For the SEG-EAGE salt data set, common-azimuth migration produces better images in the subsalt than single-arrival Kirchhoff migration, at a similar computational cost. Subsalt reflectors are better imaged and the typical Kirchhoff artifacts caused by severe multipathing disappear. We show how angle-domain Common Image Gathers (CIG) can be easily extracted from prestack wavefield downward conti...

Wave-equation migration with the velocity of the primaries maps non-diffracted waterbottom multiples to an hyperbola in subsurface-offset-domain-common-image-gathers. Furthermore, for positive surface offsets, the multiples are mapped to non-positive subsurface offsets if sediment velocity is faster than water. The larger the offset in the data space, the larger the subsurface offset and the sh...

These shortcomings can be overcome if we have some way to estimate residual statics before velocity analysis. F-X filtered common offset gathers are used by Chan (1996) as the model for residual statics analysis before velocity is available, because the common offset domain is the only dimension in seismic surface geometry which is theoretically independent to the velocity information. Chan (19...

Abstract Full-waveform inversion (FWI) of limited-offset marine seismic data is a challenging task due to the lack refracted energy and diving waves from shallow sediments, which are fundamentally required update long-wavelength background velocity model in tomographic fashion. When these events absent, reliable initial necessary ensure that observed simulated waveforms kinematically fit within...

Generalized prestack velocity analysis methods that use an automated approach to resolve laterally variable interval velocity fields are beset by a series of problems. The problem of resolving lateral velocity variations has inherent complications that prevent automated methods from being robust enough to be applied routinely to data from a variety of geologic provinces. The use of automated pr...

In this paper I compared imaging conditions of three different prestack migrations in terms of angle-dependent reflectivity recovery. The imaging conditions compared are shot profile migration with conventional imaging condition, de Brduin’s imaging condition, and planewave synthesis imaging. The conventional imaging condition can be applied to any reflector geometry and to arbitrary velocity, ...

CFP technology (Berkhout, 1996a,b) addresses these limitations in a novel way. By breaking the model determination process into two simpler, more easily solved problems, those of operator estimation and macro model estimation, the final solution will typically be more accurate. Moreover, by providing rapid local convergence to the correct travel-time operators, migration analysis can be automat...

A reconfigurable computing (RC) platform called SPACE (Seismic data Processing Accelerator with reConfigurable Engine) is proposed to accelerate the execution of 3D prestack Kirchhoff time migration (PSTM) based on the optimized 6 order NMO Correction technology (Sun et. al. 2002). Our simulations demonstrated up to 22 X performance improvement on the proposed RC platform comparing with the pur...