Estimation of CO2 storage capacity coefficients in geologic formations

Abstract

Abstract This work investigates effective CO2 storage capacity of a field case example, the Ketzin reservoir (CO2SINK) in Germany with highly heterogeneous permeability and porosity. The present concept of storage capacity coefficients is briefy explained and then extended to widen the usability in the long term. A basecase incorporating the latest geological model is defined, for which storage capacity coefficients are given in the course of time. The effective storage capacity C for a injection of 60000 tons of CO2 is 5.7 per mill in terms of pore volume. A sensitivity study on the Net-to-Gross ratio shows, that the applicability of the final effective storage capacity coefficient is limited here. All realisations show about the same effective storage capacity C . However, the location of the CO2 mass and the mobility (mobile/immobile gas) varies with the N / G ratio. For increasing N / G ratio, more mobile CO2 mass stays in the sand channels.