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A MUltiple Space and Time scale approach for the quAntification of deep saliNe formations for CO2 storaGe

Work package 8 Scale effects

WP leader
CSIC
Participants
UU EWRE IIT

Objectives

The objectives of this WP are to identify the time and space scales that are relevant for understanding and modeling of CO2 spreading and for evaluation of performance and risk assessment:
  • For each identified level of time – space scale, outline the significant flow and transport processes that need to be taken in account;
  • For each process and time – space scale, define the upscaled formulation of the individual processes and of the comprehensive models that describe the injection and spreading in the brine saturated formation
Work progress (March 2011)

The main findings and results so far include:
  • Quantification of the increased CO2 front spreading due to the interaction of spatial heterogeneity and buoyancy in terms of effective dispersion coefficients.
  • Derivation of effective reaction kinetics for reactive transport in heterogeneous media and evaluation of the impact of heterogeneity on the reaction efficiency. Reaction rates in heterogeneous media are in general smaller than in homogeneous laboratory settings due to mass transfer limitations.
  • Identification of the local scale mass transfer and heterogeneity processes that control mixing and their quantification in terms of the scalar dissipation rate. This description allows for the separation between mixing and spreading processes, which are often equalized for transport in heterogeneous media.
  • Efficient simulation techniques for the modelling of non-Fickian large scale transport processes as described by the multirate mass transfer and continuous time random walk frameworks.

Figure 6. Concentration distribution evolving from a line source at t = 0 at x =0 after t = 26 advection times. One can clearly distinguish advective spreading and actual mixing (MUSTANG, 2011)

©Mustang - 2009