High-resolution velocity inversion of migrated data after structural interpretation , by Jos van Trier

After determining a structural-velocity model, accurate velocity analysis might still be necessary in possible target zones for oil exploitation, or in areas where the velocity model is inconsistent with available geophysical or geological information. Reflections events in the constant surface location (CSL) gathers after migration are studied for this analysis. Variations in the depth of these events are inverted to find any local velocity perturbations, and the amplitude-versus-angle behavior of the events is used to verify velocity contrasts in the structural model.


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