Fracking technology has also enabled the US to tap its large shale-oil reserves, making it the world’s largest petroleum producer, ahead of Saudi Arabia. Citigroup estimates that, by 2020, oil will cost just $75 per barrel, and the former head of international forecasting at the OECD suggests that the number could be closer to $50.
水力压裂技术也使美国得以发掘其庞大的页岩油储量​​，使其成为领先沙特阿拉伯的世界第一大石油生产国。花旗集团预测到2020年石油售价将降至仅75美元一桶，而经合组合国际预测部前负责人认为石油价格将逼近每桶50美元。