Common Focus Point AVP Attribute Extraction Based On Bifocal Version Of CFP Technology

Common focus point migration technology is a kind of prestack seismic imaging method based on the principle of equal travel time and it separates Kirchhoff integral into two focusing steps. During the common focusing point migration, we can realize the confocal version of CFP migration by the principle of zero traveltime in the time-space domain,and realize the bifocal version of CFP migration by the principle of zero intercept time in the radon domain,and then respectively achieve the structure imaging and lithologic imging. To extract the AVP attribute, It order us use bifocal version of CFP migration is implemented by the zero intercept time imaging principle in Radon domain.During the confocal version of CFP migration process. we create the common focus point gather based on the wavefield continuation theory, and realize the CFP migration applying the Fourier finite difference method which is based on the wave equation. Combining the CFP migration based on the radial theory, we use the differential time shift analysis, symmetry property of phase errors to realize the updating of the velocity model. Using the CFP technology to do the Amplitude Versus P analysis is a big breakthrough in the seismic attribute analysis field, make use of the filter processing to the second focus step, and improve the quality of the reflectivity function, and at last using the bifocal version of CFP migration we get the AVP attribute of the focus points of the target. Tests on model and real data show the validity and the practicability of this CFP-AVP analysis method.