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

被引：1
作者：
Wang J. [1 ]
Pang X. [3 ]
Wang H. [2 ]
Liu B. [3 ]
Chen X. [2 ]
机构：
[1] Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan
[2] School of Earth Resources, China University of Geosciences, Wuhan
[3] Shenzhen Branch of CNOOC Limited, Shenzhen
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2024年 / 49卷 / 01期
关键词：
Baiyun Sag; bottom current-reworking process; Bouma Sequence; gravity flow; Miocene; Pearl River Mouth Basin; sedimentology; submarine fan;
D O I：
10.3799/dqkx.2022.334
中图分类号：
学科分类号：
摘要：
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. © 2024 China University of Geosciences. All rights reserved.
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页码：71 / 83
页数：12
相关论文
共 37 条
  • [1] Bouma A.H., Sedimentology of Some Flysch Depos⁃ its: A Graphic Approach to Facies Interpretation, (1962)
  • [2] Breien H., de Blasio F. V., Elverhoi A., Et al., Transport Mechanisms of Sand in Deep-Marine Environ⁃ ments: Insights Based on Laboratory Experiments, Jour⁃ nal of Sedimentary Research, 80, 11, pp. 975-990, (2010)
  • [3] Cai L.L., Liu C.C., Lu M., Et al., The Develop⁃ ment Characteristics of Deep Water Channel and Sedi⁃ mentary Reservoir Prediction in Lower Congo Basin, West Africa, China Offshore Oil and Gas, 28, 2, pp. 60-70, (2016)
  • [4] Catuneanu O., Principles of Sequence Stratigraphy, pp. 105-245, (2006)
  • [5] Haq B. U., Hardenbol J., Vail P. R., Chronology of Fluctuating Sea Levels since the Triassic, Science, 235, 4793, pp. 1156-1167, (1987)
  • [6] He W.J., Xie J.Y., Liu X.Y., Et al., Foraminiferal Biostratigraphy and Sedimentary Environment Recon⁃ struction Based on Paleontological Data from Bore Hole DF1-1-11, Yinggehai Basin, Journal of Stratigraphy, 35, 1, pp. 81-87, (2011)
  • [7] He Y.B., Gao Z.Z., Li J.M., Et al., Internal-Tide Deposits of the Late Ordovician in Tonglu, Zhejiang, Acta Sedimentologica Sinica, 16, 1, pp. 1-7, (1998)
  • [8] Huang Y.T., Wen L., Yao G.Q., Et al., Sedi⁃ mentary Characteristics of Thick Fine-Grained Shal⁃ low-Marine Gravity Flow Deposits from Huangliu For⁃ mation in Dongfang Area, Yinggehai Basin, China, Acta Petrolei Sinica, 39, 3, pp. 290-303, (2018)
  • [9] Huang Y.T., Yao G.Q., Zhu H.T., Et al., Re⁃ working of Gravity Flow Sandbody by Bottom-Current from Huangliu Formation in Dongfang Area of Yinggehai Basin, Northwestern South China Sea, Acta Petrolei Sinica, 37, 7, pp. 855-866, (2016)
  • [10] Li Y., Zheng R.C., Zhu G.J., Et al., Deep-Water Tractive Deposition in Zhujiang Formation Baiyun Sag, Zhujiang River Mouth Basin and Its Geological Implica⁃ tions, Acta Oceanologica Sinica, 34, 1, pp. 127-135, (2012)
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