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.

Pressure (Pa)

Absolute gas pressure.

Temperature (K)

Absolute gas temperature.

Gas gravity

Specific gravity of the gas (air = 1).

Z factor

Gas compressibility factor at the given conditions.

Compute natural-gas density from the real-gas law using gas gravity and a compressibility 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]

Density (kg/m3)

Gas density in kilograms per cubic metre.

• Geotechnical correlations and idealized failure models depend on stratigraphy, sampling disturbance, drainage, stress history, groundwater, density, anisotropy, scale, construction sequence, and laboratory or field method. Site-specific design requires investigation and code factors.
• 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.

• Gas Compressibility Factor Z Calculator

  Compute the natural-gas compressibility factor with Sutton pseudo-critical properties and the Dranchuk-Abou-Kassem method.

• Material Balance Gas Initially In Place Calculator

  Estimate the volumetric gas initially in place from pore volume and the real-gas formation volume factor Bg at standard conditions of 101325 Pa and 288.15 K.

• Bubble Point Pressure Vasquez Beggs Calculator

  Invert the Vasquez-Beggs solution-GOR correlation to obtain the bubble point pressure; pass the separator-corrected gas gravity.