Stable Carbon and Hydrogen Isotopes of Natural Gas from the Zhongba Gasfield in the Sichuan Basin and Implication for Gas-source Correlation

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

Received date: 2013-09-27

  Revised date: 2013-12-16

  Online published: 2014-01-10

Abstract

Carbon and hydrogen isotopes of natural gas are the most direct and effective tools to distinguish gases origins.There are two main natural gas pay zones in the Zhongba Gasfield,Member 2 of the Upper Triassic Xujiahe Formation (T3x2 ) and Member 3 of the Middle Triassic Leikoupo Formation (T2l3 ) of which the gas source remains controversial.In this paper,we measured the carbon and hydrogen isotopes of natural gas as well as carbon isotopes of light hydrocarbons and condensates from the T3x2 and the  T2l3 gas producers in the Zhongba Gasfield.In order to comparison,we also analyzed the hydrogen isotopes of gases from other gas producers in the Sichuan Basin.The results show that gases from theT3x2   are sourced from the Xujiahe Formation coals while gases from the T2l3 are sourced from the Permian sapropelic carbonates in consideration of the distribution of source rocks in this area.

Cite this article

LIAO Feng-rong,YU Cong,WU Wei,LIU Dan . Stable Carbon and Hydrogen Isotopes of Natural Gas from the Zhongba Gasfield in the Sichuan Basin and Implication for Gas-source Correlation[J]. Natural Gas Geoscience, 2014 , 25(1) : 79 -86 . DOI: 10.11764/j.issn.1672-1926.2014.01.79

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