Isotopic Geochemistry of Nonhydrocarbons in Natural Gas from Sanshui Basin, Guangdong

Du Jianguo; Liu Wenhui; Song Minliang

Based on geochemical characteristics of stable helium, argon, carbon and nitrogen isotopes for natural gas, origins of nonhydrocarbons and fluids are discussed. ³He/⁴He ratios in natural gas are 1.14-4.54 times as much as that in the air. Stable isotope compositions of argon of natural gas are rich in ⁴⁰Ar (⁴⁰Ar/ ³⁶Ar=450-841).Carbon isotope compositions (δ¹³CPDB) of carbon dioxide vary from-20‰ to -2‰.The δ¹⁵ Nvalues of natural gases range between -57.7‰ and 95.1‰.The values (Q) of heat fluid in the Sanshui Basin calculated depend on ²He ³He ratios, change from 72 mWm ²to 82 mWm^-2.The high values of heat fluid and isotopic ratios of He. Ar. C and N have a relation to ancient volcanos. The geochemical qualities of stable isotopes of He, Ar, C and N in natural gases indicate that there are strong deep (matter and heat) fluids in the Sanshui basin.Part of He, Ar and N in some reservoirs came from the mantle. Nonhydrocarbons originated from the crust are mixed in various kinds of natural gases. Carbon dioxide in natural gases is mainly originated from the crust, CO₂ depleted in ¹³C is mainly originated from degradation of organic matter in strata; but CO₂ enriched in ¹³C are from reaction between carbonate rocks and under ground water and thermal fluids, and mixed in CO₂ from the deep earth. An amount of heat fluid was derived from the upper mantle.

Isotopic Geochemistry of Nonhydrocarbons in Natural Gas from Sanshui Basin, Guangdong

Lanzhou Institute of Geology. Chinese Academy of Seiences

Received Date: 1989-10-12

Publish Date: 1991-03-10

Abstract: Based on geochemical characteristics of stable helium, argon, carbon and nitrogen isotopes for natural gas, origins of nonhydrocarbons and fluids are discussed. ³He/⁴He ratios in natural gas are 1.14-4.54 times as much as that in the air. Stable isotope compositions of argon of natural gas are rich in ⁴⁰Ar (⁴⁰Ar/ ³⁶Ar=450-841).Carbon isotope compositions (δ¹³CPDB) of carbon dioxide vary from-20‰ to -2‰.The δ¹⁵ Nvalues of natural gases range between -57.7‰ and 95.1‰.The values (Q) of heat fluid in the Sanshui Basin calculated depend on ²He ³He ratios, change from 72 mWm ²to 82 mWm^-2.The high values of heat fluid and isotopic ratios of He. Ar. C and N have a relation to ancient volcanos. The geochemical qualities of stable isotopes of He, Ar, C and N in natural gases indicate that there are strong deep (matter and heat) fluids in the Sanshui basin.Part of He, Ar and N in some reservoirs came from the mantle. Nonhydrocarbons originated from the crust are mixed in various kinds of natural gases. Carbon dioxide in natural gases is mainly originated from the crust, CO₂ depleted in ¹³C is mainly originated from degradation of organic matter in strata; but CO₂ enriched in ¹³C are from reaction between carbonate rocks and under ground water and thermal fluids, and mixed in CO₂ from the deep earth. An amount of heat fluid was derived from the upper mantle.

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Isotopic Geochemistry of Nonhydrocarbons in Natural Gas from Sanshui Basin, Guangdong

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