Sandstone was filled with oil, then water was injected, then CO2 was injected, then brine. Images were acquired with an Xradia VersaXRM. Samples were cylindrical, 5mm diameter, 10 mm length. Voxel resolution = 3.4 um. 80 kV is the energy used in the tomograph, 10 MPa is the pore pressure, 15 MPa is the confining pressure, at 25 C temperature.