The carbon storage project was delayed by more than two years after Chevron discovered problems with valves and pipeline equipment during commissioning of the $1.7 billion injection system.
Gorgon is the biggest emitter of carbon emissions out of Australia's 10 LNG plants, with gas from the Gorgon field containing 14% CO2. Growth in LNG exports has been a big contributor to Australia's rising CO2 emissions, according to the Environment and Energy Department.
'We are pleased to reach the first milestone of safely starting the operation of the Gorgon carbon dioxide injection system, one of the world's largest greenhouse gas mitigation projects ever undertaken by industry,' Chevron Australia Managing Director Al Williams said in a statement.
The facility, which will be ramped up over several months, will reduce Gorgon's emissions by 40% over the life of the project, the company said.
Western Australia's state government approved the $54 billion Gorgon project in 2009 on condition that some CO2 from its gas processing operations would be stored.
Once fully up and running, between 3.4 million and 4 million tonnes a year of carbon dioxide will be buried, Chevron said.
Gorgon LNG is owned by Chevron, Exxon Mobil Corp, Royal Dutch Shell, and Japan's Osaka Gas, Tokyo Gas and JERA.