Oil Exploration is one of the toughest markets to crack imho when it comes to investing...Look up DESIRE they currently have the Falklands contract..To give you an idea of there share price movement over the last few weeks they have gone from 50p to 1.30p and down to 45p.......

What your hearing is known in the trade as "Ramping" and its not unheard of in the Oil Markets...Unfortunalty for most private investors you get to hear about it too late hence why you now know the stock has doubled..

Best of luck

Edit to add your GKP graph for the last 12 mths