The Mariner field including Cadet and Mariner East is located approximately 100 miles east of the Shetland Islands. The Mariner field came onstream on 15 August 2019. The field is operated by Equinor (65.1%) with NEO Energy (20.0%), ONE-Dyas (6.0%) and Ithaca Energy holding 8.9% non-operated interest. Ithaca Energy acquired its interest through its acquisition of Siccar Point Energy in June 2022.
The Mariner field consists of a production, drilling and living quarters (PDQ) platform based on a steel jacket and a floating oil storage unit (FSU). The field currently produces mainly from the Maureen reservoir with production from the larger and heavier Heimdal reservoir only starting in 2021. Given the large volumes of oil remaining in place there is an extensive multiyear drilling program on the asset to improve recovery from all reservoirs.Polymer flooding trials are proposed on the asset to further increase recovery.