Basic Seismic ProcessingINPUTFILTERCMP GatherNMOSTACKMIGRATEDISPLAYSTATICSMUTE
More Seismic ProcessingINPUTBP FILTERCMP GatherNMOSTACKMIGRATEDISPLAYGEOMVEL ANALSTATICSDEMUXVIB CORRFK FILTERDECONDMO/MIGRATESAVEDECONFK FILTERMUTEGAIN RCVRCOHERENCYENHANCECOHERENCYENHANCETIMETODEPTHEDIT
Stack
MigrationactualSeismic section(unmigrated)Migration(move it back)sin() = tan (a), where = true dip, a = apparent dip
Migration: Syncline
Migration EffectsModels(perfectly migrated)Synthetic Seismic Sections(Unmigrated)
DiffractionPoint Reflector(Diffractor)Reflection Response(Diffraction)
Diffraction Model of Generic ReflectionMultiple diffractors Dx = finiteMultiple diffractors Dx 0
Migration with Velocity DistortionLayer 1Layer 2Layer 3ALL
Depth Migration & Stack SmearingZero-0ffset(Single fold)10 Fold Stack
Migration Ex: SynclineBeforeAfter Migration?
Migration Ex: FaultBefore MigrationAfter Migration
Migration ExampleBefore MigrationAfter Migration
Migration: MethodologyDiffraction Summation(Diffraction Stack)Wavefront Summation(Kirchoff Stack)unmigratedmigrated
Migration MethodologyExploding Reflector(Back Propagation, Wave EquationFinite Difference, FK)
Migration Artifacts: Aperture35 traces70 traces150 traces256 traces
Migration Artifacts: VelocityTrue VV 5% lowV 10% lowV 20% low
Migration and NoiseRandom NoiseRandom Noise+MigrationMigration smilesesp at edges of dataUnmigratedMigrated
Migration: VoilaNote: Steep dip migration
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