Comparison Using the existing math of what AOI "paid" ECO for 1% of 3b/4b vs Orinduk. Both are speculative however Guyana is shallow so costs are about half.
So AOI paid roughly $8 million USD for 1% of 3b, so 800,000,000 for the SA block that may hold 4 billion barrels in deep water.
Guyana if I remember correctly should hold around 2-4 billion light in the Cretaceous. It also has half the capex required. So using 2 billion it'd be worth 400,000,000. Then at half the cost it'd be worth 800,000,000. Take into account that Hammerhead is being developed and will have unitization/ has proven commercial oil Id put Orinduik at $ 1 billion.
Eco wants a carry so that's 50 million per well at say 20% so 10 million in cost.
3 carries (2 exploration, 1 appraisal) is 30 million for 80% of a billion dollar asset.