Geochemical Characteristics of Abiogenic Gas and Its Percentage in Xujiaweizi Fault Depression, <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Songliao Basin</st1:City>, <st1:State w:st="on">NE</st1:State> <st1:country-region w:st="on">China</st1:country-region></st1:place><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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Geochemical Characteristics of Abiogenic Gas and Its Percentage in Xujiaweizi Fault Depression, Songliao Basin, NE China

详细信息

责任者：Ni Yunyan (PetroChina Research Institute of Petroleum Exploration & Development ; Beijing 100083 ; China) ; Dai Jinxing
刊名：Petroleum Exploration and Development
出版年：2009
卷期：36(1)
关键词：无机成因气 ; abiogenic gases ; 松辽平原 ; Songliao Plain
页码：p.35-45
图表：5 illus., 7 tables, 48 refs.
分类号：1003
issnNo：ISSN1000-0747
isbnNo：CN11-2360/TE

摘要

Gases with different origins occur in the Xujiaweizi Fault Depression. Among them, the abiogenic gases have a typical carbon isotopic reversal trend (hansi-font-family: ’Times New Roman’">δ¹³C₁>hansi-font-family: ’Times New Roman’">δ¹³C₂>hansi-font-family: ’Times New Roman’">δ¹³C₃>hansi-font-family: ’Times New Roman’">δ¹³C₄), the carbon isotope of methane is greater than-30hansi-font-family: ’Times New Roman’">‰, and the R/Ra greater than 0.5. Thus it is argued that the abiogenic gases in the Xujiaweizi Fault Depression can not simply be a result of two-source mixing. The mixing of coal-derived and oil-derived gases can not lead to the carbon isotopic reversal trend, which provides further evidence for the abiogenic origin of the deep-layer gas.