ABSTRACT
Dry gas reservoirs types of reservoirs contain hydrocarbon in a single gas phase at initial pressure and temperature condition in subsurface, and remain in the gaseous phase on production when pressure and temperature decline. Wet gas reservoirs types of reservoirs contain hydrocarbon in single gas phase at initial pressure and temperature condition in subsurface. Gas condensate reservoirs types of gas reservoirs contain gas in single phases at reservoir pressure and temperature condition. The reduction in pressure when oil is produced from a reservoir often results in dissolved gas being emitted from oil as free gas. The occurrences of mercury in traces originate from volcanic rocks, often underlying the gas reservoirs. The quality of reservoir fluid may also be affected due to the presence of mercury in gas. Reservoir pressure plays an important role in determining numerical simulations where knowledge of pressure variation with time is required to understand the future filed performance and pressure maintenance strategies.
