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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Reservoir
in Sabiriyah Field, North Kuwait
1 Field Development (SA/BA), Kuwait Oil Company, PO Box 9758 Ahmadi, Kuwait,
61008, Kuwait, phone: (965) 3981110 Ext 71744, fax: (965) 3980676, [email protected]
2 Field Development (SA/BA), KOC, Kuwait Oil Company, PO Box 9758 Ahmadi, Kuwait, 61008, Kuwait
The Burgan formation in Sabiriyah field, a layered clastic reservoir
deposited in Lower Cretaceous time is underlain and
overlain by Shuaiba and Mauddud carbonates. The
reservoir
is divided into lower, middle and upper Burgan. Lower Burgan
the most prolific of the three consists of lower massive sands and upper layered channel sands. The lower massive sand
section more than 250ft in thickness consists of medium to coarse grained well sorted sand deposited by fluvial system.
The upper sand shale intercalated section comprising of relatively of less thickness and lower quality of
reservoir
is
interpreted to be deposited under estuarine and river channel system where the marine influence increases towards top of
the
reservoir
.
The reservoir
is under production for more than four decades and as on date most of the oil reserves of the massive section
is produced. The major share of present day production is from layered upper section where most of available reserve lies
in. Both massive and layered reservoirs are produced under natural active water
drive
energy. The encroachment of
formation water in producing wells and limited surface facilities for handling produced water along with sands of limited
aerial extent poses a great challenge in predicting infill drilling locations having good
reservoir
quality and thickness.
Detailed geological studies on cores cut in recently drilled wells leading to better understanding of depositional system
upgraded the existing geological knowledge of the
reservoir
. Analysis done on cores for rock and fluid properties along with
advanced logging techniques adopted and periodical mapping of water encroachment pattern down to the level of flow units
have resulted in aggressive infill drilling plan. The development scheme of the
reservoir
has been modified and resulted in
accretion of production and reserves.