Comparison of Geochemical Characteristics of Carboniferous andPermian-Triassic Natural Gas in Northeast Shichuan
Received date: 2008-11-06
Revised date: 2008-11-30
Online published: 2008-12-10
This paper studies the geochemical characteristics of natural gas in Carboniferous Huanglong Formation and Permian Chanxing Formation-Triassic Feixianguang Formation in the area of Northeast Sichuan. The results show that the natural gas belongs to high\|mature dry gas, C2+ content is low，and the natural gas in Permian Chanxing Formation-Triassic Feixianguang Formation is drier than that in Carboniferous Huanglong Formation. The content of non-hydrocarbon gas of Permian Chanxing Formatio |Triassic Feixianguang Formation is relatively high ranging 0.1%~77.8% and characterized by high H2S and CO2 contents, but the non-hydrocarbon gas of Carboniferous Huanglong Formation is relatively low and the H2S content is 0.01%~4.8%, most below 0.5%. The distributing characteristics of heavy hydrocarbons (C4—C12) are also obviously different. The carbon stable isotope compositions of CH4 and C2H6 in Permian Chanxing Formation-Triassic Feixianguang Formation are heavier than in Carboniferous Huanglong Formation, and they are distributed positively in Permian Chanxing Formation Triassic Feixianguang Formation and reversely in Carboniferous Huanglong Formation.
CHEN Jian-fa;TANG You-jun;XU Li-heng; LI Ling;MA Guang-yu;ZHAO Xing-qi . Comparison of Geochemical Characteristics of Carboniferous andPermian-Triassic Natural Gas in Northeast Shichuan[J]. Natural Gas Geoscience, 2008 , 19(06) : 741 -747 . DOI: 10.11764/j.issn.1672-1926.2008.06.741
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