Seismic Modeling, Migration, and Velocity Inversion Blessing Texas - - PowerPoint PPT Presentation

Seismic Modeling, Migration, and Velocity Inversion

Blessing Texas 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 / 28

Outline

1

Blessing Texas Synopsis 3D Data Velocity Model Migrations and Gathers Migration Depth Slices Coherence Cubes Summary

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 2 / 28

Blessing Texas

Outline

1

Blessing Texas Synopsis 3D Data Velocity Model Migrations and Gathers Migration Depth Slices Coherence Cubes Summary

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 3 / 28

Blessing Texas Synopsis

Blessing Texas Approximate Location Map

Blessing Texas 3D survey location is SW of Houston and NE of Palacios Texas.

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Blessing Texas Synopsis

Synopsis

Objective is fault terminated trap in the Frio Tertiary geological environment Trap found on 2D seismic

Early 1990’s

3D obtained to improve recovery Provide best image of fault structures

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Blessing Texas 3D Data

Blessing Texas Fold Diagram

Blessing Texas 3D fold coverage.

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Blessing Texas 3D Data

Blessing Texas Shot Location Map

Blessing Texas 3D shot coverage.

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Blessing Texas 3D Data

Blessing Texas Receiver Location Map

Blessing Texas 3D receiver coverage.

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Blessing Texas 3D Data

Blessing Texas Typical Shot

Blessing Texas eight channel shot.

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Blessing Texas 3D Data

Blessing Texas Prepossessing

Preprocessing

First break mute Band pass filter 6-40 Hz Two-second automatic gain control Three-dimensional spreading correction

Recovers spreading energy decay

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Blessing Texas Velocity Model

Blessing Texas 3D Velocity Field

Final Blessing Velocity Model. Standard no-horizon 4 iteration MVA.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 11 / 28

Blessing Texas Velocity Model

Blessing Texas 3D Velocity Field

Final Blessing Velocity Model showing impact of major fault.

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Blessing Texas Migrations and Gathers

Blessing Texas Kirchhoff PSTM

CDP 1410 at LIN 1410 together with PSTM of Crossline 1410. Gather on left show strong amplitude at top of Frio. Note lack of strong dipping events to the right of the base fault. Remember, the input were automatically gained so lack

• f AVO is not surprising..

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 13 / 28

Blessing Texas Migrations and Gathers

Blessing Texas Kirchhoff PSDM

CDP 1410 at Line 1410 together with Kirchhoff PSDM of Crossline 1410. Smeared look of CDP gather is a display artifact caused by a large offset

• spacing. Note that this depth migration has preserved relative amplitude

strength.

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Blessing Texas Migrations and Gathers

Blessing Texas Beam PSDM

CDP 1410 at Crossline 1410 together with Beam Stack Kirchhoff PSDM of Crossline 1410. Smeared look of CDP gather is a display artifact caused by a large offset increment. Dipping events appeared to be somewhat suppressed.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 15 / 28

Blessing Texas Migrations and Gathers

Blessing Texas Kirchhoff Migration

Kirchhoff 3D depth migration showing LINE 1410. Strong amplitude event is the pay zone.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 16 / 28

Blessing Texas Migrations and Gathers

Blessing Texas Beam Migration

Beam-Stack 3D depth migration showing LINE 1410. Strong amplitude event is the pay zone.

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 17 / 28

Blessing Texas Migrations and Gathers

Blessing Texas RTM Migration

RTM 3D depth migration showing LINE 1410. Strong amplitude event is the pay zone. Note improved resolution of this migration.

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Blessing Texas Migration Depth Slices

Blessing Texas Kirchhoff Migration

Kirchhoff migration and depth slice

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Blessing Texas Migration Depth Slices

Blessing Texas RTM Migration

Full two-way reverse-time migration and depth slice

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Blessing Texas Migration Depth Slices

Blessing Texas Kirchhoff Migration

Kirchhoff Depth Slice

Bee Bednar (Panorama Technologies) Seismic Modeling, Migration, and Velocity Inversion May 18, 2014 21 / 28

Blessing Texas Migration Depth Slices

Blessing Texas RTM Migration

Full two-way-reverse-time Depth Slice

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Blessing Texas Coherence Cubes

Blessing Texas Kirchhoff Coherence

Kirchhoff coherence depth slice

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Blessing Texas Coherence Cubes

Blessing Texas RTM Coherence

Full two-way-reverse-time coherence depth slice

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Blessing Texas Coherence Cubes

Blessing Texas Kirchhoff Coherence

Kirchhoff coherence depth slice

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Blessing Texas Coherence Cubes

Blessing Texas RTM Coherence

Full two-way-reverse-time coherence depth slice

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Blessing Texas Summary

Summary and Conclusions

Best fault resolution

Somewhat dependent on scaling Depends on objective RTM has highest fault resolution RTM seems to provide best resolution overall

Multiples remain in final images

Peg legs and not free surface Difficult to remove with destroying primaries

Velocity analysis straightforward Little evidence of anisotropy

Interpretation done on depth-to-time sections

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Blessing Texas Summary

Questions?

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