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- W2093863178 abstract "For successful prestack depth migration an accurate velocity model is needed. One method for model updating is based on image gather analysis. In an image gather all reflectors line up horizontally if the correct velocities are used for the depth migration. This is also true for dipping reflectors, as all traces of an image gather belong to the same surface coordinate. The images of the reflector in an image gather curve upwards if the velocity used for the migration is too low, or downwards if the velocity is too high. This deviation can be used for model updating. Curves which depend on depth, offset and a parameter which relates the estimated to the true model are fitted to the image. By calculating the coherence along the deviation curves, this parameter can be estimated and hence an update can be calculated" @default.
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- W2093863178 date "1994-11-01" @default.
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- W2093863178 title "Velocity model updating using image gathers1" @default.
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- W2093863178 doi "https://doi.org/10.1111/j.1365-2478.1994.tb00250.x" @default.
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