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Natural gas in the recently discovered Lower Cambrian Longwangmiao giant gas reservoir of the Sichuan Basin in southwestern China has been considered to be from oil-cracking and sourced from the underlying Lower Cambrian Qiongzhusi shales, similar to the underlying Neoproterozoic Dengying giant gas reservoir. However, geological considerations and differences in geochemistry between the Longwangmiao...
Linear covariations between stable isotopic compositions of methane, ethane and propane have long been observed in natural gas accumulations; e.g., a plot of δ13Cpropane versus δ13Cethane of natural gas fall along a straight line. This work investigates physicochemical mechanisms behind the correlations and derives the theoretical slope value for each correlation line. Most slopes are close to the...
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