Transcript
Page 1: Seismic Modeling, Migration and Velocity Inversion

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

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Tomography Residual Tomography

Flat Gathers After

Flat gathers.Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 11 / 19

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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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