 | RESIDUAL MOVEOUT CORRECTION |
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Since we calculate and apply migration velocity and Thompson's parameters there is still some under-corrections on far offsets that we need to flatten. g-Platform system contains special module for that task called RMO by picking (manual or auto). Create a new workflow 0450_RMO:
Add all necessary modules to the workflow:
1. Read seismic traces - seismic data - load traces after migration 2. Sort traces - sort traces by CMP 3. Read seismic traces - velocity - load migration velocity 4. Create velocity model - convert seismic gather velocity into a velocity model format 5. Seismic loop - process every sorted gather in a loop (one by one) 6. RMO by picking - pick and apply residual move out corrections 7. Save seismic by gather - save seismic gathers
1) Read seismic traces - seismic data. Load seismic data set after migration 0400_APSTM. Parameters:
2) Sort traces. sorting by CDP - OFFSET: Parameters:
Execute those modules. 3) Read seismic traces - velocity. Load gather migration velocity. Parameters:
4) Create velocity model. Convert gather migration velocity into velocity model format. Parameters:
5) Seismic loop. Put two modules inside: Radon multiple attenuation and Save seismic by gather. 6) RMO by picking. This module transforms seismic calculates velocity correction and corrects velocity model using residual moveout correction. Define input data items and parameter: Input data:
Switch off auto picker mode, because we are going to use manual picking of RMO. Parameters:
Open all vista groups. Perform manual RMO picking on Velocity Analysis window and check on Output CIG gather. Input window does have time arrival curves. We need to pick CIG points with increment (i.e. 500 meters):
Execute the module for refreshing output vista window and check result.
6) Save seismic by gather. Define an output file name 0450_RMO and execute the entire seismic loop: Parameters:
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