RT Journal Article
SR Electronic
T1 Quantification of variability in laminated sediments: a role for the probe permeameter in improved reservoir characterization
JF Geological Society, London, Special Publications
JO Geological Society, London, Special Publications
FD Geological Society of London
SP 433
OP 442
DO 10.1144/GSL.SP.1993.073.01.25
VO 73
IS 1
A1 Corbett, P. W. M.
A1 Jensen, J. L.
YR 1993
UL http://sp.lyellcollection.org/content/73/1/433.abstract
AB Fluvial and aeolian reservoirs are commonly laminated. Cross-bedding, for example, in these environments comprises foresets of contrasting grain size and sorting resulting from periodic fluctuations in depositional current strengths. These contrasts are commonly associated with variations in permeability. The recent development of a small-scale permeability measurement device (probe permeameter) allows quantification of these contrasts. Laminated sediments can now be described numerically in terms of permeability variability. Such measurements provide an appropriate quantity for comparison of lamination styles and are useful in reservoir characterisation.We illustrate the measurement of permeability variability with probe permeameter data from the Etive and Rannoch Formations (Middle Jurassic, lower Brent Group, North Sea). These intervals, albeit from a shallow marine setting, reveal a relationship between permeability and depositional facies that was not clear from traditional permeability measurements (core plugs). The permeability variability is related to grain size variations (Etive) and mica content (Rannoch) which are controlled by depositional processes. The coefficient of variation (a statistical measure) has been used to quantify the variability. Using this measure, we compare permeability variation in the laminated shoreface sandstones with recently published examples from aeolian and fluvial sandstones.