A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Natural Gas - A mixture of hydrocarbon compounds and small quantities of various nonhydrocarbons existing in the gaseous phase or in solution with crude oil in natural underground reservoirs at reservoir conditions. The principal hydrocarbons usually contained in the mixture are methane, ethane, propane, butanes, and pentanes. Typical nonhydrocarbon bases that may be present in reservoir natural gas are carbon dioxide, helium, hydrogen sulfide, and nitrogen. Under reservoir conditions, natural gas and the liquefiable portions thereof occur either in a single gaseous phase in the reservoir or in solution with crude oil and are not distinguishable at that time as separate substances. Natural Gas, based on the type of occurrence in the reservoir, is classified by two categories, as follows: Non-Associated Gas natural gas that is not in contact with significant quantities of crude oil in the reservoir. Associated/Dissolved Gas is the combined volume of natural gas that occurs in crude oil reservoirs either as free gas (associated) or as gas in solution with crude oil (dissolved). Associated gas is free natural gas, commonly known as gas cap gas, which overlies and is in contact with crude oil in the reservoir. Dissolved gas is natural gas that is in solution with crude oil in the reservoir at reservoir conditions. Statistical data pertaining to natural gas production and reserves are reported in units of 1,000,000 cubic feet (i.e., MMCF) at 14.73 pounds per square inch absolute and 60 degrees Fahrenheit for FRS purposes.

Natural Gas Liquids (NGL) - Natural gas liquids are those portions of reservoir gas which are liquefied at the surface in lease separators, field facilities, or gas processing plants. Natural gas liquids include but are not limited to the following: ethane, propane, butanes, pentanes, natural gasoline, and condensate.

Net Investment in Place - The sum of net property, plant, and equipment (PP&E) plus investment and advances to unconsolidated affiliates.

Non-branded Product - Any refined petroleum product that is not a branded product.

NOx - Nitrogen oxides or oxides of nitrogen that are a chief component of air pollution produced by fossil fuel burning.

Nuclear Fuel Operations - All nuclear fuel operations, excluding reactor and reactor component manufacturing or containment construction. Includes exploration and development; mining; milling; conversion; enrichment; fabrication; reprocessing; and spent fuel storage.