Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 122-132.doi: 10.12108/yxyqc.20250511

• PETROLEUM EXPLORATION • Previous Articles    

Paleogeomorphy restoration of Permian-Jurassic and its hydrocarbon implications in Junggar Basin，NW China

YE Hui1,2, ZHU Feng3, WANG Guizhong3, SHI Wanzhong1,2, KANG Xiaoning3, DONG Guoning1,2, Naziyiman3, WANG Ren1,2   

  1. 1. School of Earth Resources, China University of Geosciences, Wuhan 430074, China;
    2. Key Laboratory of Tectonics and Petroleum Resources, of Ministry of Education, China University of Geosciences, Wuhan 430074, China;
    3. Urumqi Branch of BGP INC., CNPC, Urumqi 830016, China
  • Received:2025-02-22 Revised:2025-04-16 Published:2025-09-06

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Abstract: Based on the identification of Permian-Jurassic unconformity in Junggar Basin，the erosion amount was estimated through a combination of stratigraphic trend analysis and sedimentation rate methods. Then paleogeomorphology was characterized using impression method，and the impact of ancient landform evolution characteristics on oil and gas accumulation was analyzed. The results show that：（1）Three first-order unconformities（C/P，P/T，J/K）and three second-order unconformities（P1/P2，P2/P3，T/J）can be identified in PermianJurassic of Junggar Basin. The denudation area of Permian is mainly located in the southeast and northwest of Zhongguai uplift and Dabasong uplift，with a small amount of denudation in the eastern uplift zone. The denudation area of Triassic is mainly located in the northwest margin of the basin，while the denudation area of Jurassic is mainly located in Chepaizi-Mosowan paleo-uplift and the eastern part of the basin.（2）In the study area，Early Permian showed fault depression，normal faults controlled the west and the strata terminated，the eastern strata overlaid on the slope，and Middle-Late Permian presented a multi-depositional center pattern of uplift and depression. Triassic experienced overall subsidence，with three relatively large sedimentary centers. In Early-Middle Jurassic period，the terrain was flat with minimal topographical fluctuations. During Middle-Late Jurassic，the southern part of the basin experienced severe subsidence due to tectonic activity，resulting in a topography characterized by high in the north and low in the south.（3）The evolution of Permian-Jurassic paleogeomorphology in the study area has a significant influence on the distribution of sand bodies and source rocks. The source rocks developed in the sedimentary center of Lower Permian basin and the glutenite in the uplift area formed a good near source source-reservoir combination. During Middle Permian，the rapid eastward expansion and the pattern of multiple sedimentary centers provided favorable conditions for the development of source rocks. The paleouplifts at the basin margin in Upper Permian significantly controlled the distribution of sand bodies. In Triassic， rapid basin subsidence led to the formation of a deep-water lake basin，depositing a thick layer of source rocks. The flat terrain during Middle-Lower Jurassic provided favorable conditions for coal seam development.

Key words: paleogeomorphology restoration, unconformity, erosion amount, sedimentation rate method, stratigraphic trend method, impression method, basin evolution, Permian-Jurassic, Junggar Basin

CLC Number: 

  • TE122
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