Previously for the studied shale samples, Hazra et al. (2015) had tried to estimate their original hydrocarbon generative potential (S2O) prior to expulsion due to maturity, original HI (HIO), original TOC (TOCO) and the fraction of conversion (f) that the kerogen within the samples have undergone (following Peters et al., 2005 and Jarvie et al., 2007)