DEPOSITS AND SOIL CLASSIFICATION: THE PREDICTION OF CHANNEL SAND DISTRIBUTION
WITHIN THE TRIASSIC ARGILO-GRESEUX INFERIEUR (TAG-I), BERKINE BASIN, ALGERIA.
Sabaou*1, D.E. Lawton2, P. Turner3 and D.
1 Badley Ashton & Associates Ltd., Winceby House, Winceby, Horncastle,
Lincolnshire, LN9 6PB.
2 BHP Billiton Petroleum (International Exploration)
Pty. Ltd., Neathouse Place, Victoria,
London, SW1V 1LH.
3 School of Geography, Earth and Environmental Sciences, The University of
4 PM Geos Limited, 3rd Floor, 24 Market Street, Aberdeen,
author for correspondence, email: email@example.com
Middle to Late Triassic fluvio-lacustrine
sandstones referred to as the Trias Argilo-Grèseaux Inférieur (TAG-I)
are an important hydrocarbon reservoir in the Algerian Berkine Basin.
Three depositional sequences have been identified within the TAG-I and a fourth
sequence overlies it, forming part of the “Trias Argilo-Carbonaté”. Subtle changes in the style of sedimentation
through these sequences have been identified and are attributed to periodic
rises in base-level together with changes in subsidence rate and climate, leading
to basinward, progradational shifts of the fluvial
systems. The palaeoclimate changed from semi-arid
to sub-humid with seasonal wetting and drying, as indicated by the evolved style
of the deposition, the abundance of vegetation and the nature of associated
palaeosols. The presence of sphaerosiderites in green
palaeosols is a clear indication of the occurrence of wetland conditions. Palaeosol
development and maturity are useful aids to stratigraphic correlation and as
an indication of the proximity of reservoir channel sandstones. With improved
prediction of the sandbodies’ location, better models of reservoir distribution
can be made leading to an enhanced field development plan.
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