A screening assessment of the impact of sedimentological heterogeneity on CO2 migration and stratigraphic-baffling potential: Johansen and Cook formations, Northern Lights project, offshore Norway

We use a method combining experimental design, sketch-based reservoir modelling, and single-phase flow diagnostics to rapidly screen the impact of sedimentological heterogeneities that constitute baffles barriers CO2 migration in Johansen Cook formations at Northern Lights storage site. The types spatial organisation wave-dominated deltaic sandstones Johansen-Cook unit are constrained using core data from 31/5-7 (Eos) well, previous interpretations seismic regional well-log correlations, outcrop subsurface analogues. Delta planform geometry, clinoform dip, facies-association interfingering extent along clinoforms control: (1) distribution connectivity high-permeability medial proximal delta-front sandstones, (2) effective horizontal vertical permeability characteristics unit, (3) pore volumes injected breakthrough time (which approximates efficiency stratigraphic baffling). In addition, lateral continuity carbonate-cemented concretionary layers transgressive surfaces impacts permeability, bioturbation intensity permeability. combined effects these other also influential. Our results suggest baffling effect on retention heterogeneity is an important precursor for later capillary, dissolution mineral trapping.