1650s, past participle adjective from alternative past participle (originally in Scottish legal use) of prove (v).

proved: established beyond doubt; "a proven liar"; "a Soviet leader of proven shrewdness" (prove) be shown or be found to be; "She prov [..]

Petroleum Reserves which have a 10% or greater probability of being recovered (as determined in accordance with the guidelines of the Society of Petroleum Engineers).

(v) be shown or be found to be(v) establish the validity of something, as by an example, explanation or experiment(v) provide evidence for(v) prove formally; demonstrate by a mathematical, formal proo [..]

When the magistrate has found you guilty of committing the offence.

Proven and probable reserves plus reserves that are deemed possible (at least 10 per cent likely) to be commercially recoverable. Also known as 3P or P10 reserves.

Reserves which on the available evidence are virtually certain to be technically and economically producible. For the purpose of this definition it has a better than 90% chance of being produced

Proven, Probable plus Possible reserves (3P) are those reserves that, to a low degree of certainty (10% confidence), are recoverable. There is relatively high risk associated with these reserves.

Those quantities of hydrocarbons which are estimated, on a given date, to be potentially recoverable from known accumulations, but which are not currently considered to be commercially recoverable. Co [..]