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Global Geology 2019, 22(2) 112-120 DOI:
10.3969/j.issn.1673-9736.2019.02.06 ISSN: 1673-9736 CN: 22-1371/P |
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3D numerical simulation in acoustic-elastic coupled media with staggered-grid finite-difference method |
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PENG Changhua, WANG Deli, ZHOU Jinju |
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College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China |
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Acoustic-elastic coupled media is often encountered in most marine explorations, and accurate simulation of acoustic-elastic coupled media is of great significance. At present, the study of acoustic-elastic coupled media still assumes that the solid of the acoustic-elastic coupled media is isotropic, but this assumption is not in accordance with the actual situation. In this paper, we derive the solid media of acoustic-elastic coupled media from isotropic media to anisotropic media, and propose an acoustic-elastic coupled medium based ontransverse isotropic media with vertical symmetric axes (VTI) to improve the accuracy of forward modeling. Based on the relationship between the Thomsen parameter and the coefficient matrix of the anisotropic elastic wave equation, we transform the Thomson parameter into a velocity model with anisotropic properties. We use a staggered grid finite difference method to simulate the propagation of a wavefield in a three-dimensional acoustic-elastic coupled media. We obtain the snapshots of the wave field when the solid of the acoustic-elastic coupled media is an isotropic medium and a VTI media. When the solid of the acoustic-elastic coupled media is considered VTI media, we can observe the qP wave and qS wave that cannot be observed in the isotropic medium from the wave field snapshot. We can also find that the seismic records obtained by the method we use are more realistic. The algorithm proposed in this paper is of great significance for high-precision ocean numerical simulation. |
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finite difference method
staggered grid
forward modeling
3D acoustic-elastic coupled media
transversely isotropic medium
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3D numerical simulation in acoustic-elastic coupled media with staggered-grid finite-difference method |
|
|
PENG Changhua, WANG Deli, ZHOU Jinju |
|
|
College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China |
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|
Abstract:
Acoustic-elastic coupled media is often encountered in most marine explorations, and accurate simulation of acoustic-elastic coupled media is of great significance. At present, the study of acoustic-elastic coupled media still assumes that the solid of the acoustic-elastic coupled media is isotropic, but this assumption is not in accordance with the actual situation. In this paper, we derive the solid media of acoustic-elastic coupled media from isotropic media to anisotropic media, and propose an acoustic-elastic coupled medium based ontransverse isotropic media with vertical symmetric axes (VTI) to improve the accuracy of forward modeling. Based on the relationship between the Thomsen parameter and the coefficient matrix of the anisotropic elastic wave equation, we transform the Thomson parameter into a velocity model with anisotropic properties. We use a staggered grid finite difference method to simulate the propagation of a wavefield in a three-dimensional acoustic-elastic coupled media. We obtain the snapshots of the wave field when the solid of the acoustic-elastic coupled media is an isotropic medium and a VTI media. When the solid of the acoustic-elastic coupled media is considered VTI media, we can observe the qP wave and qS wave that cannot be observed in the isotropic medium from the wave field snapshot. We can also find that the seismic records obtained by the method we use are more realistic. The algorithm proposed in this paper is of great significance for high-precision ocean numerical simulation. |
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Keywords:
finite difference method
staggered grid
forward modeling
3D acoustic-elastic coupled media
transversely isotropic medium
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�ո����� 2018-08-12 ������ 2018-10-25 ����淢������ |
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DOI: 10.3969/j.issn.1673-9736.2019.02.06 |
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Supported by Major Project of National Science and Technology of China (No.2016ZX05026-002-003) and National Natural Science Foundation of China (No.41374108). |
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