Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 1-13.doi: 10.12108/yxyqc.20190601

• PETROLEUM GEOLOGY •     Next Articles

Seismic subtle sequence boundary identification,high-frequency sequence framework establishment and lithologic trap exploration: a case study of Jurassic to Cretaceous in the western margin of Turpan-Kumul Basin

YANG Zhanlong1,2, SHA Xuemei1,2, WEI Lihua1,2, HUANG Junping1,2, XIAO Dongsheng3   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
    3. Research Institute of Exploration and Development, PetroChina Tuha Oilfield Company, Kumul 839009, Xinjiang, China
  • Received:2019-05-08 Revised:2019-05-08 Online:2019-11-21 Published:2019-09-28

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Abstract: Focusing on the facts that the type and accuracy of sequence boundaries identified on seismic is lower than that on logging and the established sequence framework cannot favorably meet the needs of lithologic reservoir exploration,a method of seismic subtle sequence boundary identification and high-frequency sequence framework establishment was proposed based on logging-seismic time-frequency matching analysis and seismic all-reflector tracking. Technically,it involves the time-frequency analysis of logging,logging calibration to seismic and seismic all-reflector tracking based on seismic time-frequency analysis,and the relationship of seismic reflection cycles matching to logging was obtained and the high-resolution spatial sequence framework was established. The sequence boundaries within this framework not only have clear geological meanings of sedimentary cycles,but also have high resolution. It can effectively identify the subtle sequence boundary which is difficult to be recognized by conventional method,and favorably meet the accuracy requirements for lithologic trap identification and description in sequence stratigraphy study. The Jurassic in the western margin of Turpan-Kumul Basin demonstrated the application of this method and good result was achieved. It is helpful for tapping the potential of seismic interpretation,high-resolution sequence stratigraphy study and lithologic reservoir exploration.

Key words: subtle sequence boundary, high-frequency sequence framework, time-frequency analysis, all-reflector tracking, logging matching to seismic, lithologic trap

CLC Number: 

  • TE121.3
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