US supermajor Chevron has chosen two deep-water gas fields to underpin the fourth-train expansion of its Gorgon LNG project in Australia. Chandon in block WA-268-P and Geryon in block WA-22-R will be exploited via subsea developments, it is understood.New large-diameter subsea gas pipelines will be required to bring the feedstock gas to the LNG plant on Barrow Island. The assets were selected from a stable of discoveries in the Greater Gorgon area. They are “high deliverability and low carbon dioxide gas fields”, said Chevron. Front-end engineering and design is expected to begin later this year. KBR, which leads the Kellogg joint venture building the foundation three-train project, has previously done pre-FEED work on the fourth train. The latest unit will be identical to the first three with capacity of 5.2 million tonnes per annum. The expansion will also require an additional LNG storage tank. Chevron said: “A replica LNG train and lessons learned (from the foundation project) increases our project execution confidence.”