Seismic Modeling, Migration and Velocity Inversion Tomography Bee - - PowerPoint PPT Presentation

Seismic Modeling, Migration and Velocity Inversion

Tomography Bee Bednar

Panorama Technologies, Inc. 14811 St Marys Lane, Suite 150 Houston TX 77079

May 18, 2014

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 1 / 19

Outline

1

Tomography Residual Tomography

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 2 / 19

Tomography

Outline

1

Tomography Residual Tomography

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 3 / 19

Tomography Residual Tomography

Tomography after Migration

Residual tomography

Generally applied after iterative shot-spread analysis has run its course Based on

Local ”best” image dip Offset differences from gathers

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 4 / 19

Tomography Residual Tomography

Residual Tomography

Tomographic geometry.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 5 / 19

Tomography Residual Tomography

Residual Tomography

Tomographic geometry.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 6 / 19

Tomography Residual Tomography

Tomographic Input Requirements

Residual depths as input to tomography.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 7 / 19

Tomography Residual Tomography

Constraining Tomography

Natural Tomographic Constraints

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 8 / 19

Tomography Residual Tomography

Residual Tomography

Tomographic back projection.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 9 / 19

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

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 12 / 19

Tomography Residual Tomography

Tomographic Example from Alaska

Alaska land data image without tomography

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 13 / 19

Tomography Residual Tomography

Tomographic Example from Alaska

Alaska land data image with tomography

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 14 / 19

Tomography Residual Tomography

Tomographic Example from Wyoming

Wyoming land data image without tomography

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 15 / 19

Tomography Residual Tomography

Tomographic Example from Wyoming

Wyoming land data image with tomography

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 16 / 19

Tomography Residual Tomography

Tomographic Example from the Gulf of Mexico

Gulf of Mexico tomographic example. After Marta Jo Woodward. Courtesy WesternGeco

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration and Velocity Inversion May 18, 2014 17 / 19

Tomography Residual Tomography

Tomographic Input Requirements

Required input to residual tomography

A good migration velocity field A current set of horizons or Local dip everywhere As many horizons as possible. Picked set of residual depths for each common offset or angle gather

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

Tomography Residual Tomography

Questions?

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