What are the three types of natural gas reservoirs?

What are the three types of natural gas reservoirs?

• A. Wet Gas, Dry Gas, Natural Gas Liquids
• B. Dry Gas, Wet Gas, Associated Gas
• C. Gas Condensate (Retrograde Condensate), Wet Gas, Dry Gas
• D. Gas Condensate, Dry Gas, Associated Gas

Answer: (C)

In natural gas reservoirs, how the hydrocarbon mixture behaves with pressure defines the reservoir type: dry gas, wet gas, or gas condensate (retrograde condensate). A dry gas reservoir contains mainly methane and the gas stays in the gas phase under reservoir conditions, with little or no liquid hydrocarbon produced. A wet gas reservoir has significant heavier hydrocarbons in the gas, so there are condensable components present that may appear as liquids under certain conditions, leading to natural gas liquids being recovered. A gas condensate reservoir is characterized by liquids condensing out of the gas as pressure falls below the dew point, creating a separate condensate liquid phase inside the reservoir (retrograde condensate) that is produced along with the gas. That trio—dry gas, wet gas, and gas condensate (retrograde condensate)—is the standard classification for natural gas reservoirs.

In natural gas reservoirs, how the hydrocarbon mixture behaves with pressure defines the reservoir type: dry gas, wet gas, or gas condensate (retrograde condensate). A dry gas reservoir contains mainly methane and the gas stays in the gas phase under reservoir conditions, with little or no liquid hydrocarbon produced. A wet gas reservoir has significant heavier hydrocarbons in the gas, so there are condensable components present that may appear as liquids under certain conditions, leading to natural gas liquids being recovered. A gas condensate reservoir is characterized by liquids condensing out of the gas as pressure falls below the dew point, creating a separate condensate liquid phase inside the reservoir (retrograde condensate) that is produced along with the gas.

That trio—dry gas, wet gas, and gas condensate (retrograde condensate)—is the standard classification for natural gas reservoirs.