Proved Oil and Gas Reserves -- Those quantities of crude oil and gas, which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible -- from a given date forward, from known reservoirs, and under existing economic conditions, operating methods and government regulations -- prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time. This definition has been abbreviated from the definition of "Proved oil and gas reserves" contained in Rule 4-10(a)(22) of SEC Regulation S-X.Proved Developed Reserves -- Reserves are categorized as proved developed if they are expected to be recovered from existing wells. Probable Reserves -- Those additional reserves that are less certain to be recovered than proved reserves but more certain to be recovered than possible reserves. This definition has been abbreviated from the applicable definition contained in Rule 4-10(a)(18) of SEC Regulation S-X. Possible Reserves -- Those additional reserves that are less certain to be recovered than probable reserves. This definition has been abbreviated from the applicable definition contained in Rule 4-10(a)(17) of Regulation S-X. Barrel – unit of measure for oil and petroleum products, equivalent to 42 U.S. gallons. BOE – barrels of oil equivalent, used to equate natural gas volumes to liquid barrels at a general conversion rate of 6,000 cubic feet of gas per barrel. BOE/d – barrels of oil equivalent per day. Field – an area consisting of a single reservoir or multiple reservoirs all grouped on, or related to, the same individual geological structural feature or stratigraphic condition. The field name refers to the surface area, although it may refer to both the surface and the underground productive formations. MBBL – thousand barrels of oil. MBOE – thousand barrels of oil equivalent. CF – thousand cubic feet of gas. MMBOE – million barrels of oil equivalent. MMBTU – million British thermal units. MMCF – million cubic feet of gas. PV10 – the estimated present value of the resource, discounted at a 10 percent annual rate.
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