Geochemical Interaction between CO2 and Caprock for Safe Carbon Sequestration

Safe Carbon dioxide capture and storage (CCS) requires characterization of the geochemical interaction between CO2 and caprock at micro and nano scales. Ordovician Kingsport formation limestone rock samples were obtained at a depth of 250 m from Nyrstar Tennessee Mines. The characterization and monitoring of the geochemical and fracture behavior of the rock samples exposed to CO2 brine for a long duration were studied using 3D computed tomography (CT), and high speed coupled micro beam x ray fluorescence (μXRF) and micro beam x ray diffraction (μXRD).