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- W1981775988 abstract "A tomographic inversion adjusts seismic reflection amplitudes to remove distortions caused by spatial variations in the transmission properties of the overlying earth. These variations create distinctive patterns on displays of reflection amplitude versus source-receiver offsets and midpoints. These patterns are inverted for amplitude corrections that remove the transmission distortions. The methodology is demonstrated on a strong “bright spot” reflection under a large filled channel in the Gulf of Mexico. Transmission anomalies are defined at each point in a depth model as a fractional increase or decrease in wave amplitude. These changes in amplitude scale multiplicatively along raypaths. An inversion of transmission anomalies (i) minimizes errors between modeled and picked amplitudes, (ii) uses a quadratic objective function for easy optimization, and (iii) distinguishes reflectivity changes from transmission anomalies. Reflection are estimated by reflection tomography for interval velocities. The effects of channel irregularities greatly obscured the observed amplitude versus offset in the Gulf of Mexico The transmission anomaly model reconstructed recorded amplitudes accurately and removed the corresponding interference patterns. Most transmission anomalies were imaged near the top of the channel. Local focusing and defocusing of waves by velocity variations can explain these perturbations of amplitudes. An anomaly does have different effects on reflections at different depths." @default.
- W1981775988 created "2016-06-24" @default.
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- W1981775988 date "1994-01-01" @default.
- W1981775988 modified "2023-09-24" @default.
- W1981775988 title "Tomographic correction of transmission distortions in reflected seismic amplitudes" @default.
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- W1981775988 doi "https://doi.org/10.1190/1.1932055" @default.
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