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Wave Attenuation and Dispersion in Patchy Saturated Gas Reservoirs: Influence of Frequency and Saturation on AVO Attributes
Partially saturated rocks are considered to be major sources of seismic wave velocity dispersion and attenuation in recorded real data. From the physical description of partially saturated gas-water reservoirs, we use upscaling theories to compute an equivalent frequency-dependent porous medium. These homogenization methods are associated with mesoscale description of attenuation and dispersion coming from wave-induced flow phenomena. To compute wave propagation, we use numerical codes in the frequency domain that allow us to take into account all the frequency-dependent parameters. In this way, the Biot slow compressional wave, is well modeled and its partially diffusive, partially propagative behavior is completely considered. The waves attenuation and dispersion in such media is coming partly from the wave mode conversion into diffusive slow waves, not visible on seismograms. But the amplitude of propagative P- and S-waves are mainly affected by these energy losses at interfaces. So, thanks to a full waveform modeling, we investigate the AVO attributes with respect to saturation and frequency. For a simple three layer case, we compute poroelastic wave propagation, extract maximum amplitude with respect to angle and through a least-square fitting method, we obtain the AVO attributes for PP and PS reflected events. Due to the influence of mesoscale induced fluid flow phenomena and relatively to the regime of the Biot slow wave, the main results show a strong variability of the AVO attributes with the frequency and a lower variability with the saturation for reflected PP or PS events. Then, we conclude that these AVO attributes carry information about the saturation (through the reflection coefficients) and can be utilized in a poroelastic inversion process.
Wave Attenuation and Dispersion in Patchy Saturated Gas Reservoirs: Influence of Frequency and Saturation on AVO Attributes
Partially saturated rocks are considered to be major sources of seismic wave velocity dispersion and attenuation in recorded real data. From the physical description of partially saturated gas-water reservoirs, we use upscaling theories to compute an equivalent frequency-dependent porous medium. These homogenization methods are associated with mesoscale description of attenuation and dispersion coming from wave-induced flow phenomena. To compute wave propagation, we use numerical codes in the frequency domain that allow us to take into account all the frequency-dependent parameters. In this way, the Biot slow compressional wave, is well modeled and its partially diffusive, partially propagative behavior is completely considered. The waves attenuation and dispersion in such media is coming partly from the wave mode conversion into diffusive slow waves, not visible on seismograms. But the amplitude of propagative P- and S-waves are mainly affected by these energy losses at interfaces. So, thanks to a full waveform modeling, we investigate the AVO attributes with respect to saturation and frequency. For a simple three layer case, we compute poroelastic wave propagation, extract maximum amplitude with respect to angle and through a least-square fitting method, we obtain the AVO attributes for PP and PS reflected events. Due to the influence of mesoscale induced fluid flow phenomena and relatively to the regime of the Biot slow wave, the main results show a strong variability of the AVO attributes with the frequency and a lower variability with the saturation for reflected PP or PS events. Then, we conclude that these AVO attributes carry information about the saturation (through the reflection coefficients) and can be utilized in a poroelastic inversion process.
Wave Attenuation and Dispersion in Patchy Saturated Gas Reservoirs: Influence of Frequency and Saturation on AVO Attributes
Dupuy, Bastien (Autor:in) / Stovas, Alexey (Autor:in)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 51-60
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Seismic Signatures of Patchy Saturation
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