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DOI: https://doi.org/10.11698/PED.20220717

Diversity and origin of depositional architecture of sublacustrine fans during forced regression: A case study of Middle Sha 3 Member in Dongying Depression, Bohai Bay Basin, East China

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  • 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
    2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;
    3. School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

Received date: 2022-10-24

  Revised date: 2023-04-21

  Online published: 2023-05-31

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Abstract

Currently, the differences in gravity flow deposits within different systems tracts in continental lacustrine basins are not clear. Taking the middle third member of Shahejie Formation (Sha 3 Member) in the Shishen 100 area of the Dongying Depression, the Bohai Bay Basin, as an example, the depositional architecture of sublacustrine fans during forced regression and the impact of the fourth-order base-level changes on their growth were investigated using cores, grain-size curves, well logs and 3D seismic data. Sublacustrine fans were mainly caused by hyperpycnal flow during the fourth-order base-level rise, while the proportion of slump-induced sublacustrine fans gradually increased during the late fourth-order base-level fall. When the fourth-order base-level rose to fall, the motion distance of channels inside hyperpycnal-fed sublacustrine fans reduced progressively, resulting in the transformation in their morphology from a significantly channelized fan to a skirt-like fan. Furthermore, the depositional architecture of distributary channel complexes in sublacustrine fans changed from vertical aggradation to lateral migration, and the lateral size of individual channel elements steadily decreased. The outer-fan lobe complex’s architectural patterns evolved from compensational stacking of lateral migration to aggradational stacking, and the lateral size of individual lobe elements steadily grew. This study deepens the understanding of depositional features of gravity flow in high-frequency sequence stratigraphy and provides a theoretical foundation for the fine development of sublacustrine fan reservoirs.

Key words： Bohai Bay Basin; Dongying Depression; Paleogene Shahejie Formation; sublacustrine fan; hyperpycnal flow; channel; lobe; base-level; depositional architecture

Cite this article

WU Qianran, XIAN Benzhong, GAO Xianzhi, TIAN Rongheng, ZHANG Haozhe, LIU Jianping, GAO Yukun, WANG Pengyu . Diversity and origin of depositional architecture of sublacustrine fans during forced regression: A case study of Middle Sha 3 Member in Dongying Depression, Bohai Bay Basin, East China[J]. Petroleum Exploration and Development, 0 : 20230808 -20230808 . DOI: 10.11698/PED.20220717

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