Abstract
Heavy oils have high densities and extremely high viscosities. Due to their viscoelastic behavior, traditional rock physics based on Gassmann theory becomes inapplicable. In order to determine P-wave velocity in heavy-oil sandstone after fluid substitution, P-wave velocities of three sandstone samples and one shale sample from the heavy-oil field are firstly measured under various temperature and oil saturation conditions. Based on these data a practical rock physics model is proposed. This rock physics model is then used to calculate the P-wave velocity after fluid substitution in the reservoir. The calculated velocity is then utilized in the generation of a synthetic seismogram. The match to the observed seismic data is greatly improved over the synthetic calculated from the sonic log measured before oil production.
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