from the Envoi farmout documentation:
Unpublished analyses of Angwa Sandstone field samples evidence good reservoir parameters with measured porosity between 16% and 26% and permeabilities up to 1,178 mD. Seals for these key reservoir sands are prognosed to be the intraformational mudstones. The Pebbly Arkose, equally, contains good reservoir potential with 14% - 26% porosity and permeability up to 1,900 mD in outcrop samples with intraformational mudstone seals. Shallow mineral exploration bores in the Pebbly Arkose Formation suggest these mudstones could also be reasonably extensive.
According to this:
https://www.researchgate.net/publication/285179032_Porosity_and_Permeability“The porosities of petroleum reservoirs range from 5% to 30%, but most frequently are between 10% and 20%. Any porosity less than 5% is very seldom commercial, and any porosity more than 35% is extremely unusual.”
If we see above 15% as mentioned in the announcement I would suggest chance of commercial success would be much improved.
