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- W55755426 abstract "Amplitude preservation in Pre-Stack Depth Migration (PSDM) processes that use wave field extrapolationmust be ensured first, in the operators used to continue the wavefield in time or depth, and second,in the imaging condition used to estimate the reflectivity function. In the later point, the conventionalcorrelation-type imaging condition must be replaced by a deconvolution-type imaging condition. Migrationperformed in common-shot profile domain obtains the final migrated image as the superposition of imagesresulting of migrate each shot separately. The amplitude obtained in a point of the migrated image correspondsto the sum of the reflectivities for each shot which has illuminated such point, along the angles determinedby the velocity model and the positions of the source and the receiver. The deeper the reflector, the lowerthe amplitude of the illumination field will be. As result, the correlation-type imaging condition producesimages with an unbalanced amplitude decrease with depth. A deconvolution-type imaging condition scalesthe amplitudes through a correlation, using the weighting function dependent on the spectral density or theillumination of the downgoing wave field. In this article, two possible scaling functions have been used inthe case of a single shot. In the case of data with multiple shots, five scaling possibilities are presented withthe spectral density or the illumination function. The results of applying these imaging conditions to syntheticdata with multiple shots show that the values of the amplitude in the migrated images are influenced by thecoverage of the common midpoint, compensating this effect only in one of the imaging conditions described.Numerical experiments with synthetic data generated using Seismic Unix and the Sigsbee2a data are presented,highlighting that in velocity fields with strong vertical and lateral velocity variations, the balance ofthe amplitudes of the deep reflectors relative to the shallow reflectors is strongly influenced by the imagingcondition applied." @default.
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- W55755426 date "2012-01-01" @default.
- W55755426 modified "2023-09-23" @default.
- W55755426 title "Deconvolution type imaging condiction effects on short profile migration amplitudes" @default.
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