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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
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Journal of Petroleum Geology, Vol.
Part II. Reservoir potential of the Carboniferous
*School of Geosciences, The Queen's University of Belfast, Belfast BT7 1NN.
Abstract
Porosities
are generally
low (less than 5%) in the west, but sandstones there may be
comparable with those in tight gas reservoirs elsewhere.
Sandstones in the east exhibit very high
porosities
in boreholes.
Kaolinite is a late phase occupying pore space in the upper parts
of most successions, deposited by downward-migrating meteoric
fluids, possibly during Permian times. Late iron oxides in some
sandstones were similarly precipitated during deep weathering
below the sub-Permian unconformity. Sandstones exhibit very
patchy bitumen residues in the west, demonstrating that oil has
migrated through these
rocks
.
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