Discussion on the recognition of gas origin by using ethane carbon isotope

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  • CNOOC Research Institue,Beijing 100028,China

Received date: 2015-07-23

  Revised date: 2015-12-17

  Online published: 2019-09-20

Abstract

Carbon isotope composition of ethane has been considered as a very useful index for discrimination of natural gas genetic type,due to the following aspects.(1)Humic organic matters are much more enriched in 13C than sapropelic source rock,so its carbon isotope is heavier than of that of sapropelic matter;(2)Maturity has little influence on carbon isotope composition of ethane,so it inherits the carbon isotope characteristics of its parent source.However,some research results showed that some sapropelic organic matters have abnormal heavy carbon isotopic composition,and ethane carbon isotopic composition of gases from this type is similar as gases from humic type.Meanwhile,maturity does have distinct influence on carbon isotope of ethane.Low-mature stage gas is generally enriched in 12C whether it originated from humic or sapropelic source rock,and has a similarcarbon isotopic character of gas from oil-type gases.As a consequence,factors of the deposition environment of source rocks,the original carbon isotope composition of its organic matter and the maturity of the natural gases should be considered comprehensively in applying carbon isotopic composition of ethane to distinguish the genetic type of nature gas.

Cite this article

Li You-chuan, Sun Yu-mei, Lan Lei . Discussion on the recognition of gas origin by using ethane carbon isotope[J]. Natural Gas Geoscience, 2016 , 27(4) : 654 -664 . DOI: 10.11764/j.issn.1672-1926.2016.04.0654

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