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Reserve Definitions and Classifications (Reserve definitions approved by the Board of Directors, SPE, Inc. Feb. 27, 1987.) Reserves Reserves are estimated volumes of crude oil, condensate, natural gas, natural gas liquids, and associated substances anticipated to be commercially recoverable from kn...

Society of Petroleum Engineers In 1987 the Society of Petroleum Engineers (SPE) promulgated definitions for proved, probable, and possible reserves of crude oil, condensate, natural gas, natural gas liquids, and "associated substances." Associated substances include sulfur, helium, and ca...

In the context of oil and gas, preferred terminology for resources and reserves is illustrated by Figure 1 , which is adapted from a comparable figure used by the Energy Information Administration of the United States Department of Energy (USDOE/EIA). [align=center] http://fanarco.net/images/reserv...

The McKelvey Box The basis for current terminology for the classification of reserves and resources of all minerals, including oil and gas, is based on work by McKelvey (1972), a former director of the United States Geological Survey (USGS). As shown by Table 2 , which illustrates what has been cal...

Lahee’s Classification Among the earliest classifications of reserves were those advocated by Lahee at the 1944 meeting of the American Petroleum Institute (API) and in 1955 at the World Petroleum Congress. As shown in Table 1 , Lahee’s 1955 system classified reserves as proved, probable, possible,...

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Classifications of Reserves Background Over the years, there have been numerous classifications of oil and gas reserves advocated by various individuals and organizations. The principal purposes of aclassification system are to (1) promote uniformity and (2) identify the degree of risk for each cla...

Solution Gas Solution gas, also (incorrectly) called casinghead gas,* is natural gas that is dissolved in reservoir oil under reservoir conditions of pressure and temperature and is liberated from solution by reduction in pressure and temperature as the oil is produced through surface gas-oil separ...

Natural Gas Natural gas is the portion of petroleum that exists either in the gaseous phase, or in solution in crude oil, in natural underground reservoirs, and is gaseous at atmospheric pressure and temperature. Natural gas may include amounts of nonhydrocarbons. Natural gas may be subclassified a...

Petroleum Petroleum is a general term that applies to all naturally occurring mixtures that consist predominantly of hydrocarbons. Petroleum includes natural gas, crude oil, and natural bitumen. (The reserve estimation techniques discussed here do not consider natural bitumen.) Crude Oil Crude oil ...

Operating Environment The operating environment of an oil and gas property is one of the major factors controlling the costs of developing and operating the property. These costs, and the market price of the production, have a direct impact on the minimal size of a commercially exploitable accumula...

In reservoirs with improved recovery projects, this list should be expanded to include surveillance of monthly injected volumes and pressures from each injection well. Data requirements for improved recovery projects tend to be method and project specific. Talash (1988) has discussed data requireme...