“…Calculations of production engineering, field performance analysis, reservoir studies, design of production facility and planning for future improved oil recovery projects require accurate knowledge of reservoir fluid pressure, volume, and temperature (PVT) properties Dindoruk and Christman, 2004;Malallah et al, 2006;Valk o and McCain, 2003). Initial gas solubility in reservoir oil is one of these PVT properties which is defined as the amount of dissolved gas in one stock-tank barrel of oil (Kartoatmodjo and Schmidt, 1994;Standing, 1947).…”