This paper investigates the relations between small-scale sedimentary structures and permeability in the Brussels Sands formation, an early Middle-Eocene shallow marine sand deposit in Central Belgium. A field campaign is carried out consisting of field observations of the sedimentary structures and in situ measurements of air permeability. The sedimentary structures are sketched, photographed and measured. Additionaly, a total of 2750 cm-scale air permeability measurements are carried out in situ. Comparison between the sedimentary structures and permeability shows that clay-rich sedimentary features such as bottomsets and distinct mud drapes exhibit a different permeability distribution than the rest of the crossbedded sands. Another interesting result is that anisotropy in the cross-bedded sands is dominated by the foreset lamination orientation. The results thus show that the sedimentary heterogeneity results in a clear permeability heterogeneity.
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