Consider Ormen Lange, a North Sea gas field shared by half a dozen oil giants.

ECONOMIST: Oil companies

Production has started at a recently discovered oil field in the UK Northern North Sea.

BBC: Dana Petroleum reports first oil from North Sea field

Oil operators have yet to indicate when production will resume at a North Sea field hit by recent severe weather.

BBC: Flare from platform

So, the next phase of North Sea and Atlantic development will respond to oil prices being higher and to a tax regime that encourages small field development.

BBC: Study predicts growth in oil and gas field numbers