- STOIIP = Stock Tank Oil Initially In Place
- OOIP = Original Oil In Place, or
- STOOIP = Stock Tank Original Oil In Place

All of the above, essentially mean the volume of oil originally or initially present in a hydrocarbon reservoir expressed in equivalent volume that it would occupy in a stock tank at standard temperature and pressure.

Mathematically, it is expressed as:

STOIIP = BV *ϕ * (1-Swi) / Bo

where,

BV = Bulk Volume of the Reservoir

ϕ = Porosity (need to be Effective Porosity)

Swi = Initial Water Saturation

Bo = Formation Volume Factor

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