Fig. 3: Δ12CH2D2 versus Δ13CH3D of the measured Olla and Nebo-Hemphill samples.
From: Rapid microbial methanogenesis during CO2 storage in hydrocarbon reservoirs
The clumped isotopologue space illustrates whether measured CH4 is at internal thermodynamic equilibrium (black line) or not. The thermodynamic equilibrium curve is calculated following ref. 41. The shaded cross represents thermal equilibration to current reservoir temperatures in each isotopologue. The arrows represent the theoretical trends for methanogenesis (dark grey) and AOM (light grey) 29. The 1σ level of uncertainty is shown on the measured samples.
