Ann: Mukuyu-2 Drilling Update, page-456

We need to know the net pay rather than the gross pay and also the type of hydrocarbons to get a more accurate idea.

But @VOGC was working on 170 BCF per metre of net pay column height for the recoverable gas resource (assuming the net pay is consistent across the full 200km2 closure at the Upper Angwa target).

To get liquids content, Invictus were originally working on a GCR (gas condensate ratio) of 44 mmbbls/mmscf. But from the mud gas data analysis this could actually be as high as 135 mmbbls/mmscf.

So even if the 225m of gross hydrocarbons was only 25% net pay this would be 56m net pay x 170 BCF per m column height = 9.5 TCF. Plus 44 mmbbls/mmscf = 418mmbbls of condensate (or over 1 bil barrels if it was as rich as the mud gas data indicated).