The Economist | Oil and gas supply disruptions ripple around the world The Economist CALL it the hydrocarbon equivalent of the butterfly effect. As oil and gas supplies tighten during the northern winter, disruptions as remote as a hairline fracture on a piece of Scottish pipeline, and an explosion in an Austrian natural-gas plant ... North Sea oil deliveries halted in first force majeure in decades Five main drivers of oil prices in the coming year Oil recovers on big US crude stock drawdown |