A Novel Application of Time Reversed Acoustics: Salt Dome Flank Imaging Using Walkaway VSP surveys
Name
Willis_TRAreprint06.pdf
Size
320.84 KB
Format
Adobe PDF
Checksum (MD5)
8d385707acf48189fd64eeb46e1b7076
Author(s)
deHoop, Maarten V.
Willis, Mark E.
Lu, Rongrong
Campman, Xander
Toksoz, M. Nafi
Zhang, Yang
Date Issued
March 1, 2006
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;2006-13
Abstract
In this paper we present initial results of applying Time-Reversed Acoustics (TRA) technology to saltdome flank, seismic imaging. We created a set of synthetic 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 having to perform velocity analysis, moveout corrections, or complicated processing. Each redatummed trace approximates 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.
Description
GEOPHYSICS, VOL. 71, NO. 2 (MARCH-APRIL 2006); P. A7–A11, 4 FIGS.
10.1190/1.2187711
Subjects
VSP
Interferometry
Imaging
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