Variability in Sequence Stratigraphic Architectures of Lower-Middle Miocene Pearl River Delta, Northern Enping Sag, Pearl River Mouth Basin: Implications for Lithological Trap Development

被引：0
|
作者：
Gao Y. [1 ]
Zhang X. [1 ]
Li Z. [1 ]
Ding L. [1 ]
Li X. [1 ]
机构：
[1] Shenzhen Branch, China National Offshore Oil Corporation Limited, Shenzhen
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 05期
关键词：
Ancient Pearl River delta; Enping sag; Miocene; Pearl River Mouth basin; Sequence stratigraphic architecture; Stratigraphy;
D O I：
10.3799/dqkx.2021.011
中图分类号：
学科分类号：
摘要：
In view of the theory and application of sequence stratigraphy in the marine deltaic facies, in this paper it selects the Lower-Middle Miocene (T50-T35) acient Pearl River delta in the north of the Enping sag, Pearl River Mouth basin as the target to carry out detailed anatomy. On the basis of digesting and absorbing the latest development of "depositional sequence" theory, combined with the development characteristics of ancient Pearl River delta and well seismic data conditions, a high-frequency sequence stratigraphic scheme is proposed on the basis of four types of surfaces, namely the sequence boundary (SB), maximum regressive surface (MRS), maximum flooding surface (MFS) and high-order flooding surface (FS). The results reveal that the most striking feature of the sequence stratigraphy of this area is the extensive development of the lowstand systems tracts. Constrained by the high-resolution sequence framework, the seismic sedimentology technology is further used to carry out the fine sedimentary analysis. The results show that the lowstand systems tracts in the study area are mainly composed of large intersecting braided channels, with large thickness and continuous distribution of sand bodies. In contrast, the sand content of transgressive and highstand systems tracts is obviously lower, with sinuous, low-energy river channel or shore-parallel bars as the main body, signifying greater lithologic traps potential. In addition, combined with the results of sequence architecture classification, it is proposed that the sixth member of Hanjiang Formation and the first member of Zhujiang Formation, which are dominated by A-type sequence architecture (highstand systems tracts dominated), have great lithologic trap potential. The conclusions of this study have certain guiding significance for the exploration of lithologic traps in the Pearl River Mouth basin and other marine basins. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：1758 / 1770
页数：12
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