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| NUMERICAL MODELING AND ATTENUATION CHARACTERISTICS OF SEISMIC WAVEFIELD IN KELVIN-VOIGT VISCOELASTIC MEDIA |
| YAN Hong-yong1,2, LIU Yang1,2 |
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
2. CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum, Beijing 102249, China |
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Abstract This paper uses finite difference algorithm of high-order staggered-grid simulate Kelvin-Voigt viscoelastic media of seismic waves and meanwhile introduces the perfectly matched layer(PML) absorbing boundary condition into its boundary. Numerical simulation demonstrates that the effect of this algorithm of absorbing boundary is very good and the wavefield of viscoelastic media obtained from high-order finite difference is relatively accurate. An analysis of viscoelastic wavefield simulation shows that the energy of the reflected wave becomes weaker, the attenuation of the high frequency wave is much more apparent in comparison with that of the low frequency wave, the main frequency becomes closer to the low frequency, and the effective bandwidth is narrower, which all induce low resolution of seismic wave according to the simulation of viscoelastic wavefields. Besides, the attenuation of PS-wave is much more rapid in comparison with that of PP-wave and the peak frequency becomes lower gradually with the increase of the propagating distance. It is also shown that the absorption and attenuation are more apparent with the increase of viscosity coefficient by analysis of the absorption and attenuation of seismic wave in different viscosity coefficient media.
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Received: 18 February 2011
Published: 10 October 2012
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