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Dating CO 2 leakage rates from a natural analogue for CO 2 storage Zoe Shipton (GU), Neil Burnside (GU/SUERC), Rob Ellam (SUERC), Ben Dockrill (Chevron)

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Presentation on theme: "Dating CO 2 leakage rates from a natural analogue for CO 2 storage Zoe Shipton (GU), Neil Burnside (GU/SUERC), Rob Ellam (SUERC), Ben Dockrill (Chevron)"— Presentation transcript:

1 Dating CO 2 leakage rates from a natural analogue for CO 2 storage Zoe Shipton (GU), Neil Burnside (GU/SUERC), Rob Ellam (SUERC), Ben Dockrill (Chevron) CO 2 Capture Project Statoil, Norsk Hydro, Shell, BP, Eni, EnCana Suncor, ChevronTexaco, Norway, EU, US DOE

2 Geological setting Shipton et al. 2005

3 Present Leakage Oil seep

4 Past Leakage Dockrill 2006, Dockrill and Shipton 2008

5 LGWF MF SWFs Dockrill and Shipton 2008, Vrolijk et al. 2006

6 Individual mounds active for up to ~10ka Evidence of reactivation of these pathways with 3 distinct mounds ranging in age of ~45ka Flow pathways switch repeatedly through time

7 Leak points spread along the faults as pathways become completely sealed Flow not continuous - periods of inactivity indicate intermittent flow regime to the surface

8 Volumetric estimates min. LGW travertine volume 1.5 x 10 5 m 3 = 4.3 x 10 8 kg CO 2 if 10% of CO 2 trapped in travertine ~ 1.9 x 10 9 kg CO 2 leaked over ~ k yrs Time- averaged flux > 0.84 kg/m 2 /yr = 0.6μmol/m 2 /s forest floor 2 to 20μmol/m 2 /s (Drewitt et al., 2002) Mammoth Mtn tree kill avg 400μmol/m 2 /s (Benson & Hepple 05) Gouveia et al. (2005) Crystal Geyser emits CO 2 ~ 12 ktonnes/year Recent increase due to drilling? Constraints on volume through time from new dates combined CO 2 storage capacity of fault-sealed traps ~ Mt Dependent on saturation state and density of CO2 Assuming leakage confined to above trap leak rate of over ~ 0.2% to 1.9% every 500 yrs

9 Natural CO 2 reservoirs in Utah = laboratory to study leakage of CO 2 natural springs boreholes elevated soil gas? Observed changes in flow pattern may be caused by: sealing of fault pathways by carbonate precipitation changes in stress on faults or regional hydrology ~ 30 to 300% of total trap capacity leaked over 110 kyrs What leak rate acceptable for industrial storage?


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