Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 61-69.doi: 10.12108/yxyqc.20230406

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

A layered velocity modeling method for elastic wave full waveform inversion based on improved conjugate gradient method

WANG Lide1, WANG Xiaowei1, ZHOU Hui2, WU Jie1, ZHANG Zhiqiang3, WANG Jianle1, WANG Deying1, FENG Gang1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. China University of Petroleum(Beijing), Beijing 102249, China;
    3. Gas Production Company, PetroChina Daqing Oilfield Company, Daqing 163000, Heilongjiang, China
  • Received:2022-09-26 Revised:2022-10-28 Online:2023-07-01 Published:2023-07-01

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Abstract: Due to the lack of low-frequency information and complex wave field of land seismic data， the nonlinearity of elastic wave full waveform inversion is aggravated. A layered inversion strategy of time-domain multiscale inversion was proposed to reconstruct the P-wave and S-wave velocity based on the improved conjugate gradient method. The results show that： （1）Time window was used to screen the early arrival wave information and to constrain the offset size to reconstruct the velocity field in the shallow area from low frequency to high frequency， which can reduce the strong nonlinear effects caused by the reflected waves and noises in the middle and deep layers. The shallow velocity was fixed，and the full offset data of full wave field was used to conduct multi-scale inversion for the middle and deep layer velocity.（2）The whole inversion process used the improved conjugate gradient method based on moving weighted average to update the P-wave and S-wave velocity iteratively. The improved conjugate gradient method can enhance the stability of inversion， improve the quality of deep velocity modeling，and increase the convergence speed. The layered inversion strategy can reduce the amount of calculation and ensure the accuracy of wave field simulation by using staggered grid finite difference method with different mesh size， and improve the calculation efficiency of inversion. The layered inversion strategy based on the improved conjugate gradient can effectively reduce the nonlinear impact of the onshore actual data，making the common imaging point gathers flattened better and the velocity reconstructed more precise.

Key words: time domain, elastic wave, full waveform inversion, multi scale, conjugate gradient, layered inversion, finite difference, velocity modeling

CLC Number: 

  • TE319
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