portion of known demonstrated reserves (see above) that actually can be extracted from the earth and delivered to market with today's mining techniques (in the U.S., about 267 billion tons -- or 13% of known American reserves)
Mineral, oil and natural gas reserves situated in places capable of being produced.
That part of the hydrocarbon volumes in a reservoir that can be economically produced.
See oil in place
That part of oil in place which can be economically extracted.
The proportion of hydrocarbons that can be recovered from a reservoir using existing techniques.
That proportion of the oil and/or gas in a reservoir that can be removed using currently available techniques.
Oil or gas that it is anticipated can be produced. Technical Reserves are theoretically producible at a gross operating margin by e.g. normal primary or secondary recovery methods, while Commercial Reserves are restricted to volumes recoverable at an acceptable profitability. The detailed definitions are important in oil and gas financial and other information.