As I understand it, no, at least not formally. From what I have read, 3,4 or more are required for each field. Apparently there are strict guidlines in the US before a company can report proven reserves. There was talk recently of changing the guide lines for shale oil to provide new valuations and reserve requirements for companies that own oil sands properties in Canada.
In block 1, several things are happenning. The first is that it is apparent that CVX is releasing as little info as possible. The second, in my opinion, is that CVX has a very good idea of the amount of oil that is in block one. They had estimates prior to drilling based on seismic, but they have much more accurate estimates of field sizes now. OBO1 verified the seismic, showing which layer of gas/oil/water is where in their block, and probably gave them a pretty good idea about the rest of the JDZ.
Initially there were many rumors reported from everyone from the drill forman to other companies that the find was huge. I don't know about huge, but I think their find is very large by todays standards. My guess is at least a billion barrels, and probably several times that. I would also guess that we will not know the truth about Block one for years.
Proven reserves require a set of strick information standards for the investment community, but I would bet that CVX has a fairly accurate estimate of what that will be right now.
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