Postdoctor WEI Wei and his teacher FU Liyun develop a method for the efficient computation of multifrequency focal beams for 3D seismic acquisition geometry analysis.

They propose a rapid 3D multifrequency focal beam method in which only a few single-frequency focal beam computations are followed by a number of smart interpolations. The 3D wavefield extrapolation in the focal beam analysis is conducted by the combined applications of a 3D degenerate Fourier migrator and a 3D Born-Kirchhoff interpolation operator, a process that reduces the computational cost for complex media. The multifrequency focal beam analysis is applied to a 3D model from an oil field of China, demonstrating how spatial sampling differences affect seismic imaging.

Figure 1. The efficient algorithm for multifrequency focal beams, an inverse Fourier transform is applied to convert all the frequency components into time domain.(Image by WEI)

Figure 2. Schematic diagram of the DF-BK propagator.(Image by WEI)

Wei et al. Fast multifrequency focal beam analysis for 3D seismic acquisition geometry.  Geophysics. 2012, 77(2): 11-21 (Download Here)