Residual CO2 Saturation Distributions in Rock Samples Measured by X-ray CT

H. Okabe1 — Y. Tsuchiya1 — C. H. Pentland2 — S. Iglauer2 — M. J. Blunt2

1Japan Oil, Gas and Metals National Corporation1-2-2 Hamada, Mihama-ku, Chiba, 261-0025, Japanokabe-hiroshi@jogmec.go.jptsuchiya-yoshihiro@jogmec.go.jp

 

2 Department of Earth Science and Engineering, Imperial College LondonPrince Consort Road, SW7 2BP, United Kingdomc.pentland07@imperial.ac.uks.iglauer@imperial.ac.ukm.blunt@imperial.ac.uk

ABSTRACT. Understanding multiphase flow and trapping mechanisms in porous rocks at the laboratory-scale is required to design carbon dioxide (CO2) geological sequestration at the field-scale. Coreflood laboratory experiments on sandstones and carbonate rocks using supercritical CO2 and brine were conducted with in-situ saturation monitoring by X-ray Computed Tomography (CT). The residual CO2 saturation obtained by capillary trapping is evaluated experimentally. Supercritical CO2 is injected into a brine saturated core followed by injection of CO2-saturated brine. This prevents the dissolution of carbon dioxide into the brine and the amount of CO2 residual trapping in the rock can be measured. The experimental results show the trapped CO2 saturation ranging from 0.2 to 0.4 for the rocks with permeability ranging from 6 to 220 md. The proposed method with in-situ saturation monitoring reveals piston-like displacement inside homogeneous sandstone, while heterogeneous flow behaviour is observed on a ...

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