Geochemical Characteristics of Natural Gas in OverpressuredLarge Gas Field of Kelasu Tectonic Belt in Kuqa Depression
Received date: 2012-09-16
Revised date: 2013-03-21
Online published: 2013-08-10
The geochemical characteristics of natural gas play an important part in the research of accumulation mechanism.The characteristics of gas component and its carbon isotope in Kelasu tectonic zone were discussed,and the maturity of the natural gas was analyzed.It is indicated that natural gas in this large gas field is dominated by hydrocarbon,and the content of methane accounts for more than 90%.The dryness coefficient is over 97%,which indicates the natural gas is dry gas.The value of δ13C1 is from -33.1‰ to -25.1‰,and the main distribution interval is from -32‰ to -28‰.The value of δ13C2 is from -28.1‰ to -16.81‰,and the main distribution interval is -20‰ to -18‰.In general,natural gas in the overpressured large gas field from Kelasu tectonic zone is typical dry gas with high carbon isotope of methane and ethane.Our research result has important designative meaning for accumulation of overpressure large gas field.
Key words: Large gas field; Overpressure; Geochemistry; Kelasu tectonic belt
FENG Song-bao,WANG Hong-zhi
.
Geochemical Characteristics of Natural Gas in OverpressuredLarge Gas Field of Kelasu Tectonic Belt in Kuqa Depression[J]. Natural Gas Geoscience, 2013
, 24(4)
: 784
-789
.
DOI: 10.11764/j.issn.1672-1926.2013.04.784
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