A Comparison between Shale Gas and Conventional Gas on Geochemical Characteristics in Weiyuan Area

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  • PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China

Received date: 2013-12-22

  Revised date: 2014-03-21

  Online published: 2019-09-18

Abstract

Being a large and old conventional gas field,Weiyuan area becomes one of the earliest shale gas exploration and development experimental areas in China.Geochemical parameters of 8 gas samples from Longmaxi shale and Qiongzhusi shale in 5 wells were analyzed in this study,which were also compared with the conventional gas in this area.The alkane accounts for absolute advantages in the molecular compositions of shale gas,as high as 98.47% without any H2S.The gas is very dry and methane accounts for 98.01% in an average.The carbon and hydrogen isotopes are similar to the high or over mature shale gases in North America,which is characterized by isotopic reversal.Through comparison between shale gas and conventional gas on geochemical characteristics,6 kinds of differences are identified and analyzed: (1)The conventional gas has H2S; (2)Conventional gas has more non-hydrocarbon gases such as CO2 and N2; (3)The conventional CO2 is of both biogenic and abiogenic origin,but the CO2 in shale gas is derived from the carbonates; (4)The conventional gas has lower wetness and heavier carbon isotopes; (5)The carbon and hydrogen isotopes are reversed for shale gas,but the isotopic order is normal in Sinian reservoir and reversed in Permian for the conventional gases; (6) δ13Cvaries widely in different formations,and it is abnormally light in shale gas. Degassed water-soluble gases,TSR, the migration ability of N2 and preservation conditions for early gas are main factors to make the differences. High maturity and mixing effects in relatively closed system are the main cause for the isotope reversal.

Cite this article

WU Wei, HUANG Shi-peng, HU Guo-yi, GONG De-yu . A Comparison between Shale Gas and Conventional Gas on Geochemical Characteristics in Weiyuan Area[J]. Natural Gas Geoscience, 2014 , 25(12) : 1994 -2002 . DOI: 10.11764/j.issn.1672-1926.2014.12.1994

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