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CO2SINK Project Overview: Ketzin, Germany

CO2SINK project in Ketzin, Germany, aims to monitor safe geosequestration through drilling 3 wells and injecting up to 60,000 tons of CO2. The project involves risk assessment, geological analysis, monitoring CO2 fate, and public confidence building.

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CO2SINK Project Overview: Ketzin, Germany

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  1. CO2SINK ProjectOverview Elizabeth Mackie & Andrew Garnett (EPT-RXX) (PTC consultancy) Presented by Michiel Groeneveld, Head EPT-RXX Shell International E&P

  2. The site • Location • West of Berlin • 5+km from Ketzin “city” • Site choice ? • It was available • It is brown field (quick, no EIA) • Legacy issues • Former storage site - status • Basic concept - reservoir-seal geology. • Reservoir uncertain • Seal “unproven” Figure 1. Location of the town, Ketzin, Germany. The Ketzin anticline, the site for the CO2SINK experiment, is located in the vicinity of the town.

  3. Site Structure • Unproven 4-way dip closure – i.e. no HC, few 100s m above a salt swell • Up to 40m of Triassic fluvial reservoirs; perm 10mD – 500mD; porosity 6-12% (nominal) 3D Stuttgart Formation Reservoir architecture CO2SINK drill site Ketzin

  4. CO2SINK – in brief WHAT ? • EU, onshore “storage” “project nr Berlin • Three shallow wells (<800m) • Up to 60,000 tonnes injected at +/- 1kg/s • Unproven 4-way dip closure. • Up to 40m of Triassic (mid-keuper) fluvial reservoirs (10mD – 500mD) • High salinity “0.2 [kg/kg]” • But … ~300m below abandoned, former DDR shallow gas storage site - numerous old wells. WHY ? • To contribute to public confidence that geosequestration is “safe”. • Specific aims • Intensive monitoring of CO2 fate. • Benchmarking of numerical models. • Development of risk assessment schema

  5. Plan • Drilling - 3 shallow wells (<800m) - 2 observation & 1 inject • Injection - ‘up to’ 60 000 tons +/- 1kg/s - high salinity brine “0.2 [kg/kg]” - Food grade, pure CO2, hydrogen plant • Geology - 40m Triassic (mid-keuper) fluvial sandstone - Beneath a 200m thick Triassic mudstone “seal”. - 1.5 km down-flank of the crest of the anticline

  6. West – East Across Roscow -> Ketzin Double “dome” salt swell Int. aquifer CO2 Geology – cross section

  7. Two Functionalities • Locate & quantify: where CO2is the (brine) Geosphere • Assure: that CO2is not in sensitive domains DOMAINS Atmosphere Other gas emission sampling Rd, He ?? Airborne CO2 Sampling ? “Sniffer” Sampling CO2 “Sniffer” Sampling CH4 Sensitive domains Biosphere Soil CO2 gas Grid Sampling Soil CH4 gas Grid Sampling Hydrosphere (fresh) Hydrogeological Models Water wells sampling Obs Wells Geosphere (brine) Core Analysis Fluids & Logging X-Well methods M/VSP “STAR” 3-4D Seismic Geomech Models Well/Bore Models CO2 spec. Models e.g. MUFTE Full Geosphere Eclipse Model- faults& wells ? FluvSim Static Model Basinal Flow Models Reactive Flow Models e.g. TOUGHREACT Cap-rock analyses Modelling, Surveying & Sampling initial pressure

  8. Flow modelling • Containment Risk Assessment (DNV) • Project management, PR & HSE advice • Well technical integrity • Ad hoc technical advice • Geomechanical • Capillarity top seal analysis • Seismic Shell expertise

  9. Permanent downhole monitoring • Distributed Temperature Sensors (DTS) • Vertical Electrical Resistivity Array (VERA) • Overall reservoir pressure (fibre-optic) Electrical Tomography

  10. Conclusions • CO2SINK injection early 2007 • Shell should get involved more pilot projects –the more we know the better!

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