The Mariner and Cadet Fields are located 150 km east of the Shetland Islands. Siccar Point acquired its 8.89% non-operated interest in the fields from JX Nippon in August 2016.
The Mainer Field came onstream 15 August 2019, and is one of the four largest fields by remaining reserves in the UK and is situated on the edge of the East Shetland Platform. It has an expected field life of over 30 years and the initial development phase is expected to contribute more than 300 million barrels. The field consists of a production, drilling and living quarters (PDQ) platform based on a steel jacket with a floating oil storage unit (FSU).
The Mariner reservoirs have up to 3 billion barrels of oil in place, a 50% increase on what was originally assumed at the time of project sanction. The operator has already increased the recoverable reserves by 20%. With significant volumes in place there is the clear potential to substantially increase the oil recovery from the field. The operator is proactively seeking opportunities to do so through the application of new technology, additional drilling and future tie-back opportunities.
Mariner has two main reservoir units: both are Tertiary sand sequences of excellent quality. The older sands, known as the Maureen, are comprised of stacked deltas and slope sediments. The Heimdal sands lie above the Maureen and are also deltaic and slope sediments but in addition have undergone soft-sediment remobilisation and now form distinct stratigraphic ‘geobodies’. Recently acquired 3D seismic has enabled detailed reservoir mapping for both reservoirs with the Heimdal ‘geobodies’ now being mapable as distinct volumes. Two exploration wells drilled in 2017 encountered oil filled Heimdal 'geobodies'. This confims that additional 'geobodies' exist outside the main field area.
Cadet was discovered in 1984 with oil in the Heimdal reservoir. It is situated less than 5 km west of Mariner and will be developed as part of the main Mariner Field development.
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The Mariner East Field is located south east to the Mariner Field. Siccar Point acquired its 8.89% non-operated interest in this field from JX Nippon in August 2016.
Oil was discovered in Mariner East in 1997 in both the Maureen and Heimdal reservoirs. Mariner East lies 5 km to the south-east of Mariner. The field is expected to be developed as a sub-sea tie back to the main Mariner PDQ.
The P.2508 Licence was acquired from a successful bid by the Mariner partnership in the UKCS 32nd Licence Round. It is located directly east of Mariner and includes an extension of the Mariner East Field as well as a small Maureen discovery which could form part of the Mariner East tie-back development.