摘要
弹性波波场分离数值模拟方法是研究混合波场中纯纵波和纯横波波场传播规律的一种重要手段,通常采用算子分裂来实现,这不但增加了计算量,而且还浪费了大量计算时间。因此提出了基于散度和旋度的弹性波波场分离数值模拟新方法,仅依赖于交错网格来计算出散度场(纯纵波)和旋度场(纯横波),从而提高计算效率。在人工截断边界处采用完全匹配层吸收边界条件(PML)。数值模拟结果表明,该方法能够从混合波场中准确地分离出纯纵横波波场,且精度高,边界吸收效果好,计算速度快,计算过程稳定,可用于指导实际多波多分量地震资料处理,同时指出本文算法对相互耦合的波型(如面波)无法实现准确分离。
Elastic wave field separation numerical modeling has been an important means to study the propagating rule of pure compress wave and pure shear wave of the hybrid elastic wave field. The general method is achieved by the operator separation, which not only increase the computed memory, but also waste a lot of computed time. Thus we put forward a new elastic wave field separation numerical modeling scheme base on divergence and curl, which is only depended on staggered grid to compute the divergence field （compress wave） and curl field （shear wave） , so the computed efficiency is greatly improved. Perfect Matched Layer （PML） absorbing boundary condition is used to weaken the reflection wave from the boundary. The numerical result shows that this method can correctly and quickly separate pure compress wave and pure shear wave from hybrid wave field with high precision, good boundary absorption, and the numerical process is stable, so it can be used to guide multi-wave multi-components seismic datum processing, and also point out that the method has difficulty to separate the coupled wave type such as surface wave.
出处
《物探与化探》
CAS
CSCD
北大核心
2010年第1期103-107,共5页
Geophysical and Geochemical Exploration
关键词
高阶交错网格
波场分离
弹性波动方程
散度和旋度
high-order staggered-grid
wave field separation
elastic wave equation
divergence and curl
