title: Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography.
abstract: Underground storage permanence is a major concern for carbon capture and storage. Pumping CO2 into carbonate reservoirs has the potential to dissolve geologic seals and allow CO2 to escape. However, the dissolution processes at reservoir conditions are poorly understood. Thus, time-resolved experiments are needed to observe and predict the nature and rate of dissolution at the pore scale. Synchrotron fast tomography is a method of taking high-resolution time-resolved images of complex pore structures much more quickly than traditional µ-CT. The Diamond Lightsource Pink Beam was used to dynamically image dissolution of limestone in the presence of CO2-saturated brine at reservoir conditions. 100 scans were taken at a 6.1 µm resolution over a period of 2 hours. The images were segmented and the porosity and permeability were measured using image analysis and network extraction. Porosity increased uniformly along the length of the sample; however, the rate of increase of both porosity and permeability slowed at later times.
authors.affiliation: Department of Earth Science and Engineering, Imperial College London; h.menke12@imperial.ac.uk.
authors.forename: Hannah P
authors.initials: HP
authors.lastname: Menke
authors.affiliation: Carl Zeiss X-Ray Microscopy.
authors.forename: Matthew G
authors.initials: MG
authors.lastname: Andrew
authors.affiliation: Diamond Manchester Imaging Branchline (I13-2), Diamond Lightsource.
authors.forename: Joan
authors.initials: J
authors.lastname: Vila-Comamala
authors.affiliation: Diamond Manchester Imaging Branchline (I13-2), Diamond Lightsource.
authors.forename: Christoph
authors.initials: C
authors.lastname: Rau
authors.affiliation: Department of Earth Science and Engineering, Imperial College London.
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Blunt
authors.affiliation: Department of Earth Science and Engineering, Imperial College London.
authors.forename: Branko
authors.initials: B
authors.lastname: Bijeljic
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry*; D002245:Carbon Dioxide / Q000032:analysis*; D002254:Carbonates / Q000032:analysis*; D016062:Porosity; D017356:Synchrotrons; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D002254:Carbonates; D002245:Carbon Dioxide; D002119:Calcium Carbonate