Post on 27-Dec-2021
Seismic Modeling, Migration and VelocityInversionTomography
Bee Bednar
Panorama Technologies, Inc.14811 St Marys Lane, Suite 150
Houston TX 77079
May 18, 2014
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Outline
1 TomographyResidual Tomography
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Tomography
Outline
1 TomographyResidual Tomography
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Tomography Residual Tomography
Tomography after Migration
Residual tomographyGenerally applied after iterative shot-spread analysis has run its courseBased on
Local ”best” image dipOffset differences from gathers
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Tomography Residual Tomography
Residual Tomography
Tomographic geometry.
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Tomography Residual Tomography
Residual Tomography
Tomographic geometry.
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Tomography Residual Tomography
Tomographic Input Requirements
Residual depths as input to tomography.
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Tomography Residual Tomography
Constraining Tomography
Natural Tomographic Constraints
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Tomography Residual Tomography
Residual Tomography
Tomographic back projection.
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Tomography Residual Tomography
Non-Flat Gathers Before
Non flat gathers.Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 10 / 19
Tomography Residual Tomography
Flat Gathers After
Flat gathers.Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 11 / 19
Tomography Residual Tomography
Tomographic Updating
Horizon Based Tomography
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Tomography Residual Tomography
Tomographic Example from Alaska
Alaska land data image without tomography
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Tomography Residual Tomography
Tomographic Example from Alaska
Alaska land data image with tomography
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Tomography Residual Tomography
Tomographic Example from Wyoming
Wyoming land data image without tomography
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Tomography Residual Tomography
Tomographic Example from Wyoming
Wyoming land data image with tomography
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Tomography Residual Tomography
Tomographic Example from the Gulf of Mexico
Gulf of Mexico tomographic example. After Marta Jo Woodward. CourtesyWesternGeco
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Tomography Residual Tomography
Tomographic Input Requirements
Required input to residual tomographyA good migration velocity fieldA current set of horizons orLocal dip everywhereAs many horizons as possible.Picked set of residual depths for each common offset or angle gather
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Tomography Residual Tomography
Questions?
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