Received date: 2005-01-01
Revised date: 2005-12-12
Online published: 2006-02-20
Molecular nitrogen encountered in varying amounts(up to >90%) in natural gas reservoirs may be derived from two potential sources,thermal liberation from the organic and/or inorganic constituents of sediments(crustal source) and accumulation of upward migrating deep (mantle) nitrogen.Different types of pyrolysis experiments show that nitrogen is produced not only at low temperatures,but also at high temperature levels.A variety of different release mechanisms are involved.It is well known that proteins areare hydrolysed to amino acids during the early, diagenetic stage of maturat ion (Ro<0.6 %). However, amino acids are generally unstable and are prefer entially transformed to NH3 under the catalysis of clay minerals which then may be further oxidized to N2, nitrate or nitrite. The bulk of nitrogen in coals at higher ranks occurs in condensed aromatic units as pyridinic and pyrrolic structures of high thermal stability.Natural gases from different depositional environments are characterized by nitr ogen isotope ratios. The =δ15N values are usually lower than +3‰ in continental deposits whereas they are higher +4‰ in marine deposits. Different ni trogen isotope compositions are indicative for specific origins. Generally δ15N vaues of biogenic nitrogen are below -10‰whereas for nitrogen from pyro lysis experiments δ15N values are higher than -10‰. The N2/Ar of gases produced by microbial processes and thermal pyrolysis is often higher than 84. The δ15N of N2 resulting from high temperature metamorphism of N-conta ining minerals ranges from +1.0‰ to +3.5‰, with N2/Ar＞84. The δ15N composition of nitrogen from the upper mantle and/or the deep crust is between -2 0‰ and +1‰，with 40Ar/36Ar＞2000 and 3He/4He＞1.39×10-6.
Key words： Natural gas; Nitrogen; Isotopic composition; Pyrolysis.
LIU Quan-you;Liu Wen-hui;Krooss B M;WANG Wan-chun;DAI Jin-xing . ADVANCES IN NITROGEN GEOCHEMISTRY OF NATURAL GAS[J]. Natural Gas Geoscience, 2006 , 17(1) : 119 -124 . DOI: 10.11764/j.issn.1672-1926.2006.01.119
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