Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

OOIP (m3)

Original oil in place at stock-tank conditions.

Recovery factor

Expected recovery factor as a fraction.

Compute recoverable reserves as original oil in place multiplied by the recovery factor. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Recoverable reserves (m3)

Recoverable reserves at stock-tank conditions.

• Petroleum correlations are fluid-, pressure-, temperature-, and region-dependent. PVT sampling, phase behavior, relative permeability, capillary pressure, heterogeneity, aquifer support, well constraints, history match, and units affect forecasts and reserves.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Recovery Factor Calculator

  Compute the recovery factor as cumulative produced volume divided by original oil in place.

• Material Balance Oil Initially In Place Calculator

  Estimate the volumetric oil initially in place from drainage area, net thickness, porosity, water saturation and oil formation volume factor.

• Bearing Capacity Factor Ngamma Calculator

  Unit-weight bearing capacity factor Ngamma = 2 * (Nq + 1) * tan(phi) with Nq = tan^2(45 + phi/2) * exp(pi * tan(phi)); this is the Vesic (1973) convention, which differs from Terzaghi's and Meyerhof's original third factors. Equals 0 at phi = 0.