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Type: Artigo de periódico
Title: Physical modeling of anisotropic domains: Ultrasonic imaging of laser-etched fractures in glass
Author: Stewart, RR
Dyaur, N
Omoboya, B
de Figueiredo, JJS
Willis, M
Sil, S
Abstract: Many regions of subsurface interest are, or will be, fractured. Seismically characterizing these zones is a complicated but essential task for resource development. Physical modeling, using ultrasonic sources and receivers over scaled exploration targets, can play a useful role as an analog for reservoir imaging and assessment. We explored the anisotropic response of glass blocks containing internal fractures created by a novel laser-etching technique. We compared transmitted and reflected signals for P- and S-waves from fractured and unfractured zones in a suite of ultrasonic (1-5 MHz) experiments. The unaltered glass velocities have averages of 5804 and 3447 m/s for P-and S-waves, respectively (giving V-P/V-S = 1.68). The unfractured glass has a very high quality (Q) factor of over 500 for P-waves and S-waves. The fractured zones have a small (up to 1.5%) velocity decrease. Signals propagating through the fractured zone have diminished amplitudes and increased coda signatures. Reflection surveys (zero-offset and with variable polarizations) record significant scatter from the fractured zones. The fracture-scattered energy can be migrated to provide a sharper image. The glass specimens with laser-etched fractures display a rich anisotropic response, which can help inform field-scale imaging.
Country: EUA
Editor: Soc Exploration Geophysicists
Rights: aberto
Identifier DOI: 10.1190/GEO2012-0075.1
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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