SEGJ Technical Conference

Availability of Fresnel volume migration to seismic reflection method using incident angles decided by tau-P transform

Abstract Seismic reflection method is one of the powerful geophysical exploration methods. An elastic wave passes in a spatial volume depending on its wavelength, which is called Fresnel volume. For the better migration technique, we considered the Fresnel volume for every received elastic wave. Fresnel volume migration is particularly applicable for seismic data with restricted aperture due to survey conditions such as tunnel seismic survey, VSP, etc. To use Fresnel volume migration, we first have to choose Fresnel volume for each of given seismic trace. In this study, we calculated an incident angle for each receiver using tangential angles, one of which using amplitudes of acquired 3C component data and the other using tau-P transform. After comparison, we used the latter considering that both incident angle and medium wave slowness could be estimated in the acquisition. We found slant stack method showed better result for the data that second P-P reflected wave and first P-S reflected waves are overlapped.