دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

one of three naturally occurring isotopes of carbon. The half life of the C14 isotope makes it idea for determining the difference between thermogenic methane (C14 absent) and biogenic gas.

coal bed methane.

natural gas formed during the coalification process and trapped within and adsorbed to the coal.

n: gas produced from coal and used for fuel. It contains primarily hydrogen, methane, and carbon monoxide.

usually methane which is adsorbed and absorbed to the high surface area of the coal.

n: a light hydrocarbon liquid obtained by condensation of hydrocarbon vapours. It consists of varying proportions of butane, propane, pentane, and heavier fractions, with little or no methane or ethane.

the part of the hydrocarbon stream that is a vapor in the formation and condenses to a liquid after being cooled. Normally the volatile condensate has a composition of C5 to C8 and an API gravity of >40.

a range of principally Carbon-Hydrogen chain compounds with generally straight carbon chain lengths of C1 (methane) to C60+. The straight chain materials are alkanes.

n: a gas-processing plant that is capable of producing natural gas liquid products, including ethane, at very low operating temperatures.

liquid n: hydrocarbon mixture remaining after the removal of ethane and lighter hydrocarbons.

Dry Gas is a natural gas containing insufficient quantities of hydrocarbons heavier than methane to allow their commercial extraction or to require their removal in order to render the gas suitable for fuel use. (Also called Lean Gas) (SPE).

abbr: equivalents per million. EP mix abbr: ethane-propane mix.

equivalents per million. The epm is equal to the ppm divided by the equivalent weight.