|  Definitions, Sources and Explanatory Notes |
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|  Category:   | Natural Gas Exploration & Reserves        |
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|  Topic:      | Natural Gas Plant Liquids Proved Reserves |
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|   Definitions |  |
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| Key Terms                    | Definition                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| Natural Gas Liquids          | Those hydrocarbons in natural gas which are separated from the gas through the processesof absorption, condensation, adsorption, or other methods in gas processing or cyclingplants. Generally such liquids consist of propane and heavier hydrocarbons and are commonly referred to as condensate, natural gasoline, or liquefied petroleum gases.Where hydrocarbon components lighter than propane are recovered as liquids, thesecomponents are included with natural gas liquids.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Natural Gas Processing Plant | A facility designed to recover natural gas liquids from a stream of naturalgas which may or may not have passed through lease separators and/or field separation facilities.Another function of the facility is to control the quality of the processed natural gas stream. Cyclingplants are considered natural gas processing plants.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Plant Liquids                | Those volumes of natural gas liquids recovered in natural gas processing plants.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Proved Reserves              | Proved reserves of natural gas as of December 31 of the report year are the estimatedquantities which analysis of geological and engineering data demonstrate with reasonablecertainty to be recoverable in future years from known reservoirs under existingeconomic and operating conditions.Reservoirs are considered proved if economic producibility is supported by actual productionor conclusive formation test (drill stem or wire line), or if economic producibility issupported by core analyses and/or electric or other log interpretations.The area of a gas reservoir considered proved includes: (1) that portion delineated bydrilling and defined by gas -- oil and/or gas -- water contacts, if any; and (2) theimmediately adjoining portions not yet drilled, but which can be reasonably judged aseconomically productive on the basis of available geological and engineering data. In theabsence of information on fluid contacts, the lowest known structural occurrence of hydrocarbons is considered to be the lower proved limit of the reservoir.Volumes of natural gas placed in underground storage are not to be considered proved reserves.For natural gas, wet after lease seperation, an appropriate reduction in the reservoir gasvolume has been made to cover the removal of the liquefiable portions of the gas in lease and/orfield separation facilities and the exclusion of nonhydrocarbon gases where they occur insufficient quantity to reder the gas unmarketable.For dry natural gas, an appropriate reduction in the gas volume has been made to cover theremoval of the liquefiable portions of the gas in lease and/or field separation facilities,and in natural gas processing plants, and the exclusion of nonhydrocarbon gases where theyoccur in sufficient quantity to render the gas unmarketable.It is not necessary that production, gathering, or transportation facilities be installed oroperative for a reservoir to be considered proved. It is to be assumed that compressionwill be initiated if and when economically justified. |
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| For definitions of related energy terms, refer to the   EIA Energy Glossary. |
|  	Sources |
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|  | Form EIA-23L, "Annual Report of Domestic Oil and Gas Reserves (County Level Version)".  Form EIA-64A, "Annual Report of the Origin of Natural Gas Liquids Production"    Natural Gas Survey Forms and Instructions
 	Explanatory Notes
  Related data and background information are published in the      U.S. Crude Oil and Natural Gas Proved Reserves Annual Report. |