mdñksfgsfmg

Deposits
Oil reserves are the amount of technically and economically recoverable oil.
Reserves may be for a well, for a reservoir, for a field, for a nation, or for the world.
Differentclassifications of reserves are related to their degree of certainty.
The total estimated amount of oil in an oil reservoir, including both producible and
Non-producible oil , is called oil in place.However, because of reservoir characteristics and
Limitations in petroleum extraction technologies, only a fraction of this oil can be brought to
The surface, and it is only this producible fractionthat is considered to be reserves.
The ratio of producible oil reserves to total oil in place for a given field is often referred to as
The recovery factor. Recovery factors vary greatly among oilfields. The recovery factor of any
Particular field may change over time based on operating history and in response to changes
In technology and economics. The recovery factor may also rise overtime if additional
Investment is made in enhanced oil recovery techniques such as gas injection. Surfactants
Injection, water-flooding, or microbial enhanced oil recovery.
Many oil-producingnations do not reveal their reservoir engineering field data and instead
Provide unaudited claims for their oil reserves. The numbers disclosed by some national
Governments are suspected of beingmanipulated for political reasons.
All reserve estimates involve uncertainty, depending on the amount of reliable geologic
And engineering data available and the interpretation of those data. The relativedegree
Of uncertainty can be expressed by dividing reserves into two principal classifications
“Proven” (or “proved”) and “un proven” (or “unproved”). Unproven reserves can further
Be dividedinto two subcategories “probable” and “possible” to indicate the relative degree
Of uncertainty about their existence. The most commonly accepted definition of these are
Based on those approved...