Refer to the input text as context and select the correct relationship between 'Petrobras' and 'gas' from the available options.
Options: product/material produced, operator, developer, legal form

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