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research article

Full-wavefield modeling and reverse time migration of laser ultrasound data: A feasibility study

Shragge, Jeffrey
•
Blum, Thomas E.  
•
Van Wijk, Kasper
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2015
Geophysics

Laser ultrasound (LU) data acquired on cylindrical core samples effectively probe the physical properties of geologic materials. Although most LU analyses focus on estimating and inverting traveltimes of direct arrivals, it is important to recognize that LU data sets can have rich wavefield coda and can now be acquired with a sufficient spatial density to enable the application of exploration seismic full-wavefield techniques such as reverse time migration (RTM) and, potentially, full-waveform inversion (FWI). We have developed a feasibility study that examines the applicability of 2D acoustic forward modeling and 2D RTManalyses on laboratory LU data acquired on cylindrical polymer samples. Forward-modeled waveforms from our numerical tests matched the kinematics of the LU body waves measured through homogeneous samples, as well as the scattered wavefield generated by fractures induced in an otherwisehomogeneous medium. The scattered wavefield is then used in an RTM scheme to directly image millimeter-scale fracture structure. © 2015 Society of Exploration Geophysicists.

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Type
research article
DOI
10.1190/geo2015-0020.1
Author(s)
Shragge, Jeffrey
Blum, Thomas E.  
Van Wijk, Kasper
Adam, Ludmila
Date Issued

2015

Published in
Geophysics
Volume

80

Issue

6

Start page

D553

End page

D563

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
GEL  
Available on Infoscience
December 10, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/121597
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