摘要
交错网格高阶差分解法是地震波场模拟的一种有效方法。较大的时间延拓步长可以提高效率,但可能引起算法不稳定,使模拟无法进行。因此,对于空间网格大小和时间步长的选择要适中。虽然震源子波的主频对模拟精度的影响不大,但适当提高震源子波的主频,可以提高地震波对于薄层的分辨率。FCT方法能够有效地压制数值频散,将FCT方法与交错网格有限差分法相结合,可以提高波场模拟的精度和运算效率。
The staggered-grid high-order differential method is an effective method in simulating seismic wave propagation.In this thesis,we find that a long time elapse will improve the efficiency of calculating,but may cause instability of the algorithm and make simulating fail.So the grid of space and the step of time should be selected appropriately.Although the dominant frequency of the seismic wavelet doesn't have much impact on the accuracy of simulating,enhancing it properly can improve the resolution for thin bed.Moreover the method flux-corrected transport(FCT) can suppress numerical dispersion effectively.Combining the method of FCT with staggered-grid properly can improve the accuracy of the wave field simulation and processing effectiveness.
出处
《物探化探计算技术》
CAS
CSCD
2009年第4期369-373,共5页
Computing Techniques For Geophysical and Geochemical Exploration
关键词
波场模拟
交错网格
频散分析
FCT
wave field simulation
staggered grid
dispersion analysis
FCT
