Ain Tsila is a gas condensate field situated in the Illizi Basin, Algeria, located within the Isarene permit in Blocks 228 and 229a. The Ain Tsila field boasts reserves amounting to 2.1 trillion cubic feet of sales gas, alongside 67 million barrels of condensate and 108 million barrels of liquefied petroleum gas (LPG). Discovered in 2009 through the successful drilling of the Ain Tsila-1 well, this gas condensate field garnered significant recognition, ranking as the ninth-largest discovery globally for that year. Spanning an extensive area exceeding 1,000 square kilometers, Ain Tsila represents a substantial addition to the energy landscape.

The North Field South (NFS) project is part of the larger North Field Expansion project. The project is divided into two phases, with phase one involving the development of the North Field East (NFE), while phase two will see to the development of the NFS. It will include five production platforms, 50 wells and gas pipelines to an onshore processing complex.