Constraining the reservoir model of an injected CO₂ plume with crosswell CASSM at the Frio-II brine pilot

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• 作者：Thomas M. Daley ; ^a ; ^{tmdaley@lbl.gov"" rel=""nofollow} ; Jonathan B. Ajo-Franklin^a ; Christine Doughty^a
• 关键词：CO₂ ; Seismic ; Crosswell ; Reservoir model ; Petrophysics
• 刊名：International Journal of Greenhouse Gas Control
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：5
• 期：4
• 页码：1022-1030
• 全文大小：2447 K

文摘

Crosswell CASSM (continuous active-source seismic monitoring) data was acquired as part of the Frio-II brine pilot CO₂ injection experiment. To gain insight into the CO₂ plume evolution, we have integrated the 3D multiphase flow modeling code TOUGH2 with seismic simulation codes via a petrophysical model that predicts seismic velocity for a given CO₂ saturation. Results of forward seismic modeling based on the CO₂ saturation distribution produced by an initial TOUGH2 model compare poorly with the CASSM data, indicating that the initial flow model did not capture the actual CO₂ plume dynamics. Updates to the TOUGH2 model required to better match the CASSM field data indicate vertical flow near the injection well, with increased horizontal plume growth occurring at the top of the reservoir sand. The CASSM continuous delay time data are ideal for constraining the modeled spatiotemporal evolution of the CO₂ plume and allow improvement in reservoir model and estimation of CO₂ plume properties.