摘要
通过引入记忆变量,可以避免粘弹性应力-应变关系中的褶积运算,使波场数值模拟易于实现.通过伪谱法对粘弹各向异性介质中的qP波、qS波数值模拟,结合理论分析,研究了粘弹各向异性介质中速度各向异性和衰减各向异性.衰减各向异性要比速度各向异性更为显著,并且qS波比qP波的衰减各向异性明显.粘弹各向异性介质中,粘弹性对波的影响主要在于波的衰减,各向异性主要影响波前面形状.
By introducing memory variables, superposition operation can be avoided, so wave fields modeling can be easily processed. And by means of pseudospeetrum method modeling qP and qS waves in viscoelastic anisotropie meida, with theory analysis, the velocity anisotropy and attenuation anisotropy are investigated. Attenuation anisotropy is more obvious than velocity anisotropy, and the attenuation anisotropy of qS waves is more significant than that of qP waves. In viscoelastic anisotropic media, the effects of viscoelasticity is mainly on wave attenuation and anisotropy on wave fronts.
出处
《地球物理学进展》
CSCD
北大核心
2007年第3期804-810,共7页
Progress in Geophysics
基金
国家自然科学基金(40574042)
国家油气专项项目(XQ-2004-07-05)资助
关键词
粘弹各向异性
伪谱法
波场数值模拟
衰减各向异性
viscoelastic anisotropy, pseudospectrum method, numerical modeling of wave fields, attenuation anisotropy
