Part of total Hydrocarbon In Place (HCIP) in petroleum reservoir which can be recovered to the surface under specific FDP. 

It comprises Oil Reserves (OR), also called Recoverable Oil, and Gas Reserves (GR), also called Recoverable Gas.

The volumetric value of HCR in NTP conditions is given by STHCR.

The percentage which recoverable reserves STHCR constitute of the total Surface Tank Hydrocarbon Initial In Place (STHCIIP) is called Recovery Factor.

Unlike STHCIIP, which is purely geological concept, the STHCR and corresponding RF depend on the parameters of FDP based on reserves complexity, recovery method, recovery duration and economics. 

There are different ways of classifying hydrocarbon reserves based on their volume and structure.

See Also

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology /  Petroleum Reservoir 

[ Exploration ][ Booking Reserves ] [ Reserves Classification ] 

[ Oil Reserves (OR) ] [ Gas Reserves (GR) ]