Z-Tomo Tomography
Obtaining high quality images of subsurface structures requires an accurate velocity model. Migration Velocity Analysis (MVA) improves the velocity model associated with a survey in order to create an accurate image of subsurface structures. After seismic data has been migrated through its current interval velocity model, the consistency of the model with the data is assessed by examination of the moveout in the common image gathers (CIGs), representing variation over different wave paths in the predicted depth of subsurface reflection events. Z-Tomo produces high quality velocity models while dramatically reducing the time required for each iteration of tomography. It also supports a wide range of velocity model building options and workflows:
- Vertical and normal ray updates
- Deregowski loop updates
- Wide azimuth tomography using
- offset gathers produced by Kirchhoff or Fast Beam Migration (FBM)
- angle gathers produced by wave-equation migration
- angle gathers produced by Kirchhoff migration or FBM
- Residual move-out gather-flattening and gather-fitting techniques
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