Geochemical features of shale gas and their genesisin Jiaoshiba block of Fuling Shale Gasfield,Chongqing

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  • (SINOPEC Exploration Company,Chengdu 610041,China)

Received date: 2015-06-11

  Revised date: 2015-09-29

  Online published: 2016-03-10

Abstract

Taking natural gas from marine strata of Wufeng-Longmaxi Formations in Jiaoshiba block of Fuling Shale Gasfield as a research object and based on the analyses of gradients of shale gas and carbon isotope,it is found that the natural gas from Jiaoshiba area belongs to high quality hydrocarbon gas.The contents of methane is 97.22%-98.41%,with little amount of ethane and propane,average wetness of 0.74%,little amount of non-hydrocarbons such as CO2,N2 and H2,and no H2S.Carbon isotopes of methane,ethane and propane characterized by complete isotopic reversal,i.e.,δ13C113C213C3.The natural gas from Wufeng-Longmaxi Formtions comes from source rocks of Wufeng-Longmaxi Formations,belonging to typical shale gas.According to the statistical determination criterion,natural gas in the Jiaoshiba area is derived from the sapropelic source rocks,which is a result of high temperature pyrolysis.It is a mixing product of primary kerogen pyrolysis and secondary pyrolysis of crude oil,with obvious features of secondary pyrolysis of oil. The reason for complete carbon isotopic reversal is the mixing of the two above gases.Moreover,it has some relationships with loss function of shale gas after Late Yanshan.

Cite this article

Wei Xiang-feng,Guo Tong-Lou,Liu Ruo-bing . Geochemical features of shale gas and their genesisin Jiaoshiba block of Fuling Shale Gasfield,Chongqing[J]. Natural Gas Geoscience, 2016 , 27(3) : 539 -548 . DOI: 10.11764/j.issn.1672-1926.2016.03.0539

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