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1 Acta Geophysica

1 2021

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One-way wave propagation in the ray-centred coordinate system for vertical transversely isotropic media

Zhang Bohan, Wang Huazhong

Acta Geophysica

2021

Vol. 69, no. 4

1225--1239

Seismic wave imaging in complex media requires a suitable wave feld simulation method that can accurately describe realmedia wave propagation. Reverse time migration is currently the preferred method; however, it is not optimal for simulating wave feld propagation as it is based in solving the wave equation (qP-wave equation). The objective of this study is to develop a wave propagation simulation method to accurately describe the P-wave energy, which is less afected by complex surface conditions, and easily integrate anisotropy and attenuation by absorption media. Herein, qP-wave propagation is simulated in vertical transversely isotropic (VTI) media using the one-way wave equation in the ray-centred coordinate system (15°), which combines the fexibility of ray theory and accuracy of wave theory to describe wave propagation. Based on the qP-wave equation of VTI media, the wave equation in the ray-centred coordinate system and the one-way wave equation (15°) in the ray-centred coordinate system are derived. The 15° one-way wave equation can simulate the wave propagation process in complex media. Numerical experiments verify that the simulation results for the 15° equation in the ray-centred coordinate system exhibit high accuracy.