Fig. 5: Gas conversion and pressure change in mesocosms.
From: Hydrogen storage and geo-methanation in a depleted underground hydrocarbon reservoir
a, Normalized pressure progression in M3 (pbio, blue line, n = 14) and across abiotic control mesocosms M4 and M5 (pabio, grey line, n = 3 and n = 7, respectively). Data are presented as mean values ± SD. Gaussian fit (latent function) of net pressure loss of 14 conversion cycles performed in M3 (pnet, orange line, n per cycle = 481). The vertical dashed line denotes the intercept between the latent function and the benchmark of 95% of maximum theoretical pressure loss possible via geo-methanation (horizontal dashed line); t95 represents the average time to complete the geo-methanation cycle with a benchmark of 95% maximum pressure loss. pt: mesocosm pressure at time point t; p0: initial mesocosm pressure. b, Linear regression of net pressure difference (Δp) and maximum conversion rate (CRmax) of 14 conversion cycles in M3. Red dotted lines show 95% confidence intervals of the regression line.
