{P}hysics and seismic modeling for monitoring {CO}2 storage

  • Carcione J
  • Picotti S
  • Gei D
 et al. 
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We present a new petro-elastical and numerical-simulation methodology
to compute synthetic seismograms for reservoirs subject to CO2 sequestration.
The petro-elastical equations model the seismic properties of reservoir
rocks saturated with CO2, methane, oil and brine. The gas properties
are obtained from the van der Waals equation and we take into account
the absorption of gas by oil and brine, as a function of the in situ
pore pressure and temperature. The dry-rock bulk and shear moduli
can be obtained either by calibration from real data or by using
rock-physics models based on the Hertz-Mindlin and Hashin-Shtrikman
theories. Mesoscopic attenuation due to fluids effects is quantified
by using White's model of patchy saturation, and the wet-rock velocities
are calculated with Gassmann equations by using an effective fluid
modulus to describe the velocities predicted by White's model. The
simulations are performed with a poro-viscoelastic modeling code
based on Biot's theory, where viscoelasticity is described by generalizing
the solid/fluid coupling modulus to a relaxation function. Using
the pseudo-spectral method, which allows general material variability,
a complete and accurate characterization of the reservoir can be
obtained. A simulation, that considers the Utsira sand of the North
Sea, illustrates the methodology.

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  • J M Carcione

  • S Picotti

  • D Gei

  • G Rossi

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