But now, after about $250 billion of investment and the discovery of some of the world's largest offshore oil and gas resources, Petrobras is producing 2.8 million boepd, 20 percent less than its estimate for 2012 output.
In the context of the input sentence, determine the relationship between 'Petrobras' and 'gas'.
Options: distributed by, distribution format, chief executive officer, product/material produced