珠江口盆地白云凹陷中新统珠江组潮流改造的砂质海底扇沉积

王家豪; 庞雄; 王华; 柳保军; 陈鑫鑫

doi:10.3799/dqkx.2022.334

Volume 49 Issue 1

Jan. 2024

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Wang Jiahao, Pang Xiong, Wang Hua, Liu Baojun, Chen Xinxin, 2024. Tide Current-Reworked Sandy Submarine Fan Deposits in Miocene Zhujiang Formation, Baiyun Sag of Pearl River Mouth Basin. Earth Science, 49(1): 71-83. doi: 10.3799/dqkx.2022.334

Citation:

Wang Jiahao, Pang Xiong, Wang Hua, Liu Baojun, Chen Xinxin, 2024. Tide Current-Reworked Sandy Submarine Fan Deposits in Miocene Zhujiang Formation, Baiyun Sag of Pearl River Mouth Basin. Earth Science, 49(1): 71-83. doi: 10.3799/dqkx.2022.334

Citation:

Wang Jiahao, Pang Xiong, Wang Hua, Liu Baojun, Chen Xinxin, 2024. Tide Current-Reworked Sandy Submarine Fan Deposits in Miocene Zhujiang Formation, Baiyun Sag of Pearl River Mouth Basin. Earth Science, 49(1): 71-83. doi: 10.3799/dqkx.2022.334

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Tide Current-Reworked Sandy Submarine Fan Deposits in Miocene Zhujiang Formation, Baiyun Sag of Pearl River Mouth Basin

doi: 10.3799/dqkx.2022.334

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Shenzhen Branch of CNOOC Limited, Shenzhen 510240, China

Received Date: 2022-08-16
Available Online: 2024-01-24
Publish Date: 2024-01-25

Abstract

Abstract

Recently increasingly-identified shallow marine fans and bottom current-reworking processes, which bought challenge on traditional knowledge such as the item of deep-water fan and Bouma Sequence, are needed for further research. The Baiyun Sag of Pearl River Mouth Basin is an important area for oil and gas exploration of submarine fans. The Miocene sequence SQ21 in this sag, whose base was dated as 21 Ma, is the main stratum hosting sandy submarine fans and petroleum discoveries, so was taken as the object in this study. Integrating core observation with analyses of well logging motifs, seismic reflection configurations and seismic geomorphology, this study revealed a large number of submarine fans in the falling stage and lowstand systems tracts of SQ21. The fans are constructed by gravity flow channels, levees and sheet lobes, corresponding to high-amplitude strips and lobate shapes, respectively, in seismic root mean square amplitude attribute maps. At the upper continental slope, the channels were deposited with mainly massive medium- to fine-grained sandstone and ripple-laminated fine-grained sandstone to siltstone, presenting upward-fining successions. They are characterized by cylindrical- to bell-shaped logging motifs, channel-infilling seismic reflections. Further, ripple-laminated sandstone to siltstone is intercalated with a lot of mudstone laminae partly illustrating single-clay and double-clay structures. This, together with abundant biological burrows, disturbance structure and siderite nodule, indicates that sea level greatly fell below shelf break. Consequently, the sandy submarine fan deposits, which were generated with their gravity flow channels at the upper continental slope, had been severely reworked by tide current, while shallow sea environment gradually occurred at the upper continental slope along with sea level greatly falling till below the shelf break. In this study, the application of seismic geomorphological analyses guarantees correct identification of the tidal current-reworked submarine fans. Moreover, it is suggested that the Bouma Sequence can be resulted from bottom current-reworking processes, and term of deep-water fan should not be overused.
- Miocene,
- submarine fan,
- bottom current-reworking process,
- gravity flow,
- Bouma Sequence,
- Pearl River Mouth Basin,
- Baiyun Sag,
- sedimentology

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References(52)

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Tide Current-Reworked Sandy Submarine Fan Deposits in Miocene Zhujiang Formation, Baiyun Sag of Pearl River Mouth Basin

doi: 10.3799/dqkx.2022.334

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