Influence of Water Saturation on Generation of CO2 and Its Carbon Isotope Fractionation from Limestone Pyrolysis
Received date: 2009-07-10
Revised date: 2009-08-29
Online published: 2010-02-10
A pre -Tertiary limestone sampled from the Qiongdongnan basin,South China Sea,was pyrolyzed under conditions of different water saturations to compare their differences in carbon dioxide generation and carbon isotope fractionation. The result shows that the presence of water and its amount significantly affect the generation of thermogenic carbon dioxide. Water not only improves carbon dioxide formation,but also reduces the temperature of limestone decomposition. With comparison of no water in pyrolysis,water causes the isotopically lighter carbon of CO2 from limestone decomposition. Combined with the previous pyrolysis results of calcareous shales and the geological and geochemical data of Yinggehai basin,these suggest that the inorganic carbon dioxide would mainly originate from the lower Miocene calcareous shales and the contribution of pre -Tertiary limestone was less important.
Key words： Yinggehai basin; Limestone; Pyrolysis water; Carbon dioxide.
YANG Li-Guo, TIAN Hui, SHEN Jia-Gui, XIAO Xian-Ming, HUANG Bao-Jia . Influence of Water Saturation on Generation of CO2 and Its Carbon Isotope Fractionation from Limestone Pyrolysis[J]. Natural Gas Geoscience, 2010 , 21(1) : 139 -143 . DOI: 10.11764/j.issn.1672-1926.2010.01.139
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