The maximum recoverable volume of Oil Initial In Place (OIIP).) which is assumed by the current Field Development Plan (FDP) as being possible to be recovered with positive profitability:
STOIIP = EUOR + Non-recoverable Oil Reserves
Unlike Oil Initial In Place (OIIP) which is a geological category, the concept of Estimated Ultimate Oil Recovery (EUOR) depends on FDP and Petroleum Production specifics (recovery method, recovery duration, surface logistics, market conditions and economics).
...
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir / Petroleum Reservoir Fluids / Oil Initial In Place (OIIP) / Stock-Tank Oil Initial In-Place (STOIIP)
[ Non-recoverable Oil Reserves ]