19 Apr 2012
West African Transform Margin Exploration Update
Tullow Oil plc (Tullow) announces that the Mercury-2
exploratory appraisal well in Sierra Leone and the Kosrou-1
exploration well in Côte d'Ivoire have both encountered
water bearing reservoirs with oil shows.
Mercury-2 - Sierra Leone
The Mercury-2 well was drilled 12 kilometres northwest of
the Mercury-1 oil discovery, targeting an area where the
extensive 3D seismic coverage indicated a high probability
of finding thick reservoir quality sandstones. It
intersected over 270 metres of reservoir quality sandstones
which were water bearing with oil shows at this location.
The Discoverer Spirit drillship drilled Mercury-2 to a
final depth of 5,142 metres in water depths of 1,815
Anadarko (55%) is Operator of offshore Block SL-07B-11
along with partners Repsol (25%) and Tullow (20%).
Kosrou-1 - Côte d'Ivoire
The Kosrou-1 well was drilled in the CI-105 block, 17
kilometres east south east of the previous South Grand
Lahou-1 well, targeting a channel system identified on the
3D seismic survey acquired in 2010. It intersected 90
metres of reservoir quality sandstones with oil shows in
the primary target and over 120 metres in total in the
The Eirik Raude semi-submersible drilled Kosrou-1 to a
final depth of 5,241 metres in water depths of 2,275
metres. On completion of operations the rig will return to
the Paon-1 location to complete the drilling of that well.
Paon-1 is a high impact prospect which is geologically
independent from Kosrou and closer to our discoveries in
Anadarko (50%) is Operator of offshore Block CI-105 along
with partners Tullow (22%), Petroci (15%) and Thani (13%).
Commenting today, Angus McCoss, Exploration Director,
"Kosrou-1 and Mercury-2 encountered significant reservoir
sands which were water bearing with oil shows. The
existence of thick sandstone fairways and a working
hydrocarbon system, proven by every well in our exploration
campaign, mean that our West African Transform Margin
acreage remains highly prospective. The well data will now
be integrated into our regional models to improve our
chances of making a hub-class discovery with the ongoing
campaign which includes the Strontium-1 well in Liberia and
the Paon-1 well in Côte d'Ivoire.
For further information contact:
Tullow Oil plc
(+44 20 3249 9000)
Citigate Dewe Rogerson
(+44 207 638 9571)
(+353 1 498 0300)