Saudi Aramco, the world's biggest oil company, has started producing tight gas from the South Ghawar formation two months ahead of schedule, its second production of unconventional gas after the delivery from the North Arabia field in 2018. Not registered? Receive daily email alerts, subscriber notes & personalize your experience. "Aramco ... has successfully produced the first unconventional tight gas from its South Ghawar operational area two months ahead of schedule," the company said Nov. 14.