Fluid Properties Calculator

Calculate density, velocity, and bulk modulus for brine, oil, and gas at reservoir pressure and temperature conditions. Uses Batzle-Wang (1992) empirical relationships for accurate fluid property estimation.

Batzle-Wang Fluid Properties Density Velocity

Input Parameters

Fluid Type

Select Fluid

Reservoir Conditions

Temperature

°C

Valid range: 0-200°C

Pressure

MPa

Valid range: 0.1-200 MPa

Brine Properties

Salinity

ppm

0 = pure water, 35000 = seawater, 300000 = brine

Oil Properties

API Gravity

°API

Light: >31, Medium: 22-31, Heavy: <22

Gas-Oil Ratio (GOR)

scf/bbl

Typical range: 50-500

Gas Properties

Gas Specific Gravity

(air=1)

Typical natural gas: 0.6-0.7

Quick Presets

Results

Theory & References

Batzle-Wang Equations

Empirical relationships for calculating fluid properties at reservoir conditions:

Brine: Accounts for salinity, pressure, and temperature effects
Oil: Function of API gravity, GOR, P, and T
Gas: Real gas equation with compressibility factor

Valid ranges:

Temperature: 0-200°C
Pressure: 0-200 MPa
Salinity: 0-300,000 ppm
API: 5-60°

Applications

Rock Physics: Input for Gassmann fluid substitution
AVO Modeling: Fluid properties affect reflectivity
Well Planning: Predict formation pressures
Reservoir Engineering: PVT analysis
QC: Validate lab measurements