Mechanism of linear covariations between isotopic compositions of natural gaseous hydrocarbons

摘要

Highlights?Theoretical trends are derived for natural gas data on isotope plots.?Slopes of the trends are close to calculated statistical distributions.?Deviation from the statistical distribution is calculated using kinetics.?Generation of methane may have different paths than that of ethane and propane.?Analysis in this work helps to understand intramolecular isotopic compositions.?Kinetic analysis helps to understand the clumped isotopic composition of methane.AbstractLinear covariations between stable isotopic compositions of methane, ethane and propane have long been observed in natural gas accumulations; e.g., a plot of δ13Cpropaneversus δ展开▼