The Geochemical Characteristics and Comparison of the Terrestrial Natural Gas in Sichuan Basin

WANG Peng，SHEN Zhong-min，LIU Si-bing，L Zheng-xiang，FENG Jie-rui，WANG Jun-ze

doi:10.11764/j.issn.1672-1926.2013.06.1186

Natural Gas Geoscience >

2013 , Vol. 24 >Issue 6: 1186 - 1195

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.06.1186

The Geochemical Characteristics and Comparison of the Terrestrial Natural Gas in Sichuan Basin

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1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,
Chengdu 610059,China;2.No.5 Oil Production Plant of PetroChina Changqing Oilfield Company,Xi′an 710200,China;
3.Reserch Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi′an 710021,China

Received date: 2013-04-09

Revised date: 2013-05-09

Online published: 2013-12-10

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Abstract

For the systematic understanding of the geochemical characteristics and differences of the terrestrial natural gas in Sichuan Basin,using the gas components,carbon isotopes,and light hydrocarbons,the characteristics of different strata in different parts of Sichuan Basin and its reasons were analyzed and investigated.The results show that gas geochemical characteristics differ significantly on lateral and longitudinal.On lateral,the methane content and dry coefficient in west Sichuan Basin are greater than those in central Sichuan Basin.The main natural gases in the former and the later are dry and wet gases,respectively.The main reasons of the above-mentioned diversities are the difference in formation thickness,burial depth and source rock.Great difference also exists in the longitudinal change rules of the gas composition.The rule in west Sichuan Basin is mainly affected by the maturity of source rock and the migration fractions of natural gas.However,in central Sichuan Basin,it is affected by the maturity and type of source rock.The gases are mainly mature and highly-mature gases in the study area,and only the central Sichuan Basin′s Jurassic natural gases are mainly mature gases.The maturity of gases is the highest in west Sichuan Basin,second in the Upper Triassic in central and south Sichuan Basin,and the lowest in the Jurassic in central Sichuan Basin.These results are caused by the various formation thicknesses and burial depth.With a little oil type gas,coal type gas is the main terrestrial gas in this area.Differences exist in the content,distribution,cause and source of oil type gas in diverse areas.Only a few oil type gases exist in T₃x₂ of west Sichuan Basin which is from the petroleum cracking of Maantang Formation-Xiaotangzi Formation.Oil type gas,coming from the kerogen cracking of Jurassic,is the dominant natural gas of Jurassic in central Sichuan.Some oil type gas (from the petroleum cracking),mainly deriving from the underlying gas reservoir,exists in Xujiahe Formation of south Sichuan Basin.The migration of the natural gas of the Upper Triassic in Sichuan Basin occurs in water dissolving phase and separate phase while the Jurassic in Sichuan Basin mainly occurs in separate phase.

Key words： Origin of natural gas; Migration phase; Gas and source rock; Continental gas; Sichuan Basin

Cite this article

WANG Peng，SHEN Zhong-min，LIU Si-bing，L Zheng-xiang，FENG Jie-rui，WANG Jun-ze . The Geochemical Characteristics and Comparison of the Terrestrial Natural Gas in Sichuan Basin[J]. Natural Gas Geoscience, 2013 , 24(6) : 1186 -1195 . DOI: 10.11764/j.issn.1672-1926.2013.06.1186

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