Geochemical characteristics and origin of natural gas in Dongping-Niudong areas,Qaidam Basin,China

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  • 1.Research Institute of Exploration and Development,Qinghai Oilfield Company,PetroChina,Dunhuang 736202,China;
    2.Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China;
    3.Chengxin Services Company,Qinghai Oilfield Company,PetroChina,Dunhuang 736202,China

Received date: 2015-10-21

  Revised date: 2016-01-15

  Online published: 2019-09-19

Abstract

The geochemical characteristics,origin and source of natural gas in Dongping-Niudong areas are researched based on the information of components and stable carbon isotopes of natural gas.The main component of hydrocarbon gas is methane,and C2+ possesses relatively low content,ranging from 0.5% to 6.5%.The dryness coefficient of Dongping area is more than 0.97,belonging to dry gas.The dryness coefficient of Niudong area ranged from 0.90 to 0.98,having the characteristics of dry gas coexisting with wet gas.δ13C1 varies from -17.58‰ to -36.4‰,and δ13C2 is greater than -29‰.The gas of Dongping 3 block have the characteristics of abiogenic gas,such as reversed carbon isotope series.Combined with the relationship between the component of CO2 and δδ13CCO2 and the background of development of hydrocarbon-generating sag,it suggests that it is coal-derived gas.The RO and fluid inclusion studies show that the gas in Niudong area is mainly derived from Early Jurassic coal-measure source rocks in Kunteyi Sag,and there are two periods of hydrocarbon fillings.The first filling is mainly oil,and the second is mainly high mature gas;gas in Dongping area is mainly derived from Early Jurassic coal-measure source rocks of Pingdong and Yiliping Sags,and there are four periods of high-over mature gas fillings.The phenomenon of reversed carbon isotope series in Dongping area resulted from the multiple gas charging.

Cite this article

Zhou Fei, Zhang Yong-shu, Wang Cai-xia, Sui Guo-jie, Wang Bo, Zhang Ji-hong, Zhang Jian-jie, Wu Zhi-xiong . Geochemical characteristics and origin of natural gas in Dongping-Niudong areas,Qaidam Basin,China[J]. Natural Gas Geoscience, 2016 , 27(7) : 1312 -1323 . DOI: 10.11764/j.issn.1672-1926.2016.07.1312

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