It's not necessarily the oil standard, but Exxon Mobil is one of the world's largest integrated oil companies (with
Royal Dutch Shell
) engaging in oil and gas exploration, production, supply, transportation, and marketing. In 2015 it had proved reserves of 24.7 billion barrels of oil equivalent, including oil sands assets through
. Exxon Mobil's 23 refineries in 14 countries have a throughput capacity of 5 million barrels per day and daily lubricant basestock manufacturing capacity of 136,000 barrels. It supplies refined products to more than 19,000 gas stations worldwide and is a major petrochemical producer. In 2016 Exxon Mobil CEO Rex Tillerson was nominated to be US Secretary of State.