Gas field · UK
South Sean
South Sean is a gas field in the southern North Sea, operated by ONE-Dyas. It was discovered in 1970 and produced from 1986 to 2026. Production has ceased. From May 2017, when its monthly records begin, it produced about 2.3 billion cubic metres of gas.
Production
South Sean produced about 131,000 barrels of oil and condensate and 2.3 billion cubic metres of gas between May 2017 and February 2026. The NSTA's monthly records for the field begin in May 2017, but it started producing in August 1986, so earlier output isn't included.
Latest: 0 million cubic metres a day in February 2026. Highest year: 2018, averaging 1.2 million cubic metres a day. Highest month: July 2018.
Latest: under 1 barrels a day in February 2026. Highest year: 2019, averaging 66 barrels a day. Highest month: July 2018.
Average production by year
| Year | Oil and condensate, barrels a day | Gas, million m³ a day |
|---|---|---|
| 2026 (Jan–Feb) | 9 | under 0.001 |
| 2025 | 28 | 0.35 |
| 2024 | 18 | 0.22 |
| 2023 | 36 | 0.45 |
| 2022 | 42 | 0.62 |
| 2021 | 36 | 0.83 |
| 2020 | 35 | 0.68 |
| 2019 | 66 | 1.2 |
| 2018 | 64 | 1.2 |
| 2017 (May–Dec) | 49 | 1.2 |
Field details
| Status | Production ceased |
|---|---|
| Type | Gas field |
| Operator | ONE-Dyas |
| Partners |
|
| Original operator | Shell |
| Discovered | January 1970 (well 49/25-2) |
| First production | August 1986 |
| Water depth | 31 m |
| Region | Southern North Sea |
| Wells inside the outline | 16 |
Platforms and installations
Licences
The field lies in these 3 current licences:
Nearby
- Fields within 10 km: North Sean (0.4 km), East Sean (1 km), Gawain (2.6 km), Indefatigable (5.4 km), North Davy (6.7 km), Corvette (6.8 km).
- Protected areas overlapping the field: Southern North Sea SAC.
Sources
Production: NSTA, UKCS field production reports (PPRS), monthly to July 2026. Field details, platforms, licences and wells: NSTA open data, as on the atlas map. Contains information provided by the North Sea Transition Authority and/or other third parties. Used under the NSTA Open User Licence.
Offshore Data Atlas converts the reported volumes to barrels and cubic metres a day (one cubic metre is 6.29 barrels). UK gas figures are all the gas produced, including gas used offshore as fuel, flared or put back into the reservoir.