Oil & Gas Geology ›› 2020, Vol. 41 ›› Issue (4): 755-762.doi: 10.11743/ogg20200409

• Petroleum Geology • Previous Articles     Next Articles

Geochemical characteristics of noble gases in natural gases from the Tarim Basin

Daxiang He1,2,3(), Youjun Tang1,2, Jinjie Hu1,2, Shaowu Mo1,2, Jianfa Chen3,*()   

  1. 1. Key Laboratory of Oil and Gas Resources and Exploration Technology(Yangtze University), Ministry of Education, Wuhan, Hubei 430100, China
    2. College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China
    3. State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2018-12-21 Online:2020-08-01 Published:2020-08-11
  • Contact: Jianfa Chen E-mail:hedaxiang127@163.com;jfchen@cup.edu.cn

Abstract:

The isotopic characteristics of noble gases have been long used in the study of the genesis and origin of natural gases.A systematic analysis of the abundance and isotopic composition of noble gases in natural gases from different structural units shows that the majority of samples is low in the ratio of 3He/4He, with the R/Ra values generally less than 0.1, indicating a crustal radiogenic genesis of the noble gases and a significant "cold" feature of the basin.No simple correlation exists between the 3He/4He ratios and both of heat flow and paleo-geothermal gradient, revealing little heat sourcing from mantle.The lower level of 21Ne/22Ne ratios influenced by the relatively late hydrocarbon generation and accumulation period, mostly during the Himalaya movement, shows an inconspicuous proportion of mantle-derived gas in natural gases from Kuqa Depression.The relative depletion of 129Xe shows that the mixing of mantle-derived volatile constituents is insignificant.Furthermore, compared with the natural gases from Tabei Uplift and Tazhong Uplift, the Xe in natural gases from Kuqa Depression was more likely derived from the crust due to the influences of lithology and structural features.

Key words: mantle-derived, terrestrial heat flow, isotope, noble gas, natural gas, Kuqa Depression, Tarim Basin

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