// multi-utility computation suite · offline · instant · precise
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sci.material-balance-volumetric-OOIP Calculator
Calculates Original Oil In Place (OOIP) from volumetric method: OOIP = V_bulk × φ × S_o / B_oi. A 1 km² reservoir 50 m thick with φ = 20%, So = 70%, and Boi = 1.1 gives OOIP ≈ 6.4 million bbl — recovery factors for primary production are typically 10–30%.
Inputs
Phi Pct
Reference formula or conversion factor shown for context.
Sw Pct
Reference formula or conversion factor shown for context.
Bo Res Bbl
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Np Mstb
Reference formula or conversion factor shown for context.
Boi Initial
Reference formula or conversion factor shown for context.
A Acres
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
H Ft
Reference formula or conversion factor shown for context.
Results
OOIP (STB)
Reference formula or conversion factor shown for context.
OOIP (m³)
Reference formula or conversion factor shown for context.
recovery factor RF (%)
A dimensionless multiplier applied in the calculation.
OOIP = A·h·φ·(1−Sw)/Boi
Reference formula or conversion factor shown for context.
produced Np (STB)
Sample size or count used in the calculation.
recovery class
The classification assigned based on the computed value.