80,000,000,000=3,653,000 bpd for 60 years
Eh, it doesn't work that way.
In place volumes are never what one would recover from a discovery. Not on any field I have ever heard of anyway.
And this is a shale, which actually do not produce much of anything. Most of what people call 'shales' are not what produces, but the fraccable components within some of the shales. Some Shales have nothing that can produce, so until we see some actual flowrates, we have no reserves in the ground at all.
And the amount of gas associated with this oil is incredibly small at only 175 scf per bbl of oil in place. I have never to date seen any unconventional oils produce at such low gas oil ratios. One of the key components, and there are several other critical ones, is that one must have lots of gas associated with the oil in order for oil to flow through the incredibly low permeability matrix and fractures. I suspect that recovery rates are much less than 10% of the oil in place, and may be non-existent.
Lastly, this is offshore. I have not seen much in the way of offshore shales produce. This is mainly due to the high capital costs, need for all of the infrastructure needed for the required liquids and sand volumes, etc.
So in a word, this just might be hoopla, although I hope they are successful.