Early porosity generation in organic-sulfur-rich mudstones.

Except for S1 (free hydrocarbon) that is subject to evaporative loss (e.g., 45 ) during sample handling and preparation, the other parameters show a clear trend with increasing thermal maturity during artificial maturation (Table 2 ).

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Compaction is not relevant to our samples as they were artificially matured without overburden load, but occlusion may be significant, particularly by oil and bitumen (i.e., migrabitumen sensu 42 ), which can then be transformed into solid bitumen or pyrobitumen 14 , 16 , 19 – 21 , 23 , 53 across a wide thermal maturity range 54 – 56 (among others).

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