UK North Sea data can be downloaded from the website for the Department for Energy and Climate Change (DECC), which was previously part of the Department for Business, Enterprise and Regulatory Reform (BERR), which was previously the Department for Trade and Industry (DTI). I do wish they'd stop changing the name . The specific page you want is the Oil and Gas Section's Maps and GIS Shapefiles and select Offshore.
Norwegian North Sea data can be downloaded from the Norwegian Petroleum Directorate's Factmaps and Factpages, complete with excellent metadata.
Can anyone else provide links for the remaining countries? They are Denmark, Germany and the Netherlands.
Edited by Emily Martin, 12 August 2009 - 09:00 AM.