Following on from this, Calub discovery in Ethiopia was discovered in 70's but only just starting to produce now. Ranging from 2.7-4.7 TCF across these fields, conventional play with approx 12% porosity (lower than IVZ data suggest for Cabora Bassa). Serious project attracting capex of $4bn+. Looks like a reasonable comparison or a guide for what we want to see as things progress. Some light reading below:
https://sites.google.com/site/linkstogeologyofethiopia/Mineral/calub-hilala-fields
