Digital core reconstruction research: challenges and prospects

Abstract

In this review we have briefly reviewed the state of the art of “digital core” technology. In particular, we reviewed the main artefacts that can occur in the analysis of rocks by computed X-ray microtomography. Next, we highlighted the existing approaches of direct mathematical modelling of core filtration characteristics using digital model and poroset models. Literature analysis has shown that the most justified in the ratio of required technical resources (computer power) and reliability of results is the integrated approach. Unfortunately, when calculating phase permeabilities using digital core models, it is necessary to calibrate simulation results using standard laboratory methods. We also analysed some approaches to modelling enhanced oil recovery methods such as hydrochloric acid and hydraulic fracturing, as well as thermal stimulation of oil matrix rocks. In conclusion, we noted that the main challenge of today’s “digital core” technology is reliable calculation of phase permeabilities, and further development of the technology should be towards 4D modelling of EOR methods using digital core models.