The Enfield and Vincent heavy oil fields are developed separately via stand-alone FPSO's, but are ring-fenced for taxation purposes (Enfield Area). The fields are located in the Exmouth Sub-Basin, in close proximity to the Stybarrow, Van Gogh, Coniston-Novara and Pyrenees Area developments. Vincent was discovered in 1998 and Enfield in 1999, both by Woodside Petroleum. The Final Investment Decision (FID) was made on Enfield in 2004. The field was brought onstream in July 2006.