Reservoir Volume Calculator

Estimate original oil or gas in place using volumetric method.

Drainage Area

acres

Net Pay Thickness

Porosity

Water Saturation

Formation Volume Factor

rb/stb

Recovery Factor

Tab to move between fields

Original Oil in Place

20,854,499 bbl

Recoverable Reserves

6,256,350 bbl

Bulk Volume32,000 acre-ft

Pore Volume4,800 acre-ft

HC Pore Volume3,360 acre-ft

How to Use This Calculator

Enter reservoir area (acres), net pay thickness (ft), porosity (%), and water saturation (%).
Enter formation volume factor (bbl/STB for oil or mcf/scf for gas).
Read original oil in place (OOIP in STB) or original gas in place (OGIP in Bcf).
Apply recovery factor (%) to estimate recoverable reserves.
Compare volumetric estimate against material balance results for consistency.

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