An Effective Acoustic Impedance Imaging Based on a Broadband Gaussian Beam Migration

Shaoyong Liu, Wenting Zhu, Zhe Yan, Peng Xu and Huazhong Wang
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Shaoyong Liu: Department of Applied Geophysics, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
Wenting Zhu: Department of Applied Geophysics, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
Zhe Yan: Department of Applied Geophysics, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
Peng Xu: Wave Phenomena and Intellectual Inversion Imaging Research Group (WPI), School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
Huazhong Wang: Wave Phenomena and Intellectual Inversion Imaging Research Group (WPI), School of Ocean and Earth Science, Tongji University, Shanghai 200092, China

Energies, 2021, vol. 14, issue 14, 1-12

Abstract: The estimation of the subsurface acoustic impedance (AI) model is an important step of seismic data processing for oil and gas exploration. The full waveform inversion (FWI) is a powerful way to invert the subsurface parameters with surface acquired seismic data. Nevertheless, the strong nonlinear relationship between the seismic data and the subsurface model will cause nonconvergence and unstable problems in practice. To divide the nonlinear inversion into some more linear steps, a 2D AI inversion imaging method is proposed to estimate the broadband AI model based on a broadband reflectivity. Firstly, a novel scheme based on Gaussian beam migration (GBM) is proposed to produce the point spread function (PSF) and conventional image of the subsurface. Then, the broadband reflectivity can be obtained by implementing deconvolution on the image with respect to the calculated PSF. Assuming that the low-wavenumber part of the AI model can be deduced by the background velocity, we implemented the AI inversion imaging scheme by merging the obtained broadband reflectivity as the high-wavenumber part of the AI model and produced a broadband AI result. The developed broadband migration based on GBM as the computational hotspot of the proposed 2D AI inversion imaging includes only two GBM and one Gaussian beam demigraton (Born modeling) processes. Hence, the developed broadband GBM is more efficient than the broadband imaging using the least-squares migrations (LSMs) that require multiple iterations (every iteration includes one Born modeling and one migration process) to minimize the objective function of data residuals. Numerical examples of both synthetic data and field data have demonstrated the validity and application potential of the proposed method.

Keywords: broadband imaging; Gaussian beam migration; point spread functions; impedance estimation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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