Temporal and spatial evolution and genetic mechanism of shallow continental shelf sandbodies in the northwestern Zhusan Depression

Song Guangzeng; Li Ming; Zhang Shuai; Yan Detian; Liu Entao; Chen Si

doi:10.12284/hyxb2023017

Volume 45 Issue 2

Feb. 2023

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Song Guangzeng，Li Ming，Zhang Shuai, et al. Temporal and spatial evolution and genetic mechanism of shallow continental shelf sandbodies in the northwestern Zhusan Depression[J]. Haiyang Xuebao，2023, 45(2)：62–73 doi: 10.12284/hyxb2023017

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Temporal and spatial evolution and genetic mechanism of shallow continental shelf sandbodies in the northwestern Zhusan Depression

doi: 10.12284/hyxb2023017

1.
School of Water Conservancy and Environment, University of Jinan, Ji’nan 250022, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Hainan Branch of China National Offshore Oil Corporation Limited, Haikou 570300, China

Received Date: 2022-05-29
Rev Recd Date: 2022-08-14

Available Online: 2022-11-24

Publish Date: 2023-02-01

Abstract

Abstract

In order to clarify the genetic mechanism of shallow continental shelf sandbodies in the upper submember of the first member of Zhujiang Formation in the northwestern Zhusan Depression, with integrated use of geological and geophysical data, the five-order sequence framework was established firstly, inside of which, the shallow continental shelf sandbodies were identified and quantitatively described, and the temporal and spatial evolution of the shallow continental shelf sandbodies were analyzed, and the genetic mechanism was discussed. The results show that: (1) The upper submember of the first member of Zhujiang Formation in the study area can be divided into four five-order sequences, which were numbered as FS4, FS3, FS2 and FS1 from bottom to top. (2) There are two types of shelf sand bodies: tidal sand ridge and offshore sand bar, which are distributed in NW−SE direction. Tidal sand ridges are mainly distributed in the west of the study area, while offshore sand bars are concentrated in the east. (3) In the three five-order sequences FS4, FS3 and FS2, the scale and quantity of both tidal sand rdiges and offshore sand bars are relatively large, while in the upper five-order sequence FS1, the scale and quantity present poor. (4) Sedimentary base level (hydrodynamic condition), synsedimentary geomorphology and sediment debris supply jointly affected the development scale, distribution characteristics and temporal and spatial evolution of tidal sand ridges and offshore sand bars, which comprehensively constituted the genetic mechanism of shallow continental shelf sand bodies in the northwestern Zhusan Depression.
- shallow continental shelf sandbody,
- subtle trap,
- high frequency sequence,
- base-level cycle,
- Zhusan Depression

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