Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8910769 | Geochimica et Cosmochimica Acta | 2018 | 31 Pages |
Abstract
Irradiation has induced changes in organic matter composition throughout the shale's entire ca. 500â¯Ma history, irrespective of thermal history. This factor has to be taken into account when reconstructing petroleum generation history. The Alum Shale's kerogen underwent catagenesis in the main petroleum kitchen area 420-340â¯Maâ¯bp. Our calculations suggest the kerogen was much more aliphatic and oil-prone after deposition than that after extensive exposure to radiation. In addition, the gas sorption capacity of the organic matter in the Alum Shale can be assumed to have been less developed during Palaeozoic times, in contrast to results gained by sorption experiments performed at the present day, for the same reason. The kerogen reconstruction method developed here precludes overestimations of gas generation and gas retention in the Alum Shale by taking irradiation exposure into account and can thus significantly mitigate charge risk when applied in the explorations for both conventional and unconventional hydrocarbons.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Shengyu Yang, Hans-Martin Schulz, Brian Horsfield, Niels H. Schovsbo, Mareike Noah, Elena Panova, Heike Rothe, Knut Hahne,