Elke & Narwhal Fields, Licence P2482
Blocks 28/2a & 28/3a
In the 31st Seaward Licensing Round, the results of which were announced by the OGA on the 4th June 2019, Pharis Energy Ltd was awarded a 100% interest in licence P2482, containing blocks 28/2a and 28/3a, which cover the Elke and Narwhal discoveries.
The Narwhal field was discovered by well 28/2-1, which was drilled by Arco in 1993. The well encountered heavy oil in an Eocene Tay sandstone and a sample of 14° API oil was recovered. This interval was also logged and cored. The Narwhal field has an estimated oil in place of around 27 mmbbls.
The Elke field was discovered by well 28/3-1B which was drilled by Murphy in 2000. The Elke field is also a Tay sandstone reservoir but of a slightly different age to that encountered in the Narwhal well. A full logging suite was recorded, reservoir pressures were measured and oil samples were taken. Core was also recovered over the reservoir interval. The API gravity of the oil samples ranges from 12º to 15° and the oil viscosity is believed to lie in the range 300 to 800 cP. The Elke field has an oil in place of almost 200 mmbbls.
There are a number of low risk Tay sand prospects within the licence area with estimated prospective resources of oil in place of about 185 mmbbls; as well as a Jurassic and a Palaeocene prospect which together could have another 140 mmbbls of oil in place.
When taken together with the Pilot Main, Pilot South, Harbour, Blakeney, Feugh and Dandy discoveries, which lie less than twenty kilometres to the North West, there are about 640 mmbbls of heavy oil in place in high quality shallow sandstone reservoirs well suited to a steam flood. We envisage developing the Elke and Narwhal fields as part of a wider Western Platform Area Project centred on the Pilot field in Licence P2244 and Pharis Energy intends to create an integrated development concept to exploit this substantial resources base.
The Elke and Narwhal fields have significant bottom water, which reduces the effectiveness of conventional approaches to steam flooding. Based upon thermal reservoir simulation we have developed an approach to the steam flooding of fields with bottom water which achieves a significantly improved recovery factor relative to conventional steam floods. We believe with this modified steamflood technique we could recover about 110 mmbbls from Elke & Narwhal, whilst a hot waterflood of these discoveries would recover about 65 mmbbls.