Overall oil, condensate, natural gas liquids and gas output stood at 0.612 million standard cubic metres per day, equivalent to 3.85 million barrels of oil equivalent.
Natural gas production in May fell to 296.9 million cubic metres (mcm) per day from 322.2 mcm a year earlier, and slightly exceeded a forecast of 296.1 mcm by 0.3 per cent, the regulator said on its website.