Abstract
Based on 13 published porewater H 2S and sulphate profiles the amount of H 2S escaping from non-bioturbated shales varies between some few % to 45% of the amount of bacterially generated H 2S. This finding permits calculation of the original organic carbon (TOC or) content of immature nonbioturbated shales using TOC and sulphur content data. In two immature non-bioturbated sequences from Hungary (Toarcian and Oligocene) the first-order correlation between HI and TOC/TOC or was found to be stronger than that between HI and TOC, indicating that sulphate reduction was the leading process both in decrease in TOC content and degradation of kerogen source potential.
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