Figure 8.
Concentrations of ethyladamantane isomers 1-ethyladamantane (1-EA), 1-ethyl-3-methyladamantane (1-E-3-MA), 1-ethyl-3,5-dimethyladamantane (1-E-3,5-DMA), and 1-ethyl-3,5,7-trimethyladamantane (1-E-3,5,7-TMA) shown versus thermal maturity for all fluids. Solid black lines represent linear fits to all data (excluding the outlier sample from the Middle East [ME]-2 group in green), with 95% confidence intervals of the fits in gray shading. EU = Europe; NA = North America; = adjusted coefficient of determination; SA = South America; VRE = vitrinite reflectance equivalent.