PEL 186 lies in the western Otway Basin and includes portions of the Penola, Robe and St Clair Troughs.

Somerton considers the tenement to be prospective for a wide variety of oil and gas plays, but will particularly focus on evaluating unconventional plays within the Casterton and lower Pretty Hill Formations.  More than 800 sq. km of the tenement is currently interpreted to lie within the Casterton prospective fairway. 

Somerton plans to acquire 3D sesimic and drill one exploration well in PEL 186 in 2012.