Reservoir condition imaging of reactive transport in heterogeneous carbonates using fast synchrotron tomography - effect of initial pore structure and flow conditions

摘要: Abstract We investigate the impact of initial pore structure and velocity field heterogeneity on dynamics fluid/solid reaction at high Peclet numbers (fast flow) low Damkohler number (relatively slow rates). The Diamond Lightsource Pink Beam was used to image dissolution Estaillades Portland limestones in presence CO 2 -saturated brine reservoir conditions (10 MPa 50 °C representing ~ 1 km aquifer depth) two flow rates for a period 2 h. Each sample scanned between 51 94 times 4.76-μm resolution dynamic changes porosity, permeability, rate were examined using analysis modelling. find that porosity can either increase uniformly through time along length samples, or may exhibit spatially temporally varying is attributed channel formation, process distinct from wormholing, depending conditions. regime structure-dependent: with higher showed more uniform dissolution, while lower experienced formation. effective up orders magnitude than those measured flat substrate no transport limitations, indicating reactant product severely hampered away fast channels.