Gas-Oil Ratio (GOR) Calculator

Calculate the producing Gas-to-Oil Ratio (GOR) in petroleum reservoir engineering and fuel-to-two-stroke mixture ratios.

🛢️ Engineering

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Calculation performed instantly via mantranews24 verified mathematical model.

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What is the Gas-Oil Ratio?

In petroleum production and reservoir engineering, the producing Gas-Oil Ratio (GOR) quantifies the volume of standard gas liberated per unit volume of stock tank oil. GOR trends provide reservoir engineers with critical diagnostic insight into reservoir pressure depletion below bubble point (Pb).

Mathematical Formula & Methodology

The mathematical model underlying this tool operates on the following verified equation:

GOR = Gas Volume Produced (scf) / Stock Tank Oil Volume (stb)

Understanding the Parameters:

Total Gas Produced (standard cubic feet) (measured in scf) — Primary input variable.
Stock Tank Oil Produced (barrels) (measured in bbl) — Primary input variable.

How to Use This Calculator

Enter the measured standard cubic feet (scf) of natural gas and the corresponding stock tank barrels (bbl) produced during the measurement interval.

Worked Numerical Example

💡

Gas produced = 500,000 scf. Oil produced = 625 bbl. GOR = 500,000 / 625 = 800 scf/bbl. In reservoir categorization, a GOR below 2,000 scf/bbl characterizes an ordinary black oil reservoir.

Key Considerations & Standards

Reservoir Classifications: Black Oil (< 2,000 scf/bbl), Volatile Oil (2,000–3,300 scf/bbl), Gas Condensate (3,300–50,000 scf/bbl), Wet Gas (> 50,000 scf/bbl), Dry Gas (> 100,000 scf/bbl).

Frequently Asked Questions

What causes a sudden spike in producing GOR?

When bottomhole flowing pressure drops beneath bubble point pressure, free gas comes out of solution in the porous rock, causing rapid gas breakthrough and sharply rising GOR.

Can this tool calculate 2-stroke chainsaw / dirt bike gas-to-oil mixes?

For 2-stroke small engines (e.g. 50:1 or 40:1 mix), 50:1 equals 2.6 fluid ounces of 2-stroke oil per 1 US gallon of gasoline.