Hydrocarbon Reservoirs can be classified in terms of how the fluid present changes due to change in pressure and temperature as it is brought out to the surface.
- Dry Gas Reservoir: The fluid present in the reservoir is in gaseous form and it remains in gaseous form as it is brought out to the surface.
- Retrograde-Condensate Gas Reservoir: The fluid present in the reservoir is in gaseous form. However, part of it condenses into liquid form either in the reservoir itself or on it's way to the surface. What is produced is primarily gas with smaller quantities of liquid hydrocarbon.
- Wet Gas Reservoir: The fluid present in the reservoir is primarily gas, but contains small amount of liquid. When produced, gas is produced along with small amount of liquid.
- Volatile Oil Reservoir: The fluid present in the reservoir is very light oil. Gas forms as it is brought to the surface. If produced oil is kept in an open container, it evaporates away.
- Black Oil Reservoir: The fluid present in the reservoir is heavier oil. Some dissolved gas might be present. However, the produced oil is "dead", i.e., does not evaporates away if kept in an open container.
Sources:
- http://www.informit.com/articles/article.aspx?p=2241145&seqNum=4
- http://petrowiki.org/Natural_gas_properties
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