Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 70-78.doi: 10.12108/yxyqc.20230407

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

A strong seismic energy reduction method under compressed sensing

LI Shengjun1, GAO Jianhu1, ZHANG Fanchang2, HE Dongyang1, GUI Jinyong1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China
  • Received:2022-10-08 Revised:2022-12-04 Online:2023-07-01 Published:2023-07-01

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Abstract: Based on the compressive sensing（CS）theory and the wavelet interference mechanism between strong and weak reflections，a dynamic dictionary strong reflection decomposition method by approximating arbitrary strong reflection waveforms and a strong reflection reduction method based on shielding function were proposed. The validity of the methods was verified using numerical models and physical models with large lateral variations of strongly reflected waveforms. The methods have been practically applied in the second member of Permian Maokou Formation in the central uplift tectonic zone of central Sichuan Basin. The results show that：（1）Compared with the conventional de-strong reflection method，the strong reflection reduction method based on shielding function has better lateral continuity of the seismic event，the strong reflection event is more thoroughly reduced， and the weak reflection of the blocky sand body shielded by the strong reflection is revealed. At the same time， the method has low dependence on the horizon and can process the strong reflection within the time window at one time without accurate strong reflection horizon data.（2）The strong reflection reduction method based on shielding function has a better elimination effect when the distance between the sand body and the strong reflection layer is less than λ（wavelength）and greater than λ/4. The strong reflection can be completely removed and the weak reflection is completely revealed. When the distance between the sand body and the strong reflection layer is less than λ/4，the elimination effect is poor. When the distance between the sand body and the strong reflection layer is less than λ/8，the elimination effect is worse.（3）This method is better applied in the second member of Permian Maokou Formation in the central uplift tectonic zone of central Sichuan Basin. The weak reflection of the reservoir is revealed when the distance between the reservoir and the strong reflection layer is less than λ/4. The reservoir response is enhanced when the distance between the reservoir and the strong reflection layer is greater than λ/4.

Key words: strong reflection reduction, seismic signal decomposition, compressed sensing, shielding function, dynamic dictionary, signal enhancement, reservoir prediction

CLC Number: 

  • TE319
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