珠江口盆地白云凹陷古近纪构造特征及勘探意义

王福国; 徐乐意; 郑金云; 贾富昊; 苏海霞; 汪晓萌; 沈传波

doi:10.3799/dqkx.2026.160

Volume 51 Issue 5

May 2026

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Article Navigation > Earth Science > 2026 > 51(5): 1982-1996

Wang Fuguo, Xu Leyi, Zheng Jinyun, Jia Fuhao, Su Haixia, Wang Xiaomeng, Shen Chuanbo, 2026. Paleogene Structural Characteristics and Exploration Significance of Baiyun Sag in Pearl River Mouth Basin. Earth Science, 51(5): 1982-1996. doi: 10.3799/dqkx.2026.160

Citation:

Wang Fuguo, Xu Leyi, Zheng Jinyun, Jia Fuhao, Su Haixia, Wang Xiaomeng, Shen Chuanbo, 2026. Paleogene Structural Characteristics and Exploration Significance of Baiyun Sag in Pearl River Mouth Basin. Earth Science, 51(5): 1982-1996. doi: 10.3799/dqkx.2026.160

Citation:

Wang Fuguo, Xu Leyi, Zheng Jinyun, Jia Fuhao, Su Haixia, Wang Xiaomeng, Shen Chuanbo, 2026. Paleogene Structural Characteristics and Exploration Significance of Baiyun Sag in Pearl River Mouth Basin. Earth Science, 51(5): 1982-1996. doi: 10.3799/dqkx.2026.160

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Paleogene Structural Characteristics and Exploration Significance of Baiyun Sag in Pearl River Mouth Basin

doi: 10.3799/dqkx.2026.160

Wang Fuguo^{1, 2
,
,},
Xu Leyi^{1, 2},
Zheng Jinyun^{1, 2},
Jia Fuhao^{1, 2},
Su Haixia^{1, 2},
Wang Xiaomeng^{1, 2},
Shen Chuanbo^{3
,
,
,}

1.
CNOOC China Limited, Shenzhen Branch, Shenzhen 518054, China
2.
Deepwater Development Co., Ltd.CNOOC, Zhuhai 519050, China
3.
School of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, China

Received Date: 2026-03-20
Publish Date: 2026-05-25

Abstract

Abstract

The Baiyun sag is the forefront of deep-water oil and gas exploration in China. Due to the weak deep reflection signal of seismic data, local shallow gas shielding and trench influence, the deep architecture and structure of Paleogene are not clearly understood, which affects the process of oil and gas exploration. Based on this, the PSDM reprocessing of the unified seismic data in the whole sag was carried out. The new data basically eliminated the influence of shallow gas and trenches, as a result, the deep imaging was significantly improved, and the identifiable low-frequency events increased clearly. Based on the new seismic data, a comprehensive analysis of the deep key interface characteristics, tectonic layers, structural zoning and crustal rupture process was carried out. The study shows that there are four types of six regional unconformity interfaces developed from bottom to top before the sedimentary period of Zhujiang Formation. The Paleogene can be divided into five sets of structural layers from bottom to top. According to the difference of fault development mode and basement uplift position, Baiyun sag can be divided into three structural areas. According to the temporal and spatial evolution characteristics of the unconformity surface, seven tectonic episodes are divided (balanced extension episode, lower crust extension episode, lithosphere extension episode, three episodes of mantle exhumation in different directions and the drift episode that eventually forms the marginal sea). By analogy with the oil and gas accumulation conditions in Kaiping sag, it is speculated that the fourth member of Wenchang Formation developed in the lower crust extension period of Baiyun sag is the main source rock, which has important exploration prospects. The study reasonably explains the genesis of complex structures in Baiyun sag, provides a new structural framework for Paleogene tectonic evolution and sedimentary system migration and evolution, and also provides a new idea for the comparative study of other sags in the northern continental margin basin of the South China Sea, which is of great significance for deep-water oil and gas exploration.
- structure,
- unconformity,
- structural evolution,
- Baiyun sag,
- Paleogene,
- Pearl River Mouth basin,
- petroleum geology

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References(47)

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Paleogene Structural Characteristics and Exploration Significance of Baiyun Sag in Pearl River Mouth Basin

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