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Theses

Mécanismes de formation et évolution des pyrobitumes dans les réservoirs pétroliers : cas naturels et approches expérimentales.

Abstract : The thermal degradation of hydrocarbons in petroleum reservoirs leads to formation of gas and
an insoluble, carbon-rich residue known as pyrobitumen, whose presence is severely detrimental
to the poro-perm qualities of the reservoir.
This thesis presents the parallel study of a series of naturally occurring reservoir bitumens from
Angola and Abu Dhabi, and an experimental study of artificial maturation of both immature
solid bitumen and crude oil by closed system pyrolysis.
Results indicate that pyrobitumen formation is strongly dependent on the composition of the oil
precursor. Specifically, NSO content appears to exhibit a strong control on the temperature
threshold for formation, and the quantity of pyrobitumen. There appear to be at least two
mechanisms for pyrobitumen formation. Normal oils undergo cracking and condensation
reactions, leading to small amounts of graphitising, refractive pyrobitumen. However, NSO-rich
oils tend to undergo polymerisation to solidify prematurely.
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Theses
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https://tel.archives-ouvertes.fr/tel-00107398
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, October 18, 2006 - 3:21:11 PM
Last modification on : Thursday, March 5, 2020 - 6:48:49 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 8:04:55 PM

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  • HAL Id : tel-00107398, version 1

Citation

Andrew Mort. Mécanismes de formation et évolution des pyrobitumes dans les réservoirs pétroliers : cas naturels et approches expérimentales.. Géochimie. Université d'Orléans, 2004. Français. ⟨tel-00107398⟩

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