PRELIMINARY APPROACH OF CARBON ISOTOPE DATA OF COAL-FORMED GAS IN NORTH CHINA

Zhou Xingtai

doi:10.11743/ogg19860309

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PRELIMINARY APPROACH OF CARBON ISOTOPE DATA OF COAL-FORMED GAS IN NORTH CHINA
Vol. 7, Issue 3, Pages: 256-260(1986)
Online First：25 September 1986，

Published：1986
DOI： 10.11743/ogg19860309
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DOI：

Zhou Xingtai. PRELIMINARY APPROACH OF CARBON ISOTOPE DATA OF COAL-FORMED GAS IN NORTH CHINA[J]. 1986, 7(3): 256-260. DOI： 10.11743/ogg19860309.

摘要

在利用δ

C 值判断天然气的成因类型时

必须考虑具体地质情况。华北地区的天然气:若δ

值小于-55‰

既可能是生物气

也可能是煤田气;若δ

值在-35‰至-45‰之间

则属沙河街组生成的气的可能性较大;若δ

值大于-40‰

则有属石炭二叠纪煤系气的可能。

Abstract

A preliminary approach is made on the genetic types of the gases in North China based on the carbon isotope data and geological data.It is suggested that natural gas with δ

C-value less than -55‰ is generally biogenic gas or gasgenerated from coal seam;the one with δ

C-value ranging from -35‰ to 45‰is generally derived from humic-saproplic kerogens of the Tertiary;while theone whose δ

C-value is greater than -40‰ is mainly generated from coal mea-sures(including coal seams and carbonaceous shales)of the Permo-Carboni-ferous.