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1 Distribution of Samples and the Measured Results Natural gases from 252 industrial gas wells of 16 oil-gas-bearing regions in China have been sampled in the past ten years.The samples were stored in 1 L double-valve, high-pressure cylinders.~3He/~4He value of the samples was analysed on a VG-5400
1 Distribution of Samples and the Measured Results Natural gases from 252 industrial gas wells of 16 oil-gas-bearing regions in China have been sampled in the past ten years. The samples were stored in 1 L double-valve, high-pressure cylinders. ~ 3He / ~ 4He value of the samples was analyzed on a VG-5400