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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
Journal of Petroleum Geology, vol.
SOLUTION SEAMS IN THE MAMUNIYAT FORMATION,
EL-SHARARA-A FIELD, SW LIBYA:
IMPACT ON RESERVOIR PERFORMANCE
K. Mohammed1,2, P. W. M. Corbett1*, D. Bowen1,3,
A. R. Gardiner1 and J. Buckman1
1Department of Petroleum Engineering, Heriot-Watt University, Edinburgh, EH14 4AS.
2 Repsol Oil Operations, Tripoli, Libya.
3Now Core Labs, Jakarta, Indonesia.
*Author for Correspondence: [email protected]
Solution seams have been identified as a significant component in the Ashgillian (Upper
Ordovician) Mamuniyat Formation sandstone reservoir in the El-Sharara-A field (SW
Libya). They have been observed in cores with a frequency of up to 25 solution seams per
metre, and they have a permeability of 1-6mD in a reservoir whose permeability is
otherwise 100-1,000mD. The reservoir sandstones (quartz arenites) were deposited as
shallow-marine shoreline sands associated with glacial outwash deposits. The potential of
solution seams to act as permeability baffles has not previously been considered in reservoir
engineering models of this field. In this study, by measurement of permeability and
subsequent reservoir simulation, we show that solution seams are likely to have had a
negligible effect on effective horizontal permeability, and a small but positive effect on
vertical sweep efficiency (due to reduced vertical permeability). Solution seams are present
in many Palaeozoic reservoirs in North Africa, and may be particularly significant (in terms
of their effect on production) in relatively poor quality reservoirs.
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