Take context from the input text and decide on the accurate relationship between 'Petrobras' and 'gas' from the options provided.
Options: developer, legal form, operator, product/material produced

By the end of 2012, Petrobras said, it would be producing 3.5 million barrels of oil and equivalent natural gas per day (boepd) worldwide, and by 2015 4.6 million boepd, making it one of the world's largest producers.
product/material produced