Modelling of long-term along-fault flow of CO2 from a natural reservoir

As part of the European ACT-sponsored research consortium, DETECT, we developed an integrated characterisation and risk assessment toolkit for natural fault/fracture pathways. In this paper, describe DETECT experimental-modelling workflow, which aims to be predictive fault-related leakage quantification, its application a field case example validation. The workflow combines laboratory experiments obtain single-fracture stress-dependent permeabilities; modelling relative permeabilities capillary pressures; fracture network caprock(s); upscaling properties constitutive functions in networks; full compositional flow at scale. Here focus on Green River site Utah. This is rare from shallow CO2 reservoir, where (dissolved or gaseous) migrates along two fault zones surface. provides unique opportunity understand mechanisms volumes faults, because extensive including large dataset present-day surface flux measurements as well historical records form travertine mounds. When applied site, our methodology predicts locations accurately and, within order magnitude, rates correctly without history matching. Subsequent matching achieves accurate leak rate matches a-priori uncertainty ranges model input parameters.