The Mariner Field was discovered in 1981 c 150km E of Shetland, as an ultra-heavy oil prospect in two Paleocene reservoirs; the Heimdal Sandstone at c 1230m depth and the Maureen Formation at c 1500m depth. The seabed is c 110m deep. The two major owners are Equinor and JX Nippon.
First oil was produced in Aug 2019 and this is piped after dilution to Mariner B, an FSU.
Jul 18, 2025 · CHC Helicopter was awarded 3-year contract from Equinor to support its Mariner and Rosebank fields in the North Sea with S-92 and H175 helicopters from Aberdeen, Scotland