摘要
在利用δC 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δC值小于-55‰,既可能是生物气,也可能是煤田气;若δC值在-35‰至-45‰之间,则属沙河街组生成的气的可能性较大;若δC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 δC-value less than -55‰ is generally biogenic gas or gasgenerated from coal seam;the one with δC-value ranging from -35‰ to 45‰is generally derived from humic-saproplic kerogens of the Tertiary;while theone whose δC-value is greater than -40‰ is mainly generated from coal mea-sures(including coal seams and carbonaceous shales)of the Permo-Carboni-ferous.
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