Geochemical characteristics of the natural gas from the Xujiahe Formation in the central Sichuan Basin,China
Received date: 2016-10-29
Revised date: 2017-02-28
Online published: 2017-04-10
In order to investigate the characteristics,genesis and origin of the natural gas of the Xujiahe Formation in the central Sichuan Basin,we analyzed the geochemical compositions and carbon and hydrogen isotopes of gas samples from Guang’an Gasfield and made comparison with surrounding areas.The natural gas is mainly composed of methane.It is characterized by wet gas with a dryness coefficient generally lower than 0.95,except at Yuanba-Tongnanba area.The dryness coefficient is mainly controlled by the maturity of source rocks.The δ13C1 values range from -43.8‰ to -29.3‰,δ13C2 values range from -35.4‰ to -24.3‰,and δDCH4 values range from -179‰ to -152‰.The identification of gas origin and gas-source correlation indicate that the natural gas of the Xujiahe Formation in most gas fields is mainly derived from coal-measure source rocks in the Xujiahe Formation.At most areas,partial reversal of the carbon isotope series(δ13C3>δ13C4) is found in only a few gas samples,which is ascribed for the mixing of gas from the same source but different stages.
Zhai Li-na,Ni Yun-yan,Wu Chao-dong,Gao Jin-liang . Geochemical characteristics of the natural gas from the Xujiahe Formation in the central Sichuan Basin,China[J]. Natural Gas Geoscience, 2017 , 28(4) : 539 -549 . DOI: 10.11764/j.issn.1672-1926.2017.02.016
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