南海万安盆地构造—层序发育特征与构造—沉积充填演化

肖鸿议; 何云龙; 解习农; 张道军; 陆必宇; 王亚辉; 杨允柳

doi:10.3799/dqkx.2021.064

Volume 46 Issue 9

Oct. 2021

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Article Navigation > Earth Science > 2021 > 46(9): 3338-3351

Xiao Hongyi, He Yunlong, Xie Xinong, Zhang Daojun, Lu Biyu, Wang Yahui, Yang Yunliu, 2021. Characteristics of Structural-Sequence and Evolution of Tectonic and Sedimentary of Wan'an Basin in South China Sea. Earth Science, 46(9): 3338-3351. doi: 10.3799/dqkx.2021.064

Citation:

Xiao Hongyi, He Yunlong, Xie Xinong, Zhang Daojun, Lu Biyu, Wang Yahui, Yang Yunliu, 2021. Characteristics of Structural-Sequence and Evolution of Tectonic and Sedimentary of Wan'an Basin in South China Sea. Earth Science, 46(9): 3338-3351. doi: 10.3799/dqkx.2021.064

Citation:

Xiao Hongyi, He Yunlong, Xie Xinong, Zhang Daojun, Lu Biyu, Wang Yahui, Yang Yunliu, 2021. Characteristics of Structural-Sequence and Evolution of Tectonic and Sedimentary of Wan'an Basin in South China Sea. Earth Science, 46(9): 3338-3351. doi: 10.3799/dqkx.2021.064

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Characteristics of Structural-Sequence and Evolution of Tectonic and Sedimentary of Wan'an Basin in South China Sea

doi: 10.3799/dqkx.2021.064

Xiao Hongyi^{1
,
,},
He Yunlong^{1, 2
,
,
,},
Xie Xinong^{1, 2},
Zhang Daojun³,
Lu Biyu¹,
Wang Yahui³,
Yang Yunliu¹

1.
Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
Zhanjiang Branch, CNOOC Limited Company, Zhanjiang 524057, China

Received Date: 2020-09-18
Available Online: 2021-10-14
Publish Date: 2021-10-14

Abstract

Abstract

The Wan'an basin is one of the most important sedimentary basins in the southwestern South China Sea. Based on 2D seismic data covering the whole basin,combined with the latest research results,this study analyzes the characteristics of tectonic-sequence and evolution of tectonics-sedimentary infillings of the Wan'an basin. In this study,8 major 2nd and 3rd order sequence boundaries have been identified in the Wan'an basin. Further subsidence simulation shows that the overall feature of subsidence rate of the basin shows a "high-low-high" process,with rough characteristics of higher in the east and lower in the west,higher in the north and lower in the south. Combined tectonic-sequences and simulation results of subsidence,evolution of tectonic-sedimentary infillings of Wan'an basin since Cenozoic can be divided into five stages,which are early rifting stage,late rifting stage,rifting-post rifting transitional stage,thermal subsidence stage and accelerated thermal subsidence stage. Since the formation of the basin,the subsidence has mainly been affected by the deep faults caused by the extension of the East Asian continental margin. In Pliocene,the Wan'an fault became the main influencing factor of the basin subsidence,which resulted in the early migration of the basin subsidence center from the middle to the west,and then gradually to the east. From Oligocene to Early Miocene,the basin was in rifting stage,which was dominated by terrigenous clastic deposits. In Middle Miocene,the basin was in rifting-post rifting transitional stage and thermal subsidence has begun since Late Miocene. In these two stages,except for clastic deposits,carbonate deposits were also developed. In addition,compared to transitional stage,carbonate deposits in the thermal subsidence stage were relatively reduced,and the terrigenous clastic deposits were relatively expanded.
- South China Sea,
- Wan'an basin,
- tectonic-sequence,
- subsidence simulation,
- depositional center,
- tectono-sedimentary evolution,
- petroleum geology

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References(57)

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