Caractérisation sédimentaire de la formation roche mère carbonatée Parnac du Kimméridgien supérieur du Bassin d'Aquitaine (Quercy)

Translated title of the contribution: Sedimentary characterization of the carbonate source rock of Upper Kimmeridgian Parnac Formation of the Aquitaine Basin (Quercy area)

L Bastianini, Bruno Caline, Guilhem Hoareau, Cédric Bonnel, Mathieu Martinez, Carine Lézin, François Baudin, Alexander Brasier, Laurent Guy

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Abstract

The main source rock (SR) of the Aquitaine Basin, the most important oil province in France, corresponds to organic-rich marine limestones of Upper Kimmeridgian age (Lons Formation in the Béarn area and Parnac Formation in the Quercy area). In order to better characterize their depositional environment, in particular the conditions of accumulation and preservation of organic-matter, a sedimentological, micropaleontological and geochemical study of the Crayssac section (Quercy) has been performed. Organic-rich sediments are argillaceous limestones (65 to 99% CaCO3) organized in repetitive beds of up to 1-m thickness. Their total organic matter content reaches up to 15 wt.%, and in this SR kerogen is type of II and immature. Microfauna content, the lack of barrier facies and the control of the wave action base over the depositional environments reflect deposition in an open marine type homoclinal ramp. Strong similarities with Kimmeridgian organic-rich limestones of the Middle East (Hanifa Formation) suggest that the Parnac Formation could act as an analogue of this prolific SR.
Original languageFrench
Article number32
Pages (from-to)1-16
Number of pages16
JournalBulletin de la Socie´te´ Ge´ologique de France
Volume188
Issue number5
Early online date15 Nov 2017
DOIs
Publication statusPublished - 2017

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Keywords

  • Aquitaine Basin
  • source rock
  • upper Kimmeridgian
  • Parnac Formation
  • carbonates
  • organic matter
  • Bassin d’Aquitaine
  • roche mère
  • Kimméridgien supérieur
  • Formation de Parnac
  • matière organique

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