Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 13-22.doi: 10.12108/yxyqc.20250302

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics of Triassic paleostructure and their control on sedimentation in Kuqa Depression，Tarim Basin

XIE Huiwen1,2,3, ZHANG Liang1,2,3, WANG Bin1,2,3, LUO Haoyu1,2,3, ZHANG Ke1,2,3, ZHANG Guowei1,2,3, LI Ling1,2,3, SHEN Lin1,2,3   

  1. 1. R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, Xinjiang, China;
    2. Engineering Research Center for Ultra-deep Complex Reservoir Exploration and Development, Xinjiang Uygur Autonomous Region, Korla 841000, Xinjiang, China;
    3. Xinjiang Key Laboratory of Ultra-deep Oil and Gas, Korla 841000, Xinjiang, China
  • Received:2024-06-29 Revised:2024-08-13 Published:2025-05-10

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Abstract: Based on the fine structural interpretation of seismic data，Triassic synsedimentary faults in Kuqa Depression of Tarim Basin were studied by using the impression method，and the pre-sedimentary paleomorphology of Triassic was restored，and their controlling effects on sedimentation were clarified. The results show that： （1）Triassic of Kuqa Depression develops four rows of synsedimentary reverse faults，including Kubei fault， Bashi-Yiqicreek fault，Kela-Yangbei fault and Keshen fault，which are structurally stacked，and the front zone reaches the south of Kelasu tectonic belt. （2） Triassic paleogeomorphology is distributed in an east-west direction，with the South Tianshan orogenic belt in the north and the foreland basin uplift in the south. The central part is the structural low part of Kuqa Depression，which is constrained by the local low bulge，and develops Wushi Sag，Baicheng Sag and Yangxia Sag. The northern boundary of the prototype basin is located 24-51 km north of the current basin boundary，and the area of the prototype basin is 11 913 km2 larger than that of the present basin.（3）The sedimentation and evolution of Triassic in the study area are controlled by the paleotectonic pattern，which is generally manifested as a wedge-shape that gradually thickening from south to north，with a tendency of thickening from west to east，and the distribution of strata in the north-south direction is asymmetrical. Due to the weakening orogeny of South Tianshan，Triassic has a complete foreland basin extrusion-relaxation pattern.Okhobrak Formation develops fan delta，the lower part of Karamay Formation and Huangshanjie Formation are semi-deep lake and deep lake sediments.The upper part of Huangshanjie Formation and Tarichik Formation are the transformation of the flood plain from the semi-deep lake and deep lake to the meandering river，which vertically constitutes a complete sedimentary cycle of continental lake basin evolution. The ascending walls of the syngenetic reverse faults all have the function of secondary provenance，and form a good spatial combination of reservoirs and caps in the lower wall，which is a favorable potential exploration field.

Key words: paleostructure, synsedimentary reverse faults, restoration of prototype basin, impression method, Triassic, Kuqa Depression, Tarim Basin

CLC Number: 

  • TE121.3
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