Oil rigs and supply vessels at seagettyThe theme of oil and gas majors exiting the North Sea and independents stepping in to occupy the space is continuing unabated, with the latest example coming from the Dutch sector of the ageing and tax burdened hydrocarbon basin.On Friday, yet another eye-catching deal emerged on the horizon after Canadian independent Tenaz Energy agreed to acquire NAM Offshore - or Nederlandse Aardolie Maatschappij - a 50:50 joint venture between Shell and ExxonMobil.The €165 million ...