Skip to Main Content
Book Chapter

Virtual shear source makes shear waves with air guns

By
Andrey Bakulin
Andrey Bakulin
Shell International Exploration & Production Inc., Houston, Texas 77025. E-mail: andrey.bakulin@shell.com; albena.mateeva@shell.com; rodney. calvert@shell.com; patsy.jorgensen@shell.com; jorgej.l.lopez@shell.com.
Search for other works by this author on:
Albena Mateeva
Albena Mateeva
Shell International Exploration & Production Inc., Houston, Texas 77025. E-mail: andrey.bakulin@shell.com; albena.mateeva@shell.com; rodney. calvert@shell.com; patsy.jorgensen@shell.com; jorgej.l.lopez@shell.com.
Search for other works by this author on:
Rodney Calvert
Rodney Calvert
Shell International Exploration & Production Inc., Houston, Texas 77025. E-mail: andrey.bakulin@shell.com; albena.mateeva@shell.com; rodney. calvert@shell.com; patsy.jorgensen@shell.com; jorgej.l.lopez@shell.com.
Search for other works by this author on:
Patsy Jorgensen
Patsy Jorgensen
Shell International Exploration & Production Inc., Houston, Texas 77025. E-mail: andrey.bakulin@shell.com; albena.mateeva@shell.com; rodney. calvert@shell.com; patsy.jorgensen@shell.com; jorgej.l.lopez@shell.com.
Search for other works by this author on:
Jorge Lopez
Jorge Lopez
Shell International Exploration & Production Inc., Houston, Texas 77025. E-mail: andrey.bakulin@shell.com; albena.mateeva@shell.com; rodney. calvert@shell.com; patsy.jorgensen@shell.com; jorgej.l.lopez@shell.com.
Search for other works by this author on:
Published:
January 01, 2008

Abstract

We demonstrate a novel application of the virtual source method to create shear-wave sources at the location of buried geophones. These virtual downhole sources excite shear waves with a different radiation pattern than known sources. They can be useful in various shear-wave applications. Here we focus on the virtual shear check shot to generate accurate shear-velocity profiles in offshore environments using typical acquisition for marine walkaway vertical seismic profiling (VSP). The virtual source method is applied to walkaway VSP data to obtain new traces resembling seismograms acquired with downhole seismic sources at geophone locations, thus bypassing any overburden complexity. The virtual sources can be synthesized to radiate predominantly shear waves by collecting converted-wave energy scattered throughout the overburden. We illustrate the concept in a synthetic layered model and demonstrate the method by estimating accurate P- and S-wave velocity profiles below salt using a walkaway VSP from the deepwater Gulf of Mexico.

You do not currently have access to this article.

Figures & Tables

Contents

Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Interferometry: History and Present Status

Kees Wapenaar
Kees Wapenaar
Search for other works by this author on:
Deyan Draganov
Deyan Draganov
Search for other works by this author on:
Johan O.A. Robertsson
Johan O.A. Robertsson
Search for other works by this author on:
Society of Exploration Geophysicists
Volume
26
ISBN electronic:
9781560801924
Publication date:
January 01, 2008

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal