Common Focus Point (CFP) Migration And AVP Analysis Based On The Wave Theory

Common focus point migration technology is a kind of prestack seismic imaging method based on the principle of equal traveltime and it separates Kirchhoff integral into two focusing steps (focusing in emission and focusing in detection). If structural information is sought, confocal version of CFP migration is fulfilled by the zero traveltime imaging principle in time domain. And if lithological information is required, bifocal version of CFP migration is implemented by the zero intercept time imaging principle in Radon domain.In the thesis, we based on the wave extrapolation theory realize the confocal version of CFP migration and do the CFP-AVP analysis, during the confocal version of CFP migration, 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, and also we carry out the relative amplitude-preserved processing in the thesis, and get the nice result. 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 property analysis field, in the thesis we come true the two steps focus by using the wave continuation theory, we 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 sections of the focus points of the target field. Tests on model and real data show the validity and the practicability of this CFP-AVP analysis method...