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• W3144585446 abstract "Risk assessment of [Formula: see text] storage requires the use of geophysical monitoring techniques to quantify changes in selected reservoir properties such as [Formula: see text] saturation, pore pressure, and porosity. Conformance monitoring and the associated decision making rest upon the quantified properties derived from geophysical data, with uncertainty assessment. We have developed a general framework combining seismic and controlled-source electromagnetic (CSEM) inversions with rock-physics inversion with fully Bayesian formulations for proper quantification of uncertainty. The Bayesian rock-physics inversion rests upon two stages. First, a search stage consists of exploring the model space and deriving models with the associated probability density function (PDF). Second, an appraisal or importance sampling stage is used as a “correction” step to ensure that the full model space is explored and that the estimated posterior PDF can be used to derive quantities such as marginal probability densities. Both steps are based on the neighborhood algorithm. The approach does not require any linearization of the rock-physics model or assumption about the model parameters’ distribution. After describing the [Formula: see text] storage context, the available data at the Sleipner field before and after [Formula: see text] injection (baseline and monitor), and the rock-physics models, we perform an extended sensitivity study. We find that prior information is crucial, especially in the monitor case. We determine that joint inversion of seismic and CSEM data is also key to properly quantifying [Formula: see text] saturations. Finally, we apply the full inversion strategy to real data from Sleipner. We obtain rock frame moduli, porosity, saturation, and patchiness exponent distributions and the associated uncertainties along a 1D profile before and after injection. The results are consistent with geology knowledge and reservoir simulations, i.e., that the [Formula: see text] saturations are larger under the caprock confirming the [Formula: see text] upward migration by buoyancy effect. The estimates of the patchiness exponent have a larger uncertainty, suggesting semipatchy mixing behavior." @default.
• W3144585446 created "2021-04-13" @default.
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• W3144585446 date "2021-06-30" @default.
• W3144585446 modified "2023-10-18" @default.
• W3144585446 title "Bayesian rock-physics inversion: Application to CO₂ storage monitoring" @default.
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• W3144585446 doi "https://doi.org/10.1190/geo2020-0218.1" @default.
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