About Strategic Environmental Assessment (SEA) data

Strategic Environmental Areas map.

The Department of Trade and Industry (now BEIS) began a sequence of sectoral SEAs of the implications of further licensing of the UK Continental Shelf (UKCS) for oil and gas exploration and production in 1999.

The SEA Process subdivided the UKCS into eight areas shown on the adjacent map and listed below; beginning in 2008, integrated Offshore Energy SEAs have been undertaken that cover the whole UKCS.

An integral part of the SEA programme has been a series of research and monitoring surveys commissioned to acquire new data about the offshore environment and used to help inform the relevant SEAs.

Technical reports describing the surveys are available from Offshore Energy SEA and also from this site.

To enable free and open access to data collected during the SEA surveys, BEIS has commissioned BGS to develop and maintain this data portal with the aim of providing all reports and datasets associated with each SEA.

Name Area Sector Licensing/Leasing Round Year
SEA 1 The deep water area along the UK and Faroese boundary Oil & Gas 19th Round 2001
SEA 2 The central spine of the North Sea which contains the majority of existing UK oil and gas fields Oil & Gas 20th Round 2002
SEA 2 Extension Outer Moray Firth Oil & Gas 20th Round 2002
SEA 3 The remaining parts of the southern North Sea Oil & Gas 21st Round 2003
R2 Three strategic regions off the coasts of England and Wales in relation to a second round of offshore wind leasing Offshore wind R2 2003
SEA 4 The offshore areas to the north and west of Shetland and Orkney Oil & Gas 22nd Round 2004
SEA 5 Parts of the northern and central North Sea to the east of the Scottish mainland, Orkney and Shetland Oil & Gas 23rd Round 2005
SEA 6 Parts of the Irish Sea Oil & Gas 24th Round 2006
SEA 7 The offshore areas to the west of Scotland Oil & Gas 25th Round 2008
OESEA UK offshore waters and territorial waters of England and Wales Offshore wind
Oil & Gas
26th Round 2009
OESEA2 UK offshore waters and territorial waters of England and Wales Oil & Gas, Offshore wind, wave and tidal, gas and carbon dioxide storage 27th Round
28th Round
OESEA3 UK offshore waters and territorial waters of England and Wales Oil & Gas, Offshore wind, wave and tidal, gas and carbon dioxide storage 29th Round
Supplementary Round
30th Round


Data types

The following data types are available:

  • data files (in a variety of specialist formats)
  • maps
  • processed data
  • processed images
  • raw data
  • raw images
  • still images – photographs
  • reports
  • video

Data access

The data available from this website were produced as part of the Department for Business, Energy & Industrial Strategy's Offshore Energy Strategic Environmental Assessment programme; Crown Copyright, all rights reserved. The BEIS SEA must be acknowledged in any maps or publications that make use of the data. All the data files are freely available to the public.

Many files can be downloaded directly from this website. Those that are too large to download can be ordered via the website for postal delivery from BGS.


BGS (NERC) has been contracted by BEIS to publish SEA datasets on its behalf.

All intellectual property rights (including , without limitation, copyrights, database rights and all other rights which subsist or may at any time in the future subsist in the Dataset(s)) in the Dataset(s) ('Intellectual Property Rights') are owned by BEIS (formerly the Department of Trade and Industry, and the Department for Business, Enterprise and Regulatory Reform).

BGS has been authorised by BEIS to use SEA datasets for all purposes but on a 'not-for-profit basis'.

BGS has been authorised by BEIS to pass on SEA datasets to third parties so that they can use them for all purposes but on a 'not-for-profit' basis.


Contact offshoredata@bgs.ac.uk for further information