摘要
本文从三维不均匀介质中的波动方程外推算子分解出发 ,得到了用于真振幅偏移的单程波方程 ;再经过一系列数学变换 ,推导出裂步傅里叶法真振幅偏移和傅里叶有限差分法真振幅偏移的波场外推方程。文中还给出了其具体的实现过程 ,并采用 Marm ousi模型的数值计算结果进行验证 ,表明此方法在总体上与相应的常规偏移结果相当 ,在某些局部处理效果有较大改善。
Starting from the decomposition of wave equ- ation extrapolation operator in 3-D non-uniform medium,the paper gained one-way wave-equation used for true amplitude migration;after a series of mathematical transformation,the paper deduced the wave fields extrapolation equations used for split-step Fourier true amplitude migration and Fourier finite-difference true amplitude migration.The paper also gave the concrete realizing process and used the numerical computed result of Marmousi model to verify the method,which showed that the method generally corresponds to common migration results but has great improvement in processed effects of some local parts.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2004年第3期283-286,共4页
Oil Geophysical Prospecting
关键词
波动方程
三维不均匀介质
振幅
地震波
反射面
偏移成像处理技术
wave equation,true amplitude migration operator,split-step Fourier migration,Fourier finite-difference migration,hybrid method
