The Isotope Geochemistry of N<sub>2</sub> in Natural Gas Pools

The Isotope Geochemistry of N₂ in Natural Gas Pools

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摘要

摘要: The isotopic compositions of N₂ (δ 15N,‰,ATM) imply the geochemical origins of molecular nitrogen in gas pools . N₂ with -19‰≤δ¹⁵N_N₂≤-10‰ may be from immature sedimentar y organic matter.-10‰<δ¹⁵N_N₂≤-2‰ may indicate the N₂ origina tes from mature (including high mature) sedimentary organic matter.-2‰<δ¹⁵ N_N₂<+1‰ implies the N₂ may be from the deep crust or mantle. N₂ with δ¹⁵N_N₂=0‰ and N₂/Ar=38～84 suggests to come from the atm osphere.-1‰≤δ¹⁵N_N₂<+4‰ characterizes N₂ from ammonium clay m inerals in shale and mudrock during metamorphism.δ¹⁵N_N₂=+4‰ is t he typical feature of N₂ from saltpeter in evaporite.+4‰<δ¹⁵N_N₂ ≤+18‰ indicates N₂ may derive from post-mature sedimentary organic matter, which is the main source of N₂-high gas (N₂＞60%) pools.N₂-high gas pools,which occurs in a large scale in peroliferous basin, suggests that it is mainly the post-mature gas trapped in the reservoir. N₂ with δ¹⁵N_N₂ varying from -10‰ to -2‰ is the main source of N₂-rich gas (N₂>15%) pool s,and with δ¹⁵N_N₂ varying from +1‰ to +4‰ may form either the N 2-high or the N₂-rich gas pools.
- nitrogen isotope /
- origin of nitrogen /
- natural gas /
- ammomia /
- sedimentary organic matter

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参考文献(32)

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