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- W2895889232 abstract "Summary The accuracy of migration velocity estimation is critical for seismic imaging. Historically, ray-theory based approaches to migration-velocity estimation have been widely used in the industry. However, these approaches may be quite time consuming for a variety of reasons, e.g., event picking, extensive computation of ray-tracing results, total iteration turn-around time, etc. We present an efficient approach to estimation of a velocity model for time migration. As input, we use reflection slopes belonging to a pre-stack time-migrated seismic data set, which has been migrated using a preliminary (initial) velocity model. The slopes are derived using the gradient structure tensor method. We apply a fast migration velocity estimation loop, which combines kinematic de-migration, kinematic migration and linearized inversion for the parameters of the migration velocity model. The iteration scheme is based on minimizing the offset slope in the time-migration domain. The approach can be generalized for use in the depth domain, if supplemented by appropriate time-to-depth mapping techniques." @default.
- W2895889232 created "2018-10-26" @default.
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- W2895889232 date "2018-06-11" @default.
- W2895889232 modified "2023-09-23" @default.
- W2895889232 title "Time-migration Tomography based on Reflection Slopes in Pre-stack Time-migrated Seismic Data" @default.
- W2895889232 doi "https://doi.org/10.3997/2214-4609.201801383" @default.
- W2895889232 hasPublicationYear "2018" @default.
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