Sedimentary characterization of the carbonate source rock of upper kimmeridgian parnac formation of the aquitaine basin (Quercy area)
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.
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BibTeX
@article{bastianini2026sedimentary,
title = {{Sedimentary characterization of the carbonate source rock of upper kimmeridgian parnac formation of the aquitaine basin (Quercy area)}},
author = {Laura Bastianini and Bruno Caline and Guilhem Hoareau and Cédric Bonnel and Mathieu Martinez and Carine Lézin and François Baudin and Alexander Brasier and Laurent Guy},
journal = {Bulletin de la Société Géologique de France},
year = {2026},
month = nov,
doi = {10.1051/bsgf/2017197},
url = {https://hal.science/hal-01803236v2},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Sedimentary characterization of the carbonate source rock of upper kimmeridgian parnac formation of the aquitaine basin (Quercy area)
AU - Laura Bastianini
AU - Bruno Caline
AU - Guilhem Hoareau
AU - Cédric Bonnel
AU - Mathieu Martinez
AU - Carine Lézin
AU - François Baudin
AU - Alexander Brasier
AU - Laurent Guy
PY - 2026
DA - 2026/11/03
JO - Bulletin de la Société Géologique de France
DO - 10.1051/bsgf/2017197
UR - https://hal.science/hal-01803236v2
AB - 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.
SN - 0037-9409
SN - 1777-5817
ER -