Geochemical Characteristics and Origin of Natural Gas and Condensate in the Central Zone of Zengmu Basin

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  • 1.Key Laboratory of Oil and Gas Resources and Exploration Technology of Ministry of Education,
    Yangtze University, Wuhan 430100, China; 2.Hubei Geological Survey, Wuhan 430100, China;
    3.No.267 Exploration Team, Geological Bureau of Jiangxi Nuclear Industry, Jiujiang 332000, China

Received date: 2013-01-30

  Revised date: 2013-05-16

  Online published: 2013-12-10

Abstract

Based on the collection of a great number of data,according to the chemical composition and carbon isotope composition of 10 natural gas samples from the central zone of Zengmu Basin,the geochemical characteristics and origin of natural gas in this area were analyzed systematically.At the same time,the biomarker features of condensate oil associated with gas were analyzed,and its oil source was discussed.Research shows that,the alkane gases in the central zone of the basin are mainly composed of methane,and the dryness coefficient ranges from 0.68 to 0.97,indicating the existence of both dry and wet gases.Carbon isotope values have positive sequence among the C1-C3 alkanes.δ13C1 varies from -45.6‰ to -31.5‰,δ13C2 varies from -32.7‰ to -24‰,and δ13C3 varies from -30.1‰ to -23.4‰.All these indicate that the hydrocarbon gases are of biogenic origin and belong to the primary kerogen cracking gas.while the non-hydrocarbon gas are mainly composed of CO2 and N2 and δ13CCO2 varies from -10.8‰ to -2.4‰,which shows that CO2 is of abiogenic origin condensate oil associated with natural gas have high Pr/Ph ratio,high content of oleanane and bicadinane,which have the genetic relationship with coal-measure source rocks.

Cite this article

WANG Deng,XU Yao-hui,WEN Zhi-gang,HU Ming-yi,HU Zheng-xiang,ZHOU Shi-qing,LI Chen . Geochemical Characteristics and Origin of Natural Gas and Condensate in the Central Zone of Zengmu Basin[J]. Natural Gas Geoscience, 2013 , 24(6) : 1205 -1213 . DOI: 10.11764/j.issn.1672-1926.2013.06.1205

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