Cairn, ConocoPhillips and their other joint venture partners confirmed that oil was discovered in the FAN-1 exploration well, located approximately 60 miles (97 km) offshore Senegal, in Northwest Africa. Further evaluation is required in order to determine commerciality.
The FAN-1 well, located in the Sangomar Deep block, was drilled to a total depth of 16,164 feet (4,927 meters) in approximately 4,700 feet (1,433 meters) of water and was targeting multiple stacked deepwater fans. Preliminary analysis indicates:
29m of net oil bearing reservoir in Cretaceous sandstones;
No water contact was encountered in a gross oil bearing interval of more than 500m;
Distinct oils types ranging from 28° API up to 41° API indicated so far from a number of oil samples recovered to surface;
Initial gross STOIIP estimates for the FAN-1 well range from P90, 250 mmbbls, P50, 950 mmbbls to P10, 2,500 mmbbls and are broadly in line with pre-drill STOIIP estimates.
There are no plans for immediate well testing. Further evaluation will now be required to calibrate the well with the existing 3D seismic in order to determine future plans and optimal follow up locations to determine the extent of the discovered resource.
Once operations are completed on the FAN-1 well, the rig will move to complete the second well, SNE-1 where the top hole has been drilled pending re-entry. This Shelf Edge Prospect targeting a dual objective in 1,100 m water depth is in the Sangomar Deep block.
The FAN-1 well was drilled using the semi-submersible drilling unit “Cajun Express”. It is the third well in Cairn’s North West Africa program and first in Senegal.
Cairn has a 40% Working Interest (WI) in three blocks offshore Senegal (Sangomar Deep, Sangomar Offshore and Rusifique) ConocoPhillips has 35% WI, FAR Ltd 15% WI and Petrosen, the national oil company of Senegal, 10% WI. The three blocks cover 7,490 km2.