As we can clearly see, PAMPA data are located in the range of values (approx. from -8 to 4 log units), but the PerMM method is in the wider range of values (approx. from -16 to 4). Differences between the logPerm values from PerMM and PAMPA can be huge (several log units), although the PerMM method was successfully evaluated by PAMPA-DS (PAMPA-DS: R 2 = 0.75, RMSE = 1.59 log unit) by Lomize et al. . Our correlation is weaker (R 2 = 0.27) than Lomize's because our dataset contains apparent permeabilities and intrinsic permeabilities, whereas Lomize used only intrinsic permeabilities from one source.