Shell Oil doesn't shilly-shally around as it explores for, produces, and markets oil, and natural gas, and produces and markets chemicals. The company's Shell Exploration & Production unit focuses its exploration on the deepwater plays in the Gulf of Mexico. Shell Oil partners with Saudi Aramco in a US refining and marketing venture (Motiva) and owns Motiva's sister company Shell Oil Products US. Shell Oil also produces petrochemicals (Shell Chemical) and liquefied natural gas (Shell US Gas & Power) and markets natural gas and electricity. Shell Oil's parent, Royal Dutch Shell, vies with Exxon Mobil) to be the world's #1 integrated oil company in terms of revenues.