Pliocene channel sedimentary system influenced by contour currents in the Beijiao Sag, Qiongdongnan Basin

Li Yufeng; Pu Renhai; Fan Xiaowei; Zhang Gongcheng; Zhao Xueqin; Bao Jingjing; Li Yamo; Wang Jiong

doi:10.12284/hyxb2022116

Volume 44 Issue 10

Oct. 2022

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Li Yufeng，Pu Renhai，Fan Xiaowei, et al. Pliocene channel sedimentary system influenced by contour currents in the Beijiao Sag, Qiongdongnan Basin[J]. Haiyang Xuebao，2022, 44(10)：80–89 doi: 10.12284/hyxb2022116

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Pliocene channel sedimentary system influenced by contour currents in the Beijiao Sag, Qiongdongnan Basin

doi: 10.12284/hyxb2022116

1.
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
2.
State Key Laboratory of Continental Dynamics, Department of Ueology, Northwest University, Xi’an 710069, China
3.
Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou 510075, China
4.
Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an 710075, China
5.
CNOOC Research Institute Co., Ltd., Beijing 100027, China
6.
Laboratory of Ocean and Coast Geology, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
7.
Sichuan Engineering Technical College, Deyang 618030, China
8.
Central Sichuan Division, Petro China Southwest Oil & Gas Field Company, Suining 629200, China

Received Date: 2021-04-14
Rev Recd Date: 2022-02-11

Available Online: 2022-04-25

Publish Date: 2022-10-01

Abstract

Abstract

Depositional characteristics and process of deep-water channel sedimentary system influenced by contour currents is a current hotspot and new scientific issue in the study of deposits resulted from interaction between contour currents and turbidity flows. Using root mean square (RMS) attribute, coherenceseismic attribute, time structure and stratal slice, we focus on depositional characteristics and process of the channel sedimentary system in Pliocene strata in the Beijiao Sag, Qiongdongnan Basin. The results show that the channel sedimentary systems are divided into the early and late channel sedimentary systems. The depositonal units of the early system include channel, flake-shaped and fan-shaped overbank deposits. The units of the late systems incorporate: channel and flank-shaped overbank deposits. Fan-shaped overbank deposits are only distributed on the right side of the bend of the channel. Flake-shaped overbank deposits are only located on the left side of the channel. The channels are persistently oblique to the strike of the slope and they are symmetrical and characterized by vertical aggradations. Combined with the development features of mounded drifts and moats over the Beijiao uplift, it is inferred that the geometry of the channel sedimentary systems are mainly controlled by depositional products of the interaction between turbidity flows and contour currents. Contour currents flow across channels, forcing the upper part (low velocity and low density) of turbidity flows to deflect towards the left (downstream) side of channels and then form overspill currents. The direction of overspills is the same to that of contour currents, in this case, generating wide flake-shaped overbank deposits extending for several kmlometers. In the bend of channels, the direction of overspill currents is in contrast to that of contour currents, blocking or confining the range of the overbank deposits and then creating fan-shaped overbank deposits. This result are consistent with the previous results of flume-tank experiment.
- Bejiao Sag,
- channel sedimentary system,
- overbank deposits,
- contour currents,
- turbidity flows

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