Focus on Gulf of Mexico

Gulf Coast Package - Prospects Highly prospective portfolio based on new proprietary 3D seismic Prospective Resources¹ Prospect Name Working Interest Net Revenue Interest Probability of Success 100% MMboe Otto Net Revenue Interest P90 P50 Mean P10 P90 P50 Mean P10 Big Tex 37.50% 29.51% 54% 0.5 3.3 6.8 16.9 0.1 1.0 2.0 5.0 Lightning 37.50% 28.50% 45% 0.9 3.2 4.4 10.1 0.3 0.9 1.3 2.9 Don Julio 2 37.50% 28.50% 44% 0.7 2.5 4.0 9.6 0.2 0.7 1.1 2.7 Mustang 37.50% 30.00% 56% 2.9 6.7 8.5 16.8 0.8 1.9 2.6 4.8 Beluga 37.50% 28.50% 45% 0.8 2.9 4.7 11.2 0.2 0.9 1.3 3.4 Oil Lake 37.50% 29.06% 45% 1.2 3.3 4.4 9.3 0.3 1.0 1.3 2.7 Tarpon 37.50% 29.06% 34% 7.7 24.0 35.6 81.0 2.2 7.0 10.3 23.5 Mallard 37.50% 29.63% 64% 0.2 0.9 3.3 4.5 0.1 0.3 1.0 1.3 1 Prospective Resources Cautionary Statement The estimated quantities of petroleum that may potentially be recovered by the application of future development projects relate to undiscovered accumulations. These estimates have both an associated risk of discovery and a risk of development. Further appraisal and evaluation is required to determine the existence of a significant quantity of potentially moveable hydrocarbons. OTTO ENERGY | ASX: OEL Refer to the ASX announcement dated 31 July 2018 for further information on prospective resources disclosure. 7

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