Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (4): 147-158.doi: 10.12108/yxyqc.20250414

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics of sequence stratigraphy and main controlling factors for reservoir development of Lower Ordovician in Xishui area， southeastern Sichuan Basin

CHEN Yuhua1,2, SHI Zejin1,2, LI Wenjie1,2, YI Yongjie1,2, LIU Heng1,2, TIAN Yaming1,3, TAN Qian1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. College of Energy(College of Modern Shale Gas industry), Chengdu University of Technology, Chengdu 610059, China;
    3. College of International Research Center for Planetary Science, Chengdu University of Technology, Chengdu 610059, China
  • Received:2025-02-10 Revised:2025-03-28 Published:2025-07-05

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Abstract: Based on the observation of field outcrops and thin sections，the types of rock microfacies of Lower Ordovician Tongzi Formation and Honghuayuan Formation in Xishui area of southeastern Sichuan Basin were identified. The sedimentary environment was determined by rock microfacies assemblages，and the characteristics of sedimentary evolution were revealed. Controlling effects of sedimentary environment and different levels of sea-level changes on reservoirs were discussed. The results show that： （1）Thirteen rock microfacies types are developed in Lower Ordovician Tongzi Formation and Honghuayuan Formation in Xishui area of southeastern Sichuan Basin，which can be divided into five sedimentary subfacies： tidal flats，lagoons，shoals，intershoal seas， and intra-platform depressions.（2）There are three third-order sequences（SQ1-SQ3 from bottom to top）in Lower Ordovician Tongzi Formation and Honghuayuan Formation，each of which consists of one retrogradational and three progradational fourth-order sequences. During SQ1 period，the environment gradually changed from open platform to restricted platform，with three sedimentary sequences： shoals-intershoal seas，lagoonstidal flats-shoals，and tidal flats-shoals. During SQ2 period，it was restricted platform environment，with two sedimentary sequences： lagoons-shoals and lagoons-shoals-tidal flats. During SQ3 period，it was open platform environment，with three sedimentary sequences： shoals-intra-platform depressions，intra-platform depressionsshoals，and intershoal seas-shoals.（3）Shoals and tidal flats in the restricted platform of Lower Ordovician in the study area are the most favorable sedimentary subfacies for reservoir development. Influenced by the dissolution and dolomitization of syngenetic-early diagenetic stage under different levels of sea-level，multiple sets of reservoirs are vertically superimposed and concentratedly developed in the second to third progradational fourth-order sequences of SQ1 highstand systems tract and the first to third progradational fourth-order sequences of SQ2 highstand systems tract，especially in the upward-shallowing cycles where the shoals and tidal flats are superimposed in the restricted platform.The study areas can form large-scale reservoirs and has certain exploration potential.

Key words: rock microfacies, sequence boundary, restricted platform shoal, tidal flat, sea-level change, Tongzi-Honghuayuan Formations, Ordovician, Xishui area, southeastern Sichuan Basin

CLC Number: 

  • TE121.3
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