An imaging condition for acoustic reverse time migration with implicit angle-dependent weighting factors and its extended applications for imaging elastic P-P and S-S data

Han, Bingkai1; Mao, Weijian1; Ouyang, Wei1; Zhang, Qingchen1; Lei, Tao2

2024-07-01

10.1111/1365-2478.13566

GEOPHYSICAL PROSPECTING   影响因子和分区

0016-8025

1365-2478

The imaging condition is a crucial component of the reverse time migration. In its conventional form, it involves cross-correlating the extrapolated source- and receiver-side wavefields. Effective imaging conditions are usually developed to suppress imaging artefacts (e.g. low-wavenumber artefacts) and enhance the image quality. For acoustic reverse time migration, not only the scalar pressure but also their spatial and/or time derivatives are used in the imaging condition, similar to the gradient terms of adjoint tomography. These operations implicitly introduce additional angle-domain weighting factors to the image results. In this study, based on an analysis of angle-dependent properties of the existing imaging conditions, we propose a new imaging condition tailored for acoustic reverse time migration. It can be implemented efficiently using the variables within the finite-difference solver. Without explicitly measuring wave propagation directions, the proposed imaging condition can naturally suppress the low-wavenumber artefacts while maintaining a relatively wider imaging aperture, thereby corresponding to a broader wavenumber sampling range. Additionally, the evolved imaging conditions for imaging elastic P-P and S-S scattering and reflections are also formulated. In the angle domain, we conduct a comparative analysis between existing imaging conditions and the newly proposed ones. Various numerical examples are provided to demonstrate the advantages of the new imaging conditions. A comprehensive understanding of their angle-domain properties may be further beneficial to constructing reasonable inversion strategies for full waveform inversion.

full waveform imaging numerical study seismics

SCI

英语

其他

National Natural Science Foundation of China["42130808","42274174"] ; China Postdoctoral Science Foundation[2023M743582]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001260098700001

WILEY

GEOSCIENCES

Web of Science

1.Chinese Acad Sci, Res Ctr Computat & Explorat Geophys, State Key Lab Geodesy & Earths Dynam, Innovat Acad Precis Measurement Sci & Technol, Wuhan 430077, Peoples R China
2.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

Han, Bingkai,Mao, Weijian,Ouyang, Wei,et al. An imaging condition for acoustic reverse time migration with implicit angle-dependent weighting factors and its extended applications for imaging elastic P-P and S-S data[J]. GEOPHYSICAL PROSPECTING,2024.

Han, Bingkai,Mao, Weijian,Ouyang, Wei,Zhang, Qingchen,&Lei, Tao.(2024).An imaging condition for acoustic reverse time migration with implicit angle-dependent weighting factors and its extended applications for imaging elastic P-P and S-S data.GEOPHYSICAL PROSPECTING.

Han, Bingkai,et al."An imaging condition for acoustic reverse time migration with implicit angle-dependent weighting factors and its extended applications for imaging elastic P-P and S-S data".GEOPHYSICAL PROSPECTING (2024).