Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 98-110.doi: 10.12108/yxyqc.20240110

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary facies distribution characteristics and sedimentary model of Triassic Baikouquan Formation in Shawan Sag，Junggar Basin

WANG Tianhai1,2, XU Duonian3, WU Tao4, GUAN Xin3, XIE Zaibo1,2, TAO Huifei1   

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    4. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2022-10-13 Revised:2022-11-08 Online:2024-01-01 Published:2024-01-02

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Abstract: The Triassic Baikouquan Formation in Shawan Sag of Junggar Basin mainly develops fan delta deposits. Accurately identifying the distribution characteristics of each sedimentary facies of the fan delta is of great significance for the exploration and development of multi-type oil and gas reservoirs. Combined with high-precision three-dimensional development seismic and a large number of drilling and logging data, the distribution characteristics of sedimentary facies of Baikouquan Formation in Shawan Sag were studied by means of sedimentary facies research, seismic attribute analysis and paleotopography restoration. The results show that:(1) Baikouquan Formation in Shawan Sag can be divided into three fourth-order sequences and several fifth-order sequences. The three fourth-order sequences correspond to three members of Baikouquan Formation, and the fifth-order sequences are controlled by short-term sedimentary cycles, corresponding to different sedimentary microfacies.(2) The root mean square amplitude attribute is more sensitive to the lithology change of the target layer. The high energy zones are expressed as fan delta plain subfacies, the middle energy zones are expressed as fan delta front subfacies, and the low energy zones are expressed as the shore shallow lake subfacies.(3) During the sedimentary period of the first and second members of Baikouquan Formation, the lake basin area of the study area is small, and the fan delta plain and front subfacies are mainly developed. During the sedimentary period of the third member of Baikouquan Formation, the lake basin area is expanded, and the fan delta front and shore-shallow lake subfacies are mainly developed, which is a typical transgressive retrograding fan delta. The fan delta front subfacies have good physical properties, and are covered by mudstone of shore-shallow lake subfacies, forming a good reservoircap assemblage.(4) The Baikouquan Formation in the study area has a large scale of fan bodies and close source rocks, with lithologies mainly of sandy conglomerate, which is a gentle slope shallow water fan delta sedimentary model. The front subfacies of fan delta are potential favorable reservoir accumulation areas, which are key exploration areas for the discovery of oil and gas resources.

Key words: fan delta, sandy conglomerate, paleotopography, sedimentary facies, gentle slope shallow water fan delta sedimentary model, Baikouquan Formation, Triassic, Shawan Sag, Junggar Basin

CLC Number: 

  • TE122.2
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