DEVICE AND METHOD OF ADAPTIVE ANGULAR EXTRAPOLATION FOR REVERSE TIME MIGRATION THREE DIMENSIONAL ANGLE GATHERS

摘要

Computer instructions, computing device and method for processing seismicdata under-sampled in an angle domain, the seismic data corresponding to areversetime migration, three-dimensional, angle domain common image gather (ADCIG).The method includes receiving the seismic data; calculating, based on theseismicdata, shot and receiver wave-fields with an RTM wave propagation engine;applyinga wave-fields decomposition algorithm to obtain a propagation direction forthe shotand receiver wave-fields; forming the ADCIG by applying an image condition totheshot and receiver wave-fields; determining that specular energies of the ADCIGareunder-sampled around a reflection angle; during the step of forming the ADCIG,extrapolating the specular energies to a neighborhood of the reflection angle;andgenerating an image of a subsurface that is being surveyed based on theextrapolated specular energies.