【摘要】 在时间空间域,模拟吸收衰减效应时对计算机内存需求大,计算效率不高、非常难以进行模拟吸收衰减;频率空间域通过引入品质因子和复值速度,使用经验物理、数学公式进行数值模拟吸收衰减就容易多了。笔者使用十分节省计算机内存需求的嵌套剖分法,使用Kjartansson模型高效率地进行模拟吸收衰减。数值试验证实吸收衰减影响地震场的所有频率、对高频的影响最为明显,降低了地震记录的质量;频率空间域非常容易模拟吸收衰减效应,为黏声波全波形反演实际地震资料而奠定很好的基础。更多还原

【Abstract】 Modeling absorption and attenuation in time-space domain requiring a lot of computer memory with low computational efficiency,it is hard to simulate attenuation in time-space domain.We can use an empirical physical or mathematical formulation to simulate absorption and attenuation in frequency-space domain through introducing complex velocity and Q values.We can easily describe attenuation with high efficiency in frequency-space domain using nested dissection and Kjartansson’s model.Numerical experiments demonstrate that absorption and attenuation affects all the frequency components of the wavefield and affects a greater impact on the higher frequency components,so it decreases the seismic record’s resolution.It is very easy to simulate absorption and attenuation effects in frequency-space domain,providing a good foundation for visco-acoustic wave full waveform inversion on real data.更多还原