Geosequestration of CO2 requires guided transport to and reliable quantification of the storage capacity of geologic formations as well as safety assessment to ensure permanent retention of the injected fluid. We present a workflow based on the analysis of well logs, experimental insights, and reservoir simulation to better map CO2 saturation distribution from time-lapse seismic data. CO2 saturation maps are typically derived from 4D seismic data using rock physics models to assess fluid saturation and pressure effects. We present here a combination of our rock physics understanding to guide reservoir flow simulations. We find that in addition to fluid saturation changes, fluid reactions with the injected CO2 might better explain 4D seismic amplitude change maps.

Keywords:
reservoir characterization, well logging, enhanced recovery, chemical flooding methods, modeling & simulation, log analysis, subsurface storage, seismic data, upstream oil & gas, saturation change
Subjects:
Reservoir Characterization, Reservoir Fluid Dynamics, Improved and Enhanced Recovery, Reservoir Simulation, Formation Evaluation & Management, Storage Reservoir Engineering, Seismic processing and interpretation, Four-dimensional and four-component seismic, Flow in porous media, Chemical flooding methods
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