Tanager-117 Feb 2021 20:08
Tanager
The Tanager well was drilled to a total depth of 7,633m in a water depth of
2,900m. The well results were announced on 17th November, as an oil discovery
that is non-commercial on a standalone basis. The discovery is close to Exxon’s
Ranger discovery on the Staebroek block and there are a number of derisked
prospects on the Kaieteur block, which means that there is a strong chance that
this area could be a hub for an FPSO development.
The well was successful in proving that the source kitchen exists on the block and
there is a substantial working oil system present. The well found much more
sandstone and of a higher quality than expected in the entire prospective section
and in particular in the Maastrichtian reservoir target: 16m of net oil pay was
encountered in an interval which had a pre-drill best case gross prospective
resource of 37.5mmbl. This was based on a Best Estimate of 8m of net pay.
According to the updated CPR, Tanager is now estimated to be a 65.3mmbbl oil
discovery (2C) in the mid-case (“Best Estimate”), almost double the pre-drill
estimate for the interval and in line with our post-drill estimate of 50-100mmbbl.
The High Case (3C) is 131mmbbl. Part of the discovery lies on the neighbouring
Staebroek block, also operated by Exxon, which would be beneficial and simplify
any development. The 2C resource that lies on the Kaieteur block is 43mmbbl
gross or 10.7mmbbl net to Ratio.
There were several stacked deeper targets in the Santonian and Turonian
intervals where high quality reservoirs (>400m of sandstones) were encountered,
and reservoir fluids were found but it has not been established what fluids were
encountered and further analysis is still being carried out. The reason that these
prospects were unsuccessful was likely due to the structural trapping mechanism
failing and the oil migrating up to the Maastrichtian. As a result, it appears that
the trap integrity risk has been increased for some of the deeper targets in the new
CPR.