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A novel application of time-reversed acoustics: Salt-dome flank imaging using walkaway VSP surveys

By
Mark E. Willis
Mark E. Willis
Massachussets Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts 02139. E-mail: mewillis@mit.edu; lurr@mit.edu; xander@erl.mit.edu; toksoz@mit.edu.
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Rongrong Lu
Rongrong Lu
Massachussets Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts 02139. E-mail: mewillis@mit.edu; lurr@mit.edu; xander@erl.mit.edu; toksoz@mit.edu.
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Xander Campman
Xander Campman
Massachussets Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts 02139. E-mail: mewillis@mit.edu; lurr@mit.edu; xander@erl.mit.edu; toksoz@mit.edu.
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M. Nafi Toksöz
M. Nafi Toksöz
Massachussets Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts 02139. E-mail: mewillis@mit.edu; lurr@mit.edu; xander@erl.mit.edu; toksoz@mit.edu.
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Yang Zhang
Yang Zhang
Massachussets Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts 02139. E-mail: mewillis@mit.edu; lurr@mit.edu; xander@erl.mit.edu; toksoz@mit.edu.
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Maarten V. de Hoop
Maarten V. de Hoop
Massachussets Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts 02139. E-mail: mewillis@mit.edu; lurr@mit.edu; xander@erl.mit.edu; toksoz@mit.edu.
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Published:
January 01, 2008

Abstract

In this paper we present initial results of applying Time-Reversed Acoustics (TRA) technology to salt- dome flank, seismic imaging. We created a set of syn’thetic traces representing a multilevel, walkaway VSP for a model composed of a simplified Gulf of Mexico vertical-velocity gradient and an embedded salt dome. We first applied the concepts of TRA to the synthetic traces to create a set of redatummed traces without hav’ing to perform velocity analysis, moveout corrections, or complicated processing. Each redatummed trace ap’proximates the output of a zero-offset, downhole source and receiver pair. To produce the final salt-dome flank image, we then applied conventional, poststack, depth migration to the zero-offset section. Our results show a very good image of the salt when compared to an image derived using data from a downhole, zero-offset source and receiver pairs. The simplicity of our TRA implementation provides a virtually automated method to estimate a zero-offset, seismic section as if it had been collected from the reference frame of the borehole containing the VSP survey.

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Contents

Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Interferometry: History and Present Status

Kees Wapenaar
Kees Wapenaar
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Deyan Draganov
Deyan Draganov
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Johan O.A. Robertsson
Johan O.A. Robertsson
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Society of Exploration Geophysicists
Volume
26
ISBN electronic:
9781560801924
Publication date:
January 01, 2008

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