Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (4): 159-168.doi: 10.12108/yxyqc.20250415

• PETROLEUM EXPLORATION • Previous Articles    

Paleogeomorphological characteristics of Oligocene Dongying period in southern Liaozhong Sag and its control on sedimentary system

LIU Xiumei1,2, XIN Renchen1,2, LIU Hao1,2   

  1. 1. School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China;
    2. Key Laboratory of Polar Geology and Marine Mineral Resources(China University of Geosciences, Beijing) Ministry of Education, Beijing 100083, China
  • Received:2024-08-01 Revised:2025-02-21 Published:2025-07-05

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Abstract: Paleogeomorphology is the foundation of the study of sedimentary filling process and dynamic background in basins. Based on the data of core， well logging， master logging and 3D seismic， the structural sedimentology and seismic sedimentology were applied to reconstruct the paleogeomorphology and analyze the sedimentary facies of Oligocene Dongying Formation in southern Liaozhong Sag，and the control of paleogeomorphology on sedimentation was clarified. The results show that： （1）Dongying Formation in southern Liaozhong Sag develop four types of structural geomorphic units： uplift zone，slope zone，shallow subsag zone and deep subsag zone. The geomorphic units are controlled by fault slope-break zones，showing an overall feature of“east-west zoning and north-south blocking”.（2）Dongying Formation in the study area mainly develops braided river delta，meandering river delta，anastomosing river delta，sublacustrine fan and lake.The types and distribution of sedimentary facies are obviously controlled by paleogeomorphology： During the sedimentary period of ESTd3-ESTd2，the rifting process was strong. During the lacustrine expansion period，the Liaoxi low uplift and the south bulge rise were the main provenance areas，and the subsag area received near-source deposits，which controlled the development of braided river delta. During the sedimentary period of HSTd3，along with the elevation of lake level，the uplift area transformed into underwater low uplift，and shore-shallow lake beach-bar sand deposits were developed. During the sedimentary period of HSTd2-SQd1，the fault activity weakened，and the pre-existing paleo-uplift transformed into underwater low uplift. The two strip-shaped subsag zones in northeast-southwest direction provided important geomorphic background for the development of the distal meandering river delta.

Key words: paleogeomorphology, fault slope-break zone, sedimentary system, river delta, sublacustrine fan, Dongying period, Oligocene, Liaozhong Sag

CLC Number: 

  • TE121
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