Focus on Gulf of Mexico

Gulf Coast Package Potential Risked Portfolio Potential to materially increase Otto's US business Risked Summary data - 8 Well Portfolio, Gross (8/8ths) Metric P90 P50 P10 Volumes, MMBOE 4.63 19.86 64.59 Peak Production Rate, BOE/d 3,270 9,990 31,300 % Hydrocarbon Liquids per BOE 13% 28% 56% Finding cost, US$/BOE $13.62 $3.18 $0.98 Finding & Development cost, US$/BOE $16.40 $5.51 $2.56 Refer to the ASX announcement of 31 July 2018 for notes on the calculation of the risked portfolio information above. OTTO ENERGY | ASX: OEL 9

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