GEOCHEMICIAL CHARACTERISTICS OF NATURAL GAS OF XUJIAHE FORMATIONIN SOUTHERN AND MIDDLE SICHUAN

doi:10.3863/j.issn.1000-

西南石油大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (4): 27-30.DOI: 10.3863/j.issn.1000-

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GEOCHEMICIAL CHARACTERISTICS OF NATURAL GAS OF XUJIAHE FORMATIONIN SOUTHERN AND MIDDLE SICHUAN

XIAO Zhi-hua¹ XIE Zeng-ye² LI Zhi-sheng² MA Cheng-hua² SUN Qing-wu²

1.Key Laboratory for Hydrocarbon Accumulation Mechanism，Ministry of Education，China University of Petroleum，Changping Beijing 102249，China；2.Langfang Branch Institute of CNPC Oil Exploration and Development Research Institute，Langfang Hebei 065007，china

Received:1900-01-01 Revised:1900-01-01 Online:2008-08-20 Published:2008-08-20

Abstract

Abstract:

In view of the natural gas of Xujiahe Formation in southern and middle Sichuan Basin，it is concluded that the proportion of CH₄ is about 80%-96% in component of hydrocarbon，that of C₂^＋ is about 3%-18%，the ratio of C₁/（C_1-5） is less than 0.95，It is a typical wet gas and belongs to thermal degradation gas of kerogen.The gas isotope composition of δ¹³C₁ ranges from 43‰ to 37‰，while that of δ¹³C₂ from30‰ to 24‰，δD_CH4ranges from 190‰ to 150‰，δD_C2H6 from 150‰ to 110‰.There is an fairly well positive correlation between δ¹³C₁ and the absolute concentration of methane.The carbon isotope value of natural gas of Xujiahe Formation is obviously lighter than that of natural gas in the marine facies strata，it is of the coal related gas feature，which shows that the natural gas comes from Upper Triassic coalbed source rocks.

Key words: Xujiahe Formation, natural gas, isotope, geochemical characteristics, Sichuan Basin

CLC Number:

TE122.1

XIAO Zhi-hua XIE Zeng-ye LI Zhi-sheng MA Cheng-hua SUN Qing-wu . GEOCHEMICIAL CHARACTERISTICS OF NATURAL GAS OF XUJIAHE FORMATIONIN SOUTHERN AND MIDDLE SICHUAN [J]. 西南石油大学学报(自然科学版), 2008, 29(4): 27-30.

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GEOCHEMICIAL CHARACTERISTICS OF NATURAL GAS OF XUJIAHE FORMATIONIN SOUTHERN AND MIDDLE SICHUAN

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