The Trinidad basin in Trinidad & Tobago has over a century of exploration history, with over 2.67 billion barrels of reserves discovered. However, in recent years explorers have struggled to create value due to the small discovery sizes and low remaining prospectivity of this mature basin. PSC terms were introduced for the 2010 and subsequent licence rounds, which reduced government profit share and allow improved economics for discoveries. Explorers further benefit from low development costs and short lead times due to the abundant infrastructure in the basin. Within the basin the southern sub-basin play covers southern Trinidad, an important oil producing province (second only to the Columbus basin) and yields most of Trinidad's onshore fields plus the majority of the offshore Gulf of Paria fields. Our outlook in this report is confined solely to the oil play in this southern sub-basin; we identify the remaining yet-to-find resource and analyse the returns possible.