Measurement technology for content and isotopic compositions of noble gases in reservoir rocks

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  • 1.Wuxi Institute of Petroleum Geology,Exploration and Production Research Institute,SINOPEC,Wuxi 214151,China;
    2.SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms,Wuxi 214151,China

Received date: 2015-07-14

  Revised date: 2015-09-21

  Online published: 2019-09-20

Abstract

With connecting self-designed Vacuum-Ball mill device,noble gas purification and concentrating system,Quadrupole Mass Spectrometer and noble gas isotope mass spectrometer,we can extract,purify,concentrate gases from reservoir rocks.And the content and isotopic compositions of total noble gases in reservoir rocks are successfully measured.In blank test,the dynamic vacuum pressure and static rate of leak all meet the demands.When the self-designed Vacuum-Ball mill device runs for 10 mins,the background’s pressure is 1.0×10-1Pa,the intensity of mass 40Ar is1.3×10-10A,sample gases are not affected.The contents and isotopic compositions of total noble gases were measured from Ordovician rocks of drilling cores in Tahe Oilfield,compared with He,Ar contents and isotopic compositions from the same area’s natural gases.The results show perfect compatibility of the contents and isotopic compositions of He,Ar between reservoir rocks and natural gases.Noble gases indicator can also be used for accumulation dating.Relative activity for regional structure is divided by 3He/4He in reservoir rocks,and 40Ar/36Ar is effective indicator for estimating gas-source rock time.So for the interval with absence of natural gas samples,it can be replaced by reservoir rocks accordingly.

Cite this article

Yang Hua-min, Wang Jie, Tao Cheng, Liu Wen-hui . Measurement technology for content and isotopic compositions of noble gases in reservoir rocks[J]. Natural Gas Geoscience, 2016 , 27(4) : 681 -687 . DOI: 10.11764/j.issn.1672-1926.2016.04.0681

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