摘要
应用双相介质波动方程,推导了双相横向各向同性介质(TI)中波动方程的有限差分格式,对双相TI介质中弹性波有限差分数值进行了模拟。结果表明,弹性波在双相TI介质中传播时,除了存在常规的快纵波(qP1)和横波以外,还存在慢纵波(qP2)。并且慢纵波的速度明显小于快纵波,而且受耗散系数的影响衰减地很快,所以在实际中很难观测到慢纵波。快纵波在固相和流相中相位相同,而慢纵波在固相和流相中的相位相反。慢纵波在流相中振幅大,而在固相中的振幅较小。
Finite differential format of wave equation in two-phase transverse isotropic media(TI) is obtained by solving two-phase media wave equation,and the numerical simulation of elastic wave finite difference is carried out in two-phase TI media.The results show that in the two-phase elastic wave propagation in TI media,in addition to existing conventional fast P wave(qP1) and S wave,there is slow P wave(qP2),slow P wave was significantly less than the speed of fast P wave,and the dissipation coefficient attenuate very quickly,so in practice it is difficult to observe slow P wave.The phase of the fast P wave is same in both solid phase and liquid phase,and that of the slow P wave is reverse.the amplitude of the slow P wave in liquid phase is bigger than that in solid phase.
出处
《物探化探计算技术》
CAS
CSCD
2012年第5期533-540,500,共8页
Computing Techniques For Geophysical and Geochemical Exploration
基金
滨州学院科研基金(BZXYL1107)
关键词
双相横向各向同性介质
交错网格
有限差分法
弹性波
two-phase transversely isotropic media
staggered-grid
finite difference method
elastic wave
