Hydrocarbon Fluid Classification

              Black Oils

A low shrinkage reservoir fluid that is made up of heavy, non-volatile hydrocarbons. They are usually dark in colour indicating the presence of heavy hydrocarbons.

              Volatile Oils

Contain many intermediate components relative to black oils. They have high initial gas oil ratios with stock tank gravities 40° API or higher. The colour generally lighter than that of black oils, brown too orange. Gas associated with this fluid tends to be rich.


Similar to volatile oils in colour with gravities in the range of 40° to 60° API. Condensate gas is usually a gas within the reservoir on account of the reservoir temperature being greater than the critical temperature of the fluid.

              Wet Gas

This refers to natural gas that contains significant heavy hydrocarbons typically the rule of thumb is that if the gas contains less (than 85%) methane, more ethane and other more complex hydrocarbons then it is labelled a wet gas. Despite a reduction of reservoir pressure due to production a wet gas remains a gas, no liquid forms within the reservoir.

              Dry Gas

Natural gas that occurs in the absence of any type of liquid or condensate hydrocarbons, including gas that has condensable hydrocarbons. There is no liquid formed in the reservoir or at the surface, the mixture is solely gas.

Hydrocarbon Fluid Types.png

Hydrocarbon Fluid List


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