Bacteria effects on geochemical characteristics of natural gas:A case study in the Shinan Oil-Gasfield,central Junggar Basin

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  • 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

Received date: 2016-05-09

  Revised date: 2016-08-29

  Online published: 2019-09-06

Abstract

Five different types of natural gas were identified in the Shinan Oil-Gasfield,central Junggar Basin.The first type is original thermal gas derived from humic source rocks in the Middle Permian Wuerhe Formation and accounts for the main body of Shinan natural gas.The second type is mixed with a small amount of biotic gas including Ji001,Ji003,Shinan4 and Shinan5 which was resulted from the biodegradation of primary oil accumulation.Selective biodegradation on propane occurred in the third type whose carbon isotope of propane is 9.6‰ more positive than that of butane.Selective biodegradation on ethane occurred in the fourth type whose carbon isotope of ethane is more positive than that of propane.The fifth type is derived from sapropelic source rocks in the Lower Permian Fengcheng Formation with its methane being selectively biodegraded.Considering the present burial depth of biodegraded samples,two stages of bacteria process may occur in the study area.

Cite this article

Wei Yan-zhao, Gong De-yu, Wang Feng, Wu Ai-cheng, Sun Jing, Fang Chen-chen, Liu Gang, Chen Gang . Bacteria effects on geochemical characteristics of natural gas:A case study in the Shinan Oil-Gasfield,central Junggar Basin[J]. Natural Gas Geoscience, 2016 , 27(12) : 2176 -2184 . DOI: 10.11764/j.issn.1672-1926.2016.12.2176

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