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- W2035932449 abstract "The ultimate goal of time-lapse seismic monitoring is to measure changes in reservoir fluid contents or pressure during hydrocarbon production. However, successful 4-D imaging strongly depends on the properties of reservoir rocks and fluids. These properties are only available from well logs or core measurements which are sparsely distributed in space and contain significant uncertainties because of the heterogeneity of the earth. As a first step in quantifying the effect of such uncertainties on the analysis of seismic data, we examined stochastic models of several reservoir properties using numerical simulation of both fluid flow and seismic wave propagation. We first considered the influence of permeability by performing streamline simulations of fluid flow for 27 realizations of permeability models that were all derived from a single reference porosity model. The maximum change of seismic amplitude for these permeability models is 5 %. The maximum standard deviation of the amplitude change is 65 %. We also computed the time-lapse amplitude for 27 realizations of a dry bulk modulus model of the reservoir, one of the quantities required for fluid substitution using the Gassmann equation. The seismic modeling applied the average fluid saturation and pressure data from the results of the permeability models. The range of amplitude change was approximately the same as the obtained from the various permeability models. However, the maximum standard deviation of the amplitude changes from the 27 dry bulk modulus models is 27 %, which is smaller than that obtained from the permeability models. Therefore, the uncertainty in seismic modeling results is less for the dry bulk modulus than for permeability. This in turn suggests that differences in time-lapse seismic response for regions with rock properties similar to those in our models can be utilized to infer variations in permeability in the interwell space." @default.
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- W2035932449 date "2002-01-01" @default.
- W2035932449 modified "2023-09-24" @default.
- W2035932449 title "Uncertainty analysis in time‐lapse seismic modeling" @default.
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- W2035932449 doi "https://doi.org/10.1190/1.1817012" @default.
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