Journal of Natural Gas Science and Engineering
Bottom simulation re fl ectors (BSR) are seismic events generally corresponding to a partially saturated layer with gas separating hydrate-bearing sediments from brine-saturated sediments. Seismic attenua- tion and velocity dispersion affects the waveform of the BSR event. In this work, we consi...
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| Format: | Article |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://www.lucabaradello.it/carcione/QCSH15.pdf http://eprints.utp.edu.my/12206/ |
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| Summary: | Bottom simulation re
fl
ectors (BSR) are seismic events generally corresponding to a partially saturated
layer with gas separating hydrate-bearing sediments from brine-saturated sediments. Seismic attenua-
tion and velocity dispersion affects the waveform of the BSR event. In this work, we consider a 1D
methodology to study the effects of seismic
Q
, velocity dispersion, layer thickness and properties and
characteristics of the overburden on the re
fl
ection coef
fi
cients and waveform of such event. We describe
the media by using a rock-physics model based on poroelasticity, calculate the re
fl
ection coef
fi
cient of
the BSR layer of varying thickness and compute the waveforms with a full-wave pseudospectral method.
The proposed rock-physics/modeling methodology is fast in terms of computer requirements and can be
used to quantify the seismic properties and compute waveforms useful for seismic interpretation and
inversion of quantities such as porosity, hydrate content, gas saturation, clay content and thickness of the
BSR layer. We show that in many cases the interpretation can be counterintuitive and a proper rock-
physics methodology is essential to reach valid conclusions about the in
fl
uence of the different pa-
rameters on the wave properties. |
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