Capillary heterogeneity trapping of CO2 in a sandstone rock at reservoir conditions

Details Capillary heterogeneity trapping of CO2 in a sandstone rock at reservoir conditions Capillary heterogeneity trapping of CO2 in a sandstone rock at reservoir conditions

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3815401k&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 15, CiteID L15401

Physics

1

Hydrology: Groundwater Hydrology, Hydrology: Groundwater Transport, Hydrology: Rocks: Physical Properties

Scientific paper

The storage of CO2 in deep subsurface porous rocks is being developed worldwide for the mitigation of emission from large industrial sources such as power plants and steel manufacturing. A main concern of this technology is in ensuring that the upwardly buoyant CO2 does not migrate to the surface. Simulation studies suggest that substantial amounts of CO2 can be trapped within permeable sections of a reservoir by capillary forces and intra-reservoir heterogenities, but there is little experimental observation of these phenomena. We report the results of CO2 core flooding experiments at high pressure and temperature performed to investigate the impact of natural capillary heterogeneity in a sandstone rock on CO2 saturation buildup and trapping. CO2 and water were injected through a Mt. Simon sandstone core at 9 MPa pore pressure and 50°C. The core had two regions of distinct capillarity: An upstream 10 cm long region of the core consisted of a relatively high permeability and homogenous sand. A downstream 3 cm long region of the core consisted of a low permeability region characterized by significant cross-bedding and a high capillary entry pressure for CO2. During a drainage process of CO2 displacing water, CO2 builds up upstream of the capillary barrier. Once in place, CO2 on the upstream side of the barrier cannot be displaced during 100% water flooding leading to trapped saturations that are a factor 2-5 times higher than what would be expected from residual trapping alone.

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