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