Abstract

An onshore shallow marine sandbody has been investigated in several extensive quarry outcrops in the Norfolk area of eastern England in terms of its sedimentology (sedimentary structures, geometry and architecture), sequence stratigraphy and reservoir-scale heterogeneity. In addition to conventional sedimentological logging techniques, vertical profiles were analysed using a steady-state electronic probe permeameter to investigate permeability heterogeneity. Permeability analysis was also complemented by spectral gamma ray profiles, which were used to characterize facies associations in terms of their total radioactivity and relative proportions of potassium, uranium and thorium. It was found that lithofacies type and bounding surface have the dominant control on permeability heterogeneity and thus flow unit compartmentalization. This study aims to complement pre-existing outcrop analogue datasets which attempt to model fluid flow more accurately in analogous subsurface reservoirs. It also serves to highlight the difficulty in accurately identifying and modelling subsurface shallow marine/estuarine tidal channel depositional systems for well/drainage and or production strategies.

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