DEVELOPMENTS IN SYNCHROTRON X-RAY MICROTOMOGRAPHY WITH APPLICATIONS TO FLOW IN POROUS-MEDIA

High resolution computed microtomography (CMT) with synchrotron X-ray sources provides the ability to obtain three-dimensional (3D) images o f specimens with a spatial resolution on the order of micrometers. Mic roimaging capabilities at Brookhaven Natl. Laboratory's Natl. Synchrot ron Light Source have been enhanced to provide larger and higher resol ution 3D renderings of pore networks in reservoir rocks at a fraction of the time required in previous first generation scanning methods. Su ch data are used to model single and multiphase flow properties in dig ital images of real porous media. Pore networks are analyzed for tortu osity and connectivity measures, which have been elusive parameters in transport property models. We present examples of porosimetry simulat ion through network modeling to produce initial water saturation and r esidual oil distributions in a water-wet pore system. Furthermore, por e networks can provide the boundary condition framework for more rigor ous simulations of displacement, such as in the lattice Boltzmann simu lated waterflood example provided. Direct comparison between simulatio n and experiment is also possible. CMT images of a 6-mm subsection of a 1-in, diameter reservoir core sample were obtained before and after flooding to residual oil. The fluid distributions from CMT, lattice Bo ltzmann waterflood simulation, and percolation-based network modeling were found to be highly correlated. Advances in 3D visualization will allow even greater digestion and interpretation of phenomena dependent upon pore interconnectivity and multipore interactions.