 41(3): 475-486

Liu Siqing, Zhang Cuimei, Sun Zhen, Pang Xiong, Shen Jun, Qiu Ning, 2016. Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin. Earth Science, 41(3): 475-486. doi: 10.3799/dqkx.2016.039

Citation:

Liu Siqing, Zhang Cuimei, Sun Zhen, Pang Xiong, Shen Jun, Qiu Ning, 2016. Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin. Earth Science, 41(3): 475-486. doi: 10.3799/dqkx.2016.039

Citation:

Liu Siqing, Zhang Cuimei, Sun Zhen, Pang Xiong, Shen Jun, Qiu Ning, 2016. Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin. Earth Science, 41(3): 475-486. doi: 10.3799/dqkx.2016.039

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Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin

doi: 10.3799/dqkx.2016.039

Liu Siqing^{1,2
,},
Zhang Cuimei^{1
,
,},
Sun Zhen¹,
Pang Xiong³,
Shen Jun³,
Qiu Ning¹

1.
Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
CNOOC Ltd. Shenzhen, Guangzhou 510240, China

Received Date: 2015-07-15
Publish Date: 2016-03-15

Abstract

Abstract

Liwan sag is an ultra deep water sag in the southernmost of the Pearl River Mouth Basin (PRMB), whose structural characteristics and sedimentary process is the important part of passive margin evolution. Using seismic stratigraphy, structures and sedimentation analysis were carried out on high-resolution 2D/3D seismic data in the Liwan Sag of the PRMB. A significant geological boundary with obvious characteristics in the Zhujiang Formation could be identified and traced—SB21. Above the sequence boundary, four types of deposition were identified: the denudation zone in the north, the sediment passing zone in the central-north, the superimposition zone of sediment waves over gulliesin the central-south, the sediment accumulation zone in the South. It's suggested that the various depositional pattern has a close relationship with the tectonic movement—Baiyun Movement—which happened in 23.8 Ma. The tectonic movement caused the differential subsidence of Liwan Sag. Accelerated subsidence happened in the central and south of the sag, and the relative uplift in the north and east. The former sedimentation equilibrium was destroyed and led to redistribution of the sediments. Sediments migrate from the northern denudation zone and migrated along the passing zone and finally deposited at the accumulation zone. We inferred that the gullies which move from east to the west were related to the differential subsidence during this period. The differential subsidence caused topographic gradient change between the NS-trending uplift and the sag center. The study of the sedimentary reflection characteristics at the boundary SB21 reveals the complicated sedimentary process and its driving mechanism in ultra deep water area, which will make great contibution to the tectonic sedimentary process in larger areas.
- Zhujiang Formation,
- gully,
- sediment wave,
- submarine fan,
- Liwan sag,
- Pearl River Mouth Basin,
- marine geology

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References(45)

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Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin

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